European Journal of Taxonomy 169: 1—46

http://dx.doi.org/10.5852/ejt.2015.169

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2015 • Huber B.A. & Nuneza O.M.

Research article

um:lsid:zoobank.org:pub:BB0E51AB-C0E6-4054-AFED-939D14BDlEFB

Evolution of genital asymmetry, exaggerated eye stalks, and extreme

palpal elongation in Panjange spiders (Araneae: Pholcidae)

Bernhard A. HUBER 1 * & Olga M. NUNEZA 2

Alexander Koenig Research Museum of Zoology, Adenauerallee 160, 53113 Bonn, Germany.

2 Department of Biological Sciences, Mindanao State University - Iligan Institute of Technology,

Tibanga, Iligan City 9200, Philippines.

* Corresponding author: [email protected]

2 Email: [email protected]

1 um:lsid:zoobank.org:author:33607F65-19BF-4DC9-94FD-4BB88CED455F

2 um:lsid:zoobank.org:author:6D14FCCC-F148-4293-9F23-0EB5A4119305

Abstract. We describe several new species of the previously monotypic Panjange lanthana species

group from the Philippines and document their extraordinary morphology. Some species show strong

male genital asymmetry, a phenomenon that seems to be exceedingly rare in spiders. Males of most

species have eye stalks, and in two species these eye stalks are among the longest ever recorded in

spiders. Some species show a tendency for male genital (pedipalp) elongation, and one species has the

longest and thinnest palps ever recorded in Pholcidae. A cladistic analysis is performed including all

described and several undescribed species of Panjange (except for one “problem species”), supporting

the lanthana group and its close relationship with members of the possibly paraphyletic cavicola group.

The following eight new species are described: Panjange malagos Huber sp. nov.; Pa. casaroro Huber

sp. nov.; Pa. camiguin Huber sp. nov.; Pa. hamiguitan Huber sp. nov.; Pa. isarog Huber sp. nov.; Pa.

dinagat Huber sp. nov.; Pa. marilog Huber sp. nov.; Pa. bukidnon Huber sp. nov.

Key words. Genital asymmetry, eye stalks, palpal elongation, sexual selection, Panjange , Philippines.

Huber B.A. & Nuneza O.M. 2015. Evolution of genital asymmetry, exaggerated eye stalks, and extreme palpal

elongation in Panjange spiders (Araneae: Pholcidae). European Journal of Taxonomy 169: 1-46. http://dx.doi.

org/10.5852/eit.2015.169

Introduction

Panjange Deeleman-Reinhold & Deeleman, 1983 spiders are leaf-dwelling pholcids widely distributed

in insular Southeast Asia, from Borneo and the Philippines to northern Australia (Huber 2011). They

exhibit some of the most extraordinary morphology among Pholcidae. Males of most species have

eye stalks, sometimes with long pointed processes; males of some species have unusually elongated

pedipalps, which in spiders function as copulatory organs; and females of some species have external

portions of their genitalia strongly folded and extensible (Huber 2011). The biological significances of

these sexual modifications remain unclear.

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European Journal of Taxonomy 169 : 1-46 ( 2015 )

The genus has long been divided into three species groups: the nigrifrons group on Borneo, the

cavicola group ranging from Sulawesi to northern Australia, and the lanthana group in the Philippines

(Deeleman-Reinhold & Platnick 1986; Huber 2011). However, the latter “group” so far consisted of

only one species, the very unique type species Panjange lanthana Deeleman-Reinhold & Deeleman,

1983, known only from the type series from Luzon. No further Panjange species has been known from

the Philippines. Here we describe several new species that appear closely related to Pa. lanthana , and

that show some very unique morphological features, not only among Pholcidae but among spiders in

general: genital asymmetry, exaggerated eye stalks, and extreme palpal elongation.

Genital asymmetry is very common in some arthropod groups (such as insects) but very rare in others

(such as spiders) (reviewed in Huber et al. 2007). Ultimately, the reason for this may be the fact that

insects have an unpaired median intromittent organ (the aedeagus) while spider males copulate with a

pair of pedipalps (Huber 2010). However, while there are plausible evolutionary routes to asymmetry in

insects (related to changes in mating position that in turn are driven by sexual selection; Huber 2010),

the origin of spider genital asymmetry is still poorly understood. Two of the new species described

below are among the most asymmetric spiders known so far.

Eye stalks are also widespread in arthropods such as crustaceans (e.g., Barnes 1968; Bowman 1984; Zeil

et al. 1986) and insects (in particular flies: e.g., Burkhardt & de la Motte 1988; Wilkinson & Dodson

1997; Baker & Wilkinson 2001), but very rare in arachnids. Fairly well studied exceptions are certain

linyphiid species where the male “head” or ocular area is modified, presumably as a result of sexual

selection: males take advantage of the fact that the female mouthparts contact their ocular region during

copulation and modify this region in an attempt to manipulate females (e.g., Schaible et al. 1986;

Vanacker et al. 2003; Kunz et al. 2012). Usually, these modifications come in the form of low humps or

turrets, but rarefy also as (unpaired median) stalks, such as in Walckenaeria acuminata Blackwall, 1833.

In Pholcidae, a similar mating position may explain the repeated origin of male “head” modifications,

such as in the genera Modisimus Simon, 1893, Smeringopina Kraus, 1957, Pholcus Walckenaer, 1805,

Leptopholcus Simon, 1893, and Panjange (see e.g., Huber 1997a, 2011, 2013). Two of the new species

described below have the longest eye stalks known in Pholcidae, and possibly in spiders.

Elongated male copulatory organs (pedipalps) occur in various spider groups, but the palps are rarefy

longer than the body (exceptions occur for example in Filistatidae; Marusik & Zamani 2015). The

significance of this elongation is poorly understood, and the plausible idea that long palps may save the

male from cannibalism has to our knowledge never been tested. In Pholcidae, palpal strength seems to

play an important role, often leading to very thick palpal segments (Huber & Eberhard 1997). As a result,

elongated (and thus necessarily thin) palps are rare in pholcids, and apparently limited to Southeast

Asian leaf dwelling species. The only cases known to us occur in the genera Calapnita Simon, 1892

(most notably C. semengoh Huber, 2011), in most species of the Panjange cavicola group (Huber 2011)

and in certain species currently placed in Pholcus but possibly close to Panjange (such as Pholcus

bohorok Huber, 2011). In all of them, females have extensible external genitalia (or scapes), suggesting

a functional correlation between palp length and scape length. A new species described below has by far

the longest and thinnest male palps known in Pholcidae, as well as the longest female scape.

Material and methods

Most of the material studied herein was collected during a recent expedition to the Philippines (Feb-

Mar. 2014). Further specimens came from student projects at Mindanao State University - Iligan

Institute of Technology dealing with ecological aspects of pholcid diversity in the Philippines. The

material is currently deposited at Zoologisches Forschungsmuseum Alexander Koenig, Bonn (ZFMK)

and Mindanao State University - Iligan Institute of Technology (MSU-IIT).

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HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Species descriptions are arranged as in the cladogram in Fig. 1. Methods and terminology are as in recent

revisions (Huber 2011, 2013). Measurements are in mm unless otherwise noted. Eye measurements are

+/- 5 pm. Epigyna were cleared in warm NaOH solution and stained with chlorazol black. For SEM

photographs, specimens were dried in HMDS (Brown 1993), and photographed with a Hitachi S-2460

scanning electron microscope. SEM data are presented within the descriptions but are not based on the

holotype specimens described. The distribution map was generated with ArcMap 10.0.

The numerical cladistic analyses were done using NONA, version 2 (Goloboff 1993), Pee-Wee,

version 2.8 (Goloboff 1997) and TNT, version 1.1 (Goloboff et al. 2004, 2008). The matrix is shown

in Appendix 1; terminal taxa and characters scored are given in Appendices 2 and 3. All 26 characters

are binary. The final matrix can be downloaded at http://www.pholcidae.de/matrices.html [accessed 21

Nov. 2015]. Cladogram analysis was done with Winclada, version 1.00.08 (Nixon 2002). See “Cladistic

analysis” section below for details of the analyses.

Abbreviations

The following abbreviations are used in the text:

ALE = anterior lateral eyes

ALS = anterior lateral spinnerets

AME = anterior median eyes

a.s.l. = above sea level

L/d = length/diameter

PME = posterior median eyes

PMS = posterior median spinnerets

In order to avoid confusion, Panjange is abbreviated as “ Pa” ; Pholcns is never abbreviated. Further

abbreviations used only in figures are explained directly in the figure legends.

Results

Class Arachnida Cuvier, 1812

Order Araneae Clerck, 1757

Family Pholcidae C.L. Koch, 1851

Genus Panjange Deeleman-Reinhold & Deeleman, 1983

Panjange Deeleman-Reinhold & Deeleman, 1983: 123-124. Type species by original designation:

Panjange lanthana Deeleman-Reinhold & Deeleman, 1983.

Panjange - Deeleman-Reinhold 1986a: 47, fig. 6; 1986b: 220.—Huber 2001: 118-119; 2011: 108-110.

Note on species groups

Previous work on Panjange has identified three species groups, the nigrifrons group on Borneo, the

widespread cavicola group (Sulawesi to northern Australia) and the previously monotypic lanthana

group on the Philippines (Deeleman-Reinhold & Platnick 1986; Huber 2011). The present cladistic

analysis largely recovers these three groups, but the cavicola group is considered paraphyletic (Fig. 1).

The present paper focuses on the lanthana group A separate paper on the nigrifrons group is in

preparation, as is a molecular phylogeny of the entire genus and of its relationships to other Pholcinae.

Identification key

This key is primarily designed to identify species groups of Panjange and species of the lanthana group.

It mostly works for males and females, but females remain difficult to identify. An examination of the

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European Journal of Taxonomy 169 : 1-46 ( 2015 )

cleared internal genitalia may be necessary (step 7); geography rather than morphology may help to

separate females (step 2); in one species, the female is unknown (Pa. bukidnon Huber sp. nov.; step 4).

1. Male chelicerae with distal frontal apophyses (fig. 472 in Huber 2011); female epigynal scape short

or absent (figs 473, 492 in Huber 2011); known only from Borneo. nigrifrons group

- Male chelicerae without distal frontal apophyses, only with pair of proximal processes (e.g.. Figs 17,

40, 66); epigynal scape long and strongly folded (e.g., Figs 22, 36, 67).2

2. Embolus parallel to male bulbal process (appendix); known from Sulawesi to Australia.

. cavicola group

- Embolus and bulbal appendix pointing in opposite directions (e.g., Figs 18, 64, 69); known from the

Philippines only. lanthana group...3

3. Eight eyes (AME present; lenses clearly visible in dissecting microscope); without pointed processes

arising from male eye triads (fig. 441 in Huber 2011); procursus with two distal hinged processes

(figs 436, 437 in Huber 2011). Pa. lanthana Deeleman-Reinhold & Deeleman, 1983

- Six eyes (AME absent; rarely tiny, barely visible in dissecting microscope and apparently non¬

functional: Fig. 45), with pointed processes arising from male eye triads (e.g., Figs 17, 28, 66, 76);

procursus with only one distal hinged process.4

4. Procursus extremely wide and strongly curved (Fig. 91); eye stalks short, with spines contacting

each other (Fig. 90); bulbal processes (embolus and appendix) very short (Fig. 91).

. Pa. bukidnon Huber sp. nov.

- Procursus, male ocular area, and bulbal processes different.5

5. Male palpal segments (distal of trochanter) extremely long (femur about 15 x as long as wide;

Figs 64, 65); female epigynal scape extremely long (Fig. 67). Pa. hamiguitan Huber sp. nov.

- Male palpal segments shorter (femur less than 7 x as long as wide; e.g., Figs 19, 25, 39); female

epigynal scape shorter (e.g., Figs 22, 29, 72).6

6. Male clypeus without spines; dorsal tarsal elongation very long (Figs 18, 24); male procursus

asymmetric; female epigynal scape directed toward posterior.7

- Male clypeus with spines (Figs 71, 76, 81); dorsal tarsal elongation short (Figs 70, 75, 80); male

procursus symmetric; female epigynal scape directed toward anterior (Figs 72, 77, 82).9

7. Male eye stalks short (Fig. 17); spines on male eye stalks short, not contacting each other; pore

plates round (Fig. 23). Pa. malagos Huber sp. nov.

- Male eye stalks very long (Figs 28, 35); spines on male eye stalks long, contacting each other (Fig. 49);

pore plates oval (Figs 30, 37).8

8. Male palpal trochanter with only one long retrolateral apophysis (Fig. 25); male palpal tarsal

elongation widening distally (Fig. 24); female epigynal scape with two lobes (Fig. 29).

. Pa. casaroro Huber sp. nov.

- Male palpal trochanter with two short retrolateral apophyses (Fig. 39); male palpal tarsal elongation not

widening distally (Fig. 38); female epigynal scape simple (Fig. 36). Pa. camiguin Huber sp. nov.

9. Appendix of genital bulb with simple curved tip (Fig. 69); male palpal retrolatero-ventral trochanter

apophysis with simple rounded tip (Fig. 70); female epigynal scape without widening (Fig. 72).

. Pa. isarog Huber sp. nov.

- Appendix of genital bulb with bifid tip (Figs 74, 79); male palpal retrolatero-ventral trochanter

apophysis bifid (Figs 75, 80); female epigynal scape with widening (Figs 77, 82). 10

4

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

10. Retrolateral process on procursus massive, with parallel ridges (Fig. 75); female internal genitalia

with large lateral structures and elongate pore plates (Fig. 78). Pa. dinagat Huber sp. nov.

- Retrolateral process on procursus smaller, with two pointed tips (Fig. 80); female internal genitalia

without large lateral structures and roundish pore plates (Fig. 83). Pa. marilog Huber sp. nov.

■ Quamtana sp.

— Pholcus phalangioides

— Pholcus debilis

7 11 20

-O-O-O— Pholcus phui

1 1 1

— Pholcus diopsis

— Pholcus atrigularis

— Pholcus minang

11

1

12

1

Pa. Bor 96

Pa. Bor 11

— Pa. bako

26 — Pa. Bor 78

1 — Pa. sedgwicki

19

1

2

1

— Pa. iban

16

O- Pa. nigrifrons

i

18 [— Pa. Bor 100

1 — Pa. Bor 109

— Pa. cavicola

nigrifrons group

3 7 14 23

1111

*

13 16

1 1

17 22

1 1

*

2

1

9

1

15

0

Pa. alba

Pa. mirabills

Pa. madang

Pa. dubia

Pa. lanthana

26

-O- Pa. malagos

1

cavicoia group

1 4

Pa. casaroro

11 — Pa. camiguin

3 13

0-0— Pa. hamiguitan

o 1

— Pa. isarog

A

6 14 21 24

10 11

*

5 10 25 — Pa. dinagat

ill — Pa. marilog

lanthana group

Fig. 1. Strict consensus of two most parsimonious cladograms of Panjange Deeleman-Reinhold &

Deeleman, 1983 resulting from analyses of the matrix in Appendix 1 using equal character weights,

successive weighting, and implicit enumeration. Only unambiguous character changes are shown.

A = clade with asymmetric male palps; * = positions of Pa. bukidnon Huber sp. nov. in preliminary

cladistic analyses. See Cladistic analysis section for further details.

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European Journal of Taxonomy 169 : 1-46 ( 2015 )

Cladistic analysis

Preliminary analyses including all available species of Panjange (all 18 described species plus five

undescribed species) revealed that the highly aberrant Pa. bukidnon Huber sp. nov. was also the most

difficult to place in the cladogram. It ended up at three different positions, resulting in many trees and

a consensus with large polytomies. For this reason, Pa. bukidnon Huber sp. nov. was deleted from the

final matrix. It may be correctly placed in the lanthana group but its sister taxon remains unknown (see

Monophyly and relationships below).

One potentially informative character system was also largely deleted from the final matrix. The

apophyses and processes on the male palpal trochanter come in a wide variety of numbers, shapes and

positions, and it seemed impossible to code them in a convincing way. Only one detail was left in the

matrix (Appendix 3, character 10).

Using NONA with hold/100, mult*200 (or hold/10; mult* 10.000), and amb- for the matrix in Appendix

1 and equal character weights resulted in two most parsimonious cladograms with a length of 37 (Ci =

70; Ri = 90). Variation occurred only among outgroup taxa and in the support for the monophyly of

Panjange (characters 15 and 20, or only character 20). The cladogram shown in Fig. 1 is the strict

consensus of these two cladograms.

Using TNT with the implicit enumeration algorithm resulted in the same two trees, as did successive

weighting in NONA (with the consistency index as weighting function). Implied weighting in Pee-Wee

(which resolves character conflict in favor of the characters that have less homoplasy) was used with

various settings of the constant of concavity K (1-6) to explore the stability of different clades under

different weighting regimes. Major differences to the tree shown in Fig. 1 occurred only with K=1 and

K=2, which resulted in large polytomies and no support for the monophyly of Panjange. However,

even in these trees, the monophyly of the lanthana group was consistently recovered as was its close

relationship to the cavicola group. The only difference within the lanthana group concerned the position

of Pa. hamiguitan Huber sp. nov., which was not sister to Pa. isarog Huber sp. nov. + (Pa. dinagat

Huber sp. nov. + Pa. mar ilog Huber sp. nov.) but placed in a basal tetrachotomy.

Panjange lanthana group

Diagnosis

Males are easily distinguished from congeners in other species groups of Panjange by the unique

processes of the genital bulb (embolus and appendix), pointing in opposite directions (Figs 18, 64, 69).

Females differ from members of the nigrifrons group by their long folded scapes (Figs 22, 67, 72) but are

in general similar to females of the cavicola group. Other leaf-dwelling pholcids in the Philippines differ

from Panjange as follows: Calapnita with longer abdomen that is monochromous and dorso-posteriorly

not angular; male eyes on very low humps; embolus parallel to bulbal appendix. An undescribed group

of leaf-dwelling Pholcus species differs from Philippine Panjange species as follows: dorsal process on

procursus; embolus parallel to bulbal appendix; short male eye stalks without pointed processes; and

epigynum without long folded scape.

Description

Male

Measurements. Total body length -4.0-5.5; carapace width 0.9-1.2; leg 1 length ~30—45; tibia 1

length -8.0-10.5; tibia 2/tibia 4 length 1.10-1.25; tibia 1 L/d -95-110.

6

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Color. In life (Figs 2-15) mostly pale ochre-yellow to whitish, ocular area with brown mark, sternum

whitish, legs with dark patellae and tibia-metatarsus joints; abdomen with dark brown to black marks

dorsally and laterally, sometimes partly reddish.

Body. Carapace without median furrow; ocular area raised, eye triads on stalks of variable length (e.g.,

Figs 17, 28, 66, 71), often with pair of additional pointed processes arising from near PME (absent only

in Pa. lanthana). AME usually absent, clearly present only in Pa. lanthana , present but tiny and barely

visible in Pa. camiguin Huber sp. nov. males (Fig. 45). Clypeus high, either unmodified or with -20-25

short spines (Figs 84, 85), sometimes in addition to stronger hairs below ocular area (Fig. 84). Abdomen

cylindrical, angular above spinnerets (Figs 2, 9). Male gonopore with four epiandrous spigots (Figs

60, 88); each AES with large widened spigot, pointed spigot, and six cylindrically shaped spigots (of

varying sizes; Figs 32, 62); PMS with two spigots each (Fig. 63).

Chelicerae. With only one pair of frontal processes proximally, without distal apophyses (Figs 17, 47,

84); without modified hairs; without stridulatory ridges.

Palps. Coxa usually unmodified, in Pa. hamiguitan Huber sp. nov. and Pa. bukidnon Huber sp. nov.

with small ventral apophysis (Figs 65, 92); trochanter and femur very variable, with species-specific

sets of humps, short processes, and more complex apophyses; patella short to longer than wide; tibia

with two trichobothria; palpal tarsus usually with whitish dorsal elongation carrying tarsal organ (e.g.,

Figs 19, 25, 65), rarely short (e.g., Figs 70, 75), absent in Pa. bukidnon Huber sp. nov. (Fig. 92); palpal

tarsal organ capsulate (Fig. 89); procursus usually consisting of proximal and distal part connected by

membranous hinge (e.g., Figs 18, 64, 80), but not hinged in right palps of asymmetric species; parallel

ridges on procursus sometimes distinct (e.g.. Figs 18, 26, 52), sometimes indistinct or absent; bulb with

strong proximal sclerite (e.g.. Figs 18, 69), with two processes pointing in opposite directions: appendix

toward ventral, embolus toward dorsal.

Fegs. Without spines, without curved hairs, few vertical hairs; retrolateral trichobothrium very proximal

(tibia 1: at 2-4% of tibia length), prolateral trichobothrium absent on tibia 1, present on other tibiae.

Tarsus 1 with -30 pseudosegments, sometimes very indistinct; tarsus 4 with single row of ventral comb-

hairs of the Pholcus-typQ (cf. Huber & Fleckenstein 2008) (Fig. 58).

Female

Similar to male but without eye stalks; eye triads on low humps (Fig. 46); clypeus and chelicerae

unmodified; legs slightly shorter than in male. Epigynum weakly sclerotized, with more or less long,

folded and extensible scape directed either toward posterior or toward anterior (e.g., Figs 22, 36, 72);

sometimes widened at about half length (Figs 77, 82). Internal genitalia with pair of pore plates of

variable shape.

Monophyly and relationships

The monophyly of the Pa. lanthana group is consistently supported by two characters: the small

ventral process distally on the proximal part of the procursus (character 17; Figs 25, 70), and the unique

direction of the embolus, pointing in an opposite direction than the appendix rather than lying parallel to

it (character 22; Figs 18, 64, 69).

The closest relatives of the lanthana group are probably members of the Pa. cavicola group. This

relationship has been suggested before (Huber 2011) and is here supported by numerous characters:

hooked rather than straight spines in ocular area (character 3; Figs 48, 87); absence of distal cheliceral

apophyses (character 7; Figs 17, 47, 66); strong palpal tarsal elongation (character 14; Figs 19, 39, 65);

and long strongly folded epigynal scape (character 23; Figs 22, 36, 72).

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European Journal of Taxonomy 169 : 1-46 ( 2015 )

Within the lanthana group, the monophyly of three species Pa. malagos Huber sp. nov. + (Pa. casaroro

Huber sp. nov. + Pa. camiguin Huber sp. nov.) is supported only by the asymmetry of the male procursus

(character 9). A second species group, Pa. isarog Huber sp. nov. + (Pa. dinagat Huber sp. nov. + Pa.

marilog Huber sp. nov.) is strongly supported: male clypeus with spines (character 6; Figs 84, 85);

male palpal tarsal process secondarily short (character 14; Figs 70, 75, 80); uncus-like process arising

from proximal bulbal sclerite (character 21; Figs 70, 80); and epigynal scape directed toward anterior

(character 24; Figs 72, 77, 82). The sister taxa of Pa. lanthana and Pa. hamiguitan Huber sp. nov. remain

unclear. In Fig. 1, Pa. hamiguitan Huber sp. nov. is placed as sister to Pa. isarog Huber sp. nov. + (Pa.

dinagat Huber sp. nov. + Pa. marilog Huber sp. nov.), but this is weakly supported by the secondary

reduction of ridges on the procursus and was not recovered in all analyses (see above).

Entirely dubious is the position of Pa. bukidnon Huber sp. nov. (excluded from the analysis for reasons

detailed above; see “Cladistic analysis”). In preliminary analyses including Pa. bukidnon Huber sp.

nov., it ended up at three different positions, indicated in Fig. 1 by asterisks: (1) as sister to the lanthana

+ cavicola groups; (2) as sister to the lanthana group; or (3) as sister to Pa. isarog Huber sp. nov. +

(Pa. dinagat Huber sp. nov. + Pa. marilog Huber sp. nov.). It shares one of the synapomorphies of

the lanthana group (embolus pointing in opposite direction than appendix) but not the other (ventral

process on procursus). The parallel tips of the ocular spines (Fig. 90) remind of Pa. casaroro Huber sp.

nov. + Pa. camiguin Huber sp. nov. while the small rounded process between appendix and genital bulb

(Fig. 91) reminds of Pa. dinagat Huber sp. nov. + Pa. marilog Huber sp. nov. The procursus is highly

autapomorphic. It seems that only the discovery of the unknown female and/or molecular data may

solve this issue.

Natural history

Most species seem to have low abundances and very patchy distributions, with few specimens found

within a very small area and none in surrounding areas of apparently similar vegetation. This may have

been related to the low abundance and patchiness of suitable large leaves. Specimens were usually

collected between about 50 cm above ground to about 2 m, and they are likely to occur also in higher

strata of the forest, possibly in higher abundances. The web is a domed sheet, most of which is closely

attached to the underside of a leaf. The extremely fine silk is poorly visible except when the sheet is

viewed directly from the side. Egg sacs are only slightly elongated and covered by a barely visible layer

of silk (Figs 3, 8, 12). In one case (Pa. camiguin Huber sp. nov.; Fig. 8), eight of ten eggs in an egg sac

were parasitized by a parasitic wasp.

Composition

As construed here, the Panjange lanthana group now contains nine species (including the dubious

Pa. bukidnon Huber sp. nov.). Judging from known distribution patterns and from the large number of

poorly sampled islands, the group may well contain several times as many species.

Distribution

Known from the P hil ippines only (Fig. 16).

Panjange lanthana Deeleman-Reinhold & Deeleman, 1983

Figs 2-A

Panjange lanthana Deeleman-Reinhold & Deeleman, 1983: 124, figs 1-9 (c?¥)-

Panjange lanthana - Huber 2011: 111-114, figs 436-58, 765-66, 786, 788 ((??)•

8

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Figs 2-15. Live specimens. 2-4. Pa. lanthana, Mt. Isarog, $ with eggsac, and penultimate $. 5. Pa.

malagos Huber sp. nov., $. 6-7. Pa. casaroro Huber sp. nov., SS- 8-10. Pa. camiguin Huber sp. nov. 8.

$ with parasitized eggsac, from Camiguin Island. 9. $ from Bohol Island. 10. $ from Camiguin Island.

11-13. Pa. dinagat Huber sp. nov., S, $ with eggsac, and penultimate S- 14-15. Pa. marilog Huber sp.

nov., SS showing color variation.

9

European Journal of Taxonomy 169 : 1-46 ( 2015 )

Note

Previously, the type species Pa. lanthana was both geographically and systematically isolated. It was the only

known Philippine representative of the genus and single representative of the lanthana “group” (Deeleman-

Reinhold & Platnick 1986; Huber 2011), as it did clearly not fit into any of the other two species groups.

10

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

With the new species from the Philippines described below, the lanthana group can finally be characterized

based on several species, and the emended diagnosis below takes account of these new species.

Diagnosis

Distinguished from closest known relatives (other species of lanthana group) by absence of processes

arising from near male PME (cf. fig. 441 in Huber 2011), by presence of clearly visible AME, and

by morphology of male palp (cf. figs 436, 437 in Huber 2011; procursus with two highly distinctive

sclerites hinged against proximal part; appendix with simple weakly sclerotized tip). From three species

of the lanthana group (Pa. malagos Huber sp. nov.; Pa. casaroro Huber sp. nov.; Pa. camiguin Huber

sp. nov.) also by symmetric palps; from another three species of the lanthana group (Pa. isarog Huber

sp. nov.; Pa. dinagat Huber sp. nov.; Pa. marilog Huber sp. nov.) also by unmodified male clypeus and

by epigynal scape directed toward posterior (fig. 439 in Huber 2011); from Pa. hamiguitan Huber sp.

nov. also by much shorter palpal segments and epigynal scape.

New material examined

P HIL IPPINES: Luzon, Camarines Sur Province: 2 4 $$ in ZFMK (Arl2997) and 1 (?, 1 $ in

MSU-IIT, Mt. Isarog, W slope (13.664°N, 123.34-123.35°E), -600-900 m a.s.l., forest, on leaves, 23

Feb. 2014 (B.A. Huber); 6 juvs in pure ethanol in ZFMK (Phi 224), same data.

Natural history

All specimens were found in a shady ravine, with their domed webs connected to the undersides of green

leaves among the vegetation, about 1-2 m above the ground.

Distribution

Known from two localities on southern Luzon Island (Fig. 16).

Panjange malagos Huber sp. nov.

urn:lsid:zoobank.org:act:00D7154A-7034-4494-AE2D-026298207059

Figs 5, 17-23

Diagnosis

Easily distinguished from closest known relatives (Pa. casaroro Huber sp. nov.; Pa. camiguin Huber

sp. nov.) by short male eye stalks (Fig. 17), and by morphology of male palps (Figs 18-21; symmetric

modifications of trochanter and femur; asymmetric shapes of procursi); from Pa. casaroro Huber sp.

nov. also by simple epigynal scape without pair of semi-transparent lobes (Fig. 22); from Pa. camiguin

Huber sp. nov. also by absence of strong transversal sclerite in female internal genitalia (Fig. 23).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype in ZFMK (Ar 12998), Mindanao, Davao del Sur Province, Malagos

Watershed (7.184°N, 125.415°E), 390 m a.s.l., forest along river, on leaves, 14 Feb. 2014 (B.A. Huber,

E. Mondejar).

Other material examined

PHILIPPINES: 1 (?, 2 $$ in ZFMK (Ar 12999) and 1 $ in MSU-IIT, same data as holotype; 1 $ in

pure ethanol, in ZFMK (Phi 259), same data.

11

European Journal of Taxonomy 169: 1—46 (2015)

Description

Male (holotype)

Measurements. Total body length 4.6, carapace width 0.9. Leg 1: 41.3 (9.7 + 0.4 + 9.8 + 19.4 + 2.0),

tibia 2: 6.0, tibia 3: 3.2, tibia 4: 4.9; tibia 1 L/d: 110. Distance PME-PME 270 pm, diameter PME

120 pm, distance PME-ALE ~40 pm; AME absent.

Figs 17-19. Panjange malagos Huber sp. nov. (ZFMK, Ar 12999). 17. Male prosoma and chelicerae,

frontal view. 18-19. Left male palp, prolateral and retrolateral views. Abbreviations: a = appendix; b =

genital bulb; e = embolus; h = hinge; p = procursus; ps = proximal bulbal sclerite; pto = palpal tarsal

organ; te = tarsal elongation. Scale bars = 0.5 mm.

12

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Color. Carapace pale ochre yellow with indistinct posterior median mark, ocular area and clypeus

brown, black mark in AME area; sternum whitish; legs ochre-yellow with dark brown patellae and tibia-

metatarsus joints; abdomen ochre-gray, with black marks dorsally, monochromous ventrally.

Figs 20-23. Panjange malagos Huber sp. nov. (ZFMK, Ar 12999). 20-21. Right male palp, prolateral

and retrolateral views. 22-23. Cleared female genitalia, ventral and dorsal views. Scale bars = 0.5 mm.

13

European Journal of Taxonomy 169 : 1—46 ( 2015 )

Body. Habitus as in Fig. 5; ocular area raised, each triad on short stalk, medially with pointed process

directed toward frontal and ventral (Fig. 17); carapace without median furrow; clypeus unmodified;

sternum wider than long (0.65/0.55), unmodified.

Chelicerae. As in Fig. 17, with simple pair of weakly sclerotized processes in rather frontal position,

without modified hairs; without stridulatory ridges.

Palps. As in Figs 18-21; proximal segments symmetric in shape but slightly larger on left side (e.g.,

length and diameter of right tibia about 95-97% of left tibia); coxa with strong ventro-distal rim but

otherwise unmodified; trochanter with pointed retrolateral apophysis and rounded ventral hump; femur

with dorsal hump and weakly sclerotized semitransparent process retrolatero-ventrally; tarsus with long

whitish elongation with terminal tarsal organ; procursi of left and right palps strongly different, distal

part of procursus clearly hinged in left palp, not hinged in right palp; bulb slightly smaller in right

palp, with long processes extending in opposite directions (dorsal embolus; ventral appendix) almost

symmetric (slightly longer in left palp).

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with > 20 pseudosegments,

only distally fairly distinct.

Male (variation)

Not seen. Tibia 1 missing in other male.

Female

In general similar to male but eye triads on low humps and closer together (distance PME-PME 210 pm).

Tibia 1 in 3 females: 6.9, 7.0, 7.9. Epigynum large elongate plate, anterior part weakly sclerotized,

with symmetric or at most slightly asymmetric internal structures visible through cuticle; posterior part

orange, with extensible scape with distinct transversal folds and small median process (“knob”) at tip

(Fig. 22); internal genitalia as in Fig. 23.

Natural history

The spiders were found in very low abundance on the undersides of leaves about 50-200 cm above the

ground in a disturbed part of the forest.

Distribution

Known from type locality on Mindanao Island only (Fig. 16).

Panjange casaroro Huber sp. nov.

urn:lsid:zoobank.org:act:D6FF36FF-D69F-4F92-919F-82F423701E71

Figs 6-7, 24-34

Diagnosis

Easily distinguished from closest known relatives (Pa. malagos Huber sp. nov.; Pa. camiguin Huber sp. nov.)

by morphology of male palps (Figs 24-27; symmetric modifications of trochanter and femur; asymmetric

shapes of procursi), and by pair of semi-transparent lobes on epigynal scape (Figs 29, 33). From most

congeners (except Pa. camiguin Huber sp. nov.) also by very long eye stalks and contiguous tips of male

ocular processes (Fig. 28); from Pa. camiguin Huber sp. nov. also by proximally unmodified male chelicerae

(densely covered with small scales in Pa. camiguin Huber sp. nov.; cf. Fig. 47) and by small process between

eye stalks (Fig. 28).

14

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype S, in ZFMK (Ar 13000), Negros Island, Negros Oriental Province, Casaroro

Falls (9.281°N, 123.208°E), 550 m a.s.l., forest along river below waterfall, on leaves, 10 Mar. 2014

(B.A. Huber).

Other material examined

PHILIPPINES: 1 3 ? ? in ZFMK (Ar 13001) and 1 S, 1 $ in MSU-IIT, same data as holotype; 1 $,

1 juv. in pure ethanol, in ZFMK (Phi 187), same data.

Figs 24-25. Panjange casaroro Huber sp. nov. (ZFMK, Ar 13001), left male palp, prolateral and

retrolateral views. Abbreviations: a = appendix; b = genital bulb; e = embolus; h = hinge; p = procursus;

pto = palpal tarsal organ; te = tarsal elongation; tr = trochanter; vp = ventral process. Scale bar = 0.5 mm.

15

European Journal of Taxonomy 169 : 1-46 ( 2015 )

1 l/i

UJJZja

/.mvu 4

Figs 26-30. Panjange casaroro Huber sp. nov. (ZFMK, Ar 13001). 26-27. Right male palp, prolateral

and retrolateral views. 28. Male prosoma and chelicerae, frontal view. 29-30. Cleared female genitalia,

ventral and dorsal views. Scale bars = 0.5 mm.

16

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Description

Male (holotype)

Measurements. Total body length 4.8, carapace width 1.0. Leg 1: 39.2 (9.2 + 0.5 + 9.4 + 18.9 + 1.2),

tibia 2: 5.6, tibia 3: 3.2, tibia 4: 4.9; tibia 1 L/d: 106. Distance PME-PME 420 pm, diameter PME

105 pm, distance PME-ALE ~30 pm; AME absent.

Figs 31-34. Panjange casaroro Huber sp. nov., SEM micrographs (ZFMK, Ar 13001). 31. Female

spinnerets. 32. Female ALS. 33-34. Epigynum and scape. 33. Lateral (slightly posterior) view. 34.

Ventral view. Abbreviations: ALS, anterior lateral spinneret; PLS = posterior lateral spinneret; PMS =

posterior median spinneret. Scale bars: 31 = 60 pm; 32 = 10 pm; 33-34 = 100 pm.

17

European Journal of Taxonomy 169 : 1—46 ( 2015 )

Color. Carapace and clypeus pale ochre to whitish, only base of eye stalks dark; sternum whitish; legs

ochre-yellow with dark brown patellae and tibia-metatarsus joints; abdomen pale gray, with black marks

dorsally, monochromous ventrally.

Body. Habitus as in Figs 6-7; ocular area raised, triads on long stalks with further distal processes whose

contiguous tips seem to form a functional unit (Fig. 28); with small process between eye stalks; carapace

without median furrow; clypeus unmodified; sternum wider than long (0.65/0.55), unmodified.

Chelicerae. As in Fig. 28, with pair of simple, weakly sclerotized lateral processes, without modified

hairs; without stridulatory ridges.

Palps. As in Figs 24-27; proximal segments symmetric in shape but slightly larger on left side (e.g.,

length and diameter of right tibia about 90-95% of left tibia); coxa with strong ventro-distal rim but

otherwise unmodified; trochanter with long wealdy sclerotized retrolateral process directed toward dorsal;

femur with weakly sclerotized finger-shaped process retrolatero-ventrally and more heavily sclerotized

apophysis prolatero-dorsally; tibia with retrolateral trichobothrium in rather proximal position; tarsus

with long whitish elongation, distally more strongly widened (club-shaped) in left palp; procursi of left

and right palps strongly different, in each case with ventral process arising from proximal part (simple

in right palp; bifid in left palp); distal part of procursus clearly hinged in left palp, not hinged in right

palp; bulb much smaller in right palp, long processes extending in opposite directions (dorsal embolus;

ventral appendix) almost symmetric (slightly longer in left palp).

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with > 20 pseudosegments,

only distally fairly distinct.

Male (variation)

Tibia 1 in other male: 9.5 (missing in third male).

Female

In general similar to male but eye triads on low humps and much closer together (distance PME-PME

265 pm); with dark mark in place of AME. Tibia 1 in 4 females: 6.7, 7.0, 7.1, 7.4. Epigynum mostly

weakly sclerotized, with apparently slightly asymmetric internal structures visible through cuticle;

distinctive scape with small median process at tip and two long extensible projections curved toward

dorsal (Figs 29, 33, 34); internal genitalia as in Fig. 30.

Natural history

The spiders were found on the undersides of large leaves about 50-100 cm above the ground.

Distribution

Known from type locality on Negros Island only (Fig. 16).

Panjange camiguin Huber sp. nov.

urn:lsid:zoobank.org:act:A8245A4A-D792-4023-8E50-0922A9C29FD6

Figs 8-10, 35-63

Diagnosis

Easily distinguished from closest known relatives (Pa. malagos Huber sp. nov.; Pa. casaroro Huber

sp. nov.) by morphology of male palps (Figs 38-39; symmetric modifications of trochanter and femur;

asymmetric shapes of procursi; Figs 41^14), by proximally modified male chelicerae (densely covered

18

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

with small scales; Fig. 47), and by strong internal sclerite in female genitalia (Fig. 37). From most

congeners (except Pa. casaroro Huber sp. nov.) also by contiguous tips of male ocular processes (Figs

35, 45, 48—49); from Pa. casaroro Huber sp. nov. also by absence of process between eye stalks (Fig.

35), and by simple epigynal scape (Fig. 36; not with two distal lobes).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype in ZFMK (Ar 13002), Camiguin Island, Katibawasan Falls (9.215°N,

124.720°E), 300 m a.s.l., on leaves, 19 Feb. 2014 (B.A. Huber, PN. Banaag).

Other material examined

PHIFIPPINES: Camiguin Island: 7 $$, 17 ??, 1 juv. in ZFMK (Ar 13003, 13004) and 1 1 ? in

MSU-IIT, same data as holotype; 2 5?, 2 juvs in pure ethanol, in ZFMK (Phi 235), same data; 2

2 2 juvs in ZFMK (Ar 13005) and 1 1 $ in MSU-IIT, all poorly preserved, same locality, 5-6

May 2014 (E.P Mondejar); 2 SS, 7 ??, 1 juv. in ZFMK (Ar 13006), Mt. Hibok Hibok (9.196°N,

124.692°E), 600 m a.s.l., on leaves, 18 Feb. 2014 (B.A. Huber, PN. Banaag); 2 $$, 2 juvs in pure

ethanol, in ZFMK (Phi 241), same data. Bohol Island: 2 SS, 5 $$ in ZFMK (Ar 13007), near Foboc,

above Foboc River (~9.655°N, 124.015°E), -250 m a.s.l., forest near caves, 5 Mar. 2014 (B.A. Huber);

Figs 35-37. Panjange camiguin Huber sp. nov. (ZFMK, Ar 13003, 13004). 35. Male prosoma and

chelicerae, frontal view. 36-37. Cleared female genitalia, ventral and dorsal views. Scale bars = 0.5 mm.

19

European Journal of Taxonomy 169 : 1-46 ( 2015 )

Figs 38-44. Panjange camiguin Huber sp. nov. (ZFMK, Ar 13003). 38-39. Left male palp, prolateral

and retrolateral views. 40. Male chelicerae, frontal view. 41^42. Left male tarsus and procursus,

prolateral and retrolateral views. 43-44. Right male tarsus and procursus, retrolateral and prolateral

views. Abbreviations: a = appendix; b = genital bulb; e = embolus; p = procursus; te = tarsal elongation;

tr = trochanter. Scale bars: 38-39, 41—44 = 1 mm ; 40 = 0.3 mm

20

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Figs 45-49. Panjange camiguin Huber sp. nov., SEM micrographs (ZFMK, Ar 13003, 13004). 45-

46. Male and female prosomata, frontal views (arrows point at tiny AME remnants). 47. Male chelicerae.

48^9. Male eye triads and ocular processes, oblique frontal and frontal views. Scale bars: 45—46, 49 =

200 pm; 47—48 = 100 pm.

21

European Journal of Taxonomy 169 : 1-46 ( 2015 )

Figs 50-58. Panjange camiguin Huber sp. nov., SEM micrographs (ZFMK, Ar 13003, 13004). 50-

51. Left and right male palps, retrolateral views. 52. Left procursus and appendix, prolateral view. 53-

54. Left and right male palpal trochanters and femora proximally, retrolateral views. 55. Tip of embolus.

56-57. Left and right procursus tips, retrolateral views. 58. Comb-hairs on female tarsus 4. Abbreviations:

a = appendix; f = femur; p = procursus; sdo = sperm duct opening; te = tarsal elongation; tr = trochanter.

Scale bars: 50-51 = 300 pm; 52 = 200 pm; 53-54 = 100 pm; 55 = 30 pm; 56-57 = 80 pm; 58 = 20 pm.

22

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

1 5,3 juvs in pure ethanol, in ZFMK (Phi 199), same data; 1 $ with 8 hymenopteran parasites and

2 juveniles emerged from same egg sac, in pure ethanol in ZFMK (Phi 291), same data (Fig. 8); 1

4 1 juv. in ZFMK (Ar 13008), Rajah Sikatuna (Magsaysay Park) (9.705°N, 124.123°E), 430 m

a.s.l., forest, on leaves, 6 Mar. 2014 (B.A. Huber); 4 juvs in pure ethanol in ZFMK (Phi 194), same data;

5 SS, 11 34 juvs in ZFMK (Ar 15064) and 2 S3, 2 $$ in MSU-IIT, Bilar, Barangay Riverside

(~9.705°N, 12.125°E), 15 Jun. 2015 (M.R.B. Dacar).

Figs 59-63. Panjange camiguin Huber sp. nov., SEM micrographs (ZFMK, Ar 13003, 13004).

59. Female spinnerets. 60. Male gonopore. 61. Epigynum and scape, ventral view. 62. Female AES.

63. Female PMS. Abbreviations: AES = anterior lateral spinneret; PFS = posterior lateral spinneret;

PMS = posterior median spinneret. Scale bars: 59 = 60 pm; 60 = 30 pm; 61 = 100 pm; 62-63 = 10 pm.

23

European Journal of Taxonomy 169: 1-46 (2015)

Assigned tentatively

PHILIPPINES, Bohol Island: 2 SS, 4 juvs inZFMK (Ar 15065) and 1 $ inMSU-IIT, Garcia Hernandez,

Barangay Datag (~9.719°N, 124.262°E), 8 Jun. 2015 (M.R.B. Dacar); 3 SS, 4 $ ?, 4 juvs in ZFMK (Ar

15066) and 1 S, 1 ? inMSU-IIT, Valencia, Barangay Marawis (9.723°N, 124.202°E), 10-11 Jun. 2015

(M.B.R. Dacar); 2 88, 8 ?$, 5 juvs in ZFMK (Ar 15067) and 1 S, 1 $ in MSU-IIT, Sierra Bullones,

Barangay Nan-od (~9.748°N, 124.264°E), 4-5 Jun. 2015 (M.R.B. Dacar).

Description

Male (holotype)

Measurements. Total body length 5.0, carapace width 1.0. Leg 1: 43.2 (9.8 + 0.5 + 9.9 + 21.1 + 1.9),

tibia 2: 6.1, tibia 3: 3.1, tibia 4: 5.0; tibia 1 L/d: 103. Distance PME-PME 355 pm, diameter PME

125 pm, distance PME-ALE ~35 pm; with tiny AME lenses barely visible in dissecting microscope,

diameter ~10 pm (Fig. 45).

Color. Carapace pale ochre with darker triangular mark posteriorly, pair of dark marks lateral of base of

eye stalks, and median mark in AME area; clypeus without pattern; sternum whitish; legs ochre-yellow

with dark brown patellae and tibia-metatarsus joints; abdomen pale gray, with black marks dorsally,

monochromous ventrally.

Body. Habitus as in Figs 9-10; ocular area raised, triads on long additional stalks with further distal

processes whose contiguous tips seem to form a functional unit (Figs 35, 45, 48M9); without process

between eye stalks; carapace without median furrow; clypeus unmodified; sternum wider than long

(0.70/0.50), unmodified.

Chelicerae. As in Fig. 47, with pair of curved, wealdy sclerotized lateral processes, proximally densely

covered with small scales; without modified hairs; without stridulatory ridges.

Palps. As in Figs 38-39, 50-51; proximal segments symmetric in shape and apparently also in size

(Figs 53-54); coxa with strong ventro-distal rim but otherwise unmodified; trochanter with distinctive

pair of apophyses (retrolateral and dorsal; Figs 53, 54); femur with weakly sclerotized retrolateral

process directed toward dorsal and short ventral process directed toward proximal (Figs 53, 54); patella

very small; tibia large; tarsus with long whitish elongation; procursi of left and right palps slightly but

clearly different, distal part of procursus hinged in left palp, not hinged in right palp (Figs 41—44);

bulb symmetric in shape, with long processes extending in opposite directions (dorsal embolus; ventral

appendix), apparently slightly longer in left palp.

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with > 20 pseudosegments,

only distally fairly distinct.

Male (variation)

Tibia 1 in 11 other males: 8.6-10.1 (mean 9.5). Males from the three eastern sites on Bohol Island

(Datag, Marawis, Nan-od) differ slightly but consistently from other specimens in the tip of the right

procursus that has a distinct retrolateral process. Specimens from these localities are therefore assigned

tentatively.

Female

In general similar to male but eye triads on low humps and much closer together (distance PME-PME

260 pm), without AME remnants (Fig. 46); posterior mark on carapace smaller, often medially divided;

dark abdomen spots in some specimens very indistinct or even absent. Tibia 1 in 32 females: 6.4-8.2 (mean

24

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

7.1). Epigynum apparently symmetric, mostly weakly sclerotized, with strong internal transversal sclerite

visible through cuticle; extensible scape with strong transversal folds, laterally light brown to orange, with

small median process at tip (Figs 36, 61); internal genitalia as in Fig. 37, also apparently symmetric.

Natural history

The spiders were found on the undersides of large leaves to which they attach fairly dense but barely

visible sheets of silk. One female was collected on 5 Mar. 2014 with a parasitized egg sac from which

all eggs hatched on 12 Mar. 2014 (two spiders and eight wasps).

Distribution

Known from Camiguin and Bohol Islands (Fig. 16).

Panjange hamiguitan Huber sp. nov.

um:lsid:zoobank.org:act:C44C7291-5943-45Cl-AACl-F6B684836BBD

Figs 64-68

Diagnosis

Easily distinguished from known congeners by extremely elongated male palpal elements and female

epigynal scape (Figs 64-65, 67).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHIFIPPINFS: holotype in ZFMK (Ar 13009), Mindanao, Davao Oriental, Mount Hamiguitan

Wildlife Sanctuary (access Governor Generoso), “site 1” (9.6463°N, 126.1442°E), 250 m a.s.l., 12 Feb.

2015 (M.A. Responte).

Other material examined

P HIL IPPINES, Mindanao, Davao Oriental: 1 $, 2 juvs in ZFMK (Ar 13010) and 1 $ in MSU-IIT,

same data as holotype; 1 $, 1 juv. in ZFMK (Ar 13011), Mount Hamiguitan Wildlife Sanctuary (access

Governor Generoso), “site 2” (9.6497°N, 126.1487°E), 360 m a.s.l., 13 Feb. 2015 (M.A. Responte);

1 5, 1 juv. in ZFMK (Ar 13012), Mount Hamiguitan Wildlife Sanctuary (access Governor Generoso),

“site 3” (9.6569°N, 126.1559°E), 580 m a.s.l., 13 Feb. 2015 (M.A. Responte).

Description

Male (holotype)

Measurements. Total body length 5.1, carapace width 0.9. Teg 1: -33.3 (7.9 + 0.4 + 7.8 + 15.7 + ~1.5),

tibia 2: 4.9, tibia 3: 2.8, tibia 4: 4.3; tibia 1 F/d: 99. Distance PME-PME 195 pm, diameter PME 95 pm,

distance PME-AFE -60 pm; AME absent.

Color. Carapace pale ochre-yellow with pair of light brown marks, ocular area dark brown, with black

marks in place of AME, clypeus pale ochre to whitish; sternum whitish; legs pale ochre-yellow with

dark brown patellae and tibia-metatarsus joints; abdomen pale gray, with many black marks dorsally and

laterally; ventrally with pair of small dark marks near book-lung covers.

Body. Habitus similar to Pa. casaroro Huber sp. nov. and Pa. camiguin Huber sp. nov. (cf. Figs 6, 9);

ocular area raised, triads on additional stalks with further weakly sclerotized distal processes directed

toward each other (Fig. 66); carapace without median furrow; clypeus unmodified; sternum wider than

long (0.56/0.46), unmodified.

25

European Journal of Taxonomy 169: 1-46 (2015)

Chelicerae. As in Fig. 66, with pair of simple, weakly sclerotized frontal processes slightly directed

upwards, without modified hairs; without stridulatory ridges.

Palps. As in Figs 64-65; all elements symmetrical; all elements distal of trochanter extremely elongated;

coxa with distinct ventral apophysis; trochanter with two weakly sclerotized retrolateral processes; femur

with weakly sclerotized bifid retrolateral process proximally; tarsus with extremely slender elongation,

Figs 64-65. Panjange hamiguitan Huber sp. nov. (ZFMK, Ar 13009), left male palp, prolateral and

retrolateral views. Abbreviations: a = appendix; b = genital bulb; e = embolus; h = hinge; p = procursus;

pto = palpal tarsal organ; te = tarsal elongation; vp = ventral process. Scale bar = 1 mm.

26

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

with tarsal organ near tip; procursus consisting of two hinged parts; proximal part distally widened,

with small pointed ventral process; distal part very simple; bulb very thin and long, with long processes

extending in opposite directions (dorsal embolus; ventral appendix).

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 3%;

prolateral trichobothrium absent on tibia 1, present on other tibiae.

Female

In general similar to male but eye triads on low humps, ocular area with narrow transversal dark mark

including black marks in place of AME. Tibia 1: 6.8 (missing in other females). Epigynum pale, weakly

sclerotized, with very long strongly folded and extensible scape (Fig. 67); internal genitalia as in Fig. 68.

Distribution

Known from type locality on Mindanao only (Fig. 16).

Figs 66-68. Panjange hamigiiitan Huber sp. nov. (ZFMK, Ar 13009, 13012). 66. Male prosoma

and chelicerae, frontal view. 67. Cleared female genitalia, dorsal view (proximal part of scape partly

extended). 68. Detail of Fig. 67. Scale bars: 66-67 = 0.5 mm; 68 = 0.3 mm.

27

European Journal of Taxonomy 169: 1—46 (2015)

Panjange isarog Huber sp. nov.

um:lsid:zoobank.org:act:AEDDA6F2-E310-4FAA-873D-A001878505A2

Figs 69-73

Diagnosis

Easily distinguished from closest known relatives {Pa. marilog Huber sp. nov.; Pa. dinagat Huber sp.

nov.) by processes arising from near male PME with widened tips (Fig. 71), by morphology of male

palp (Figs 69, 70; simple retrolatero-ventral trochanter apophysis; procursus with transparent dorsal

flap; appendix with simple tip, short and evenly curved), and by epigynal scape without widening in

mid-section (Fig. 72). From other congeners also by male clypeus modification (Fig. 71; patch of -25

short spines), and by epigynal scape directed toward anterior (Fig. 72).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype inZFMK (Ar 13013), Luzon, Camarines Sur Province, Mt. Isarog, W slope

(13.664°N, 123.34-123.35°E), -600-900 m a.s.l., forest, on leaves, 23 Feb. 2014 (B.A. Huber).

Other material examined

PHILIPPINES: 2 § $ in ZFMK (Ar 13014), same data as holotype.

Description

Male (holotype)

Measurements. Total body length 5.2, carapace width 1.1. Leg 1: 38.8 (8.9 + 0.5 + 9.1 + 18.3 + 2.0),

tibia 2: 6.1, tibia 3: 3.6, tibia 4: 5.5; tibia 1 L/d: 98. Distance PME-PME 450 pm, diameter PME 90 pm,

distance PME-ALE -40 pm; AME absent.

Color. Carapace pale ochre yellow to whitish, without posterior mark, ocular area and clypeus dark

brown, with black mark in AME area; sternum whitish; legs ochre-yellow with dark brown patellae and

tibia-metatarsus joints; abdomen ochre-gray, with black marks dorsally, monochromous ventrally.

Body. Habitus similar to Pa. marilog Huber sp. nov. and Pa. dinagat Huber sp. nov. (cf. Figs 11, 14);

ocular area raised, each triad on long stalk, curved process arising from near PME with distinctive

widened tip directed toward anterior (Fig. 71); carapace without median furrow; clypeus with distinct

field of -25 short spines, with slightly longer but not stronger hairs below black mark; sternum wider

than long (0.70/0.55), unmodified.

Chelicerae. As in Fig. 71, with pair of simple, wealdy sclerotized processes in rather frontal position

directed toward median; without modified hairs; without stridulatory ridges.

Palps. As in Figs 69-70; symmetric; coxa with strong ventro-distal rim but otherwise unmodified;

trochanter relatively long, with two simple retrolateral processes; femur short, with two short dorsal

processes; tibia short and wide (width -65% of length); tarsus with short whitish elongation with

subterminal tarsal organ; procursus proximal part with pointed ventral process, distal part hinged, very

complex, with distinctive dorsal transparent flap; bulb with strong proximal sclerite, with processes

extending in opposite directions (dorsal embolus; ventral appendix with many small scales), with small

retrolateral toothed process arising from proximal bulbal sclerite, without small round sclerite between

appendix and bulb.

28

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Figs 69-73. Panjange isarog Huber sp. nov. (ZFMK,Ar 13013,13014). 69-70. Left male palp, prolateral

and retrolateral views. 71. Male prosoma and chelicerae, frontal view. 72-73. Cleared female genitalia,

ventral and dorsal views. Abbreviations: a = appendix; b = genital bulb; e = embolus; p = procursus;

ps = proximal bulbal sclerite; te = tarsal elongation; tp = toothed process of proximal bulbal sclerite;

tr = trochanter. Scale bars: 69-71 = 0.5 mm; 72-73 = 0.3 mm.

29

European Journal of Taxonomy 169: 1—46 (2015)

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with > 30 pseudosegments,

only distally distinct.

Female

In general similar to male but eye triads on low humps and much closer together (distance PME-PME

250 pm); clypeus unmodified. Tibia 1: 6.9, 7.4. Epigynum very small, weakly sclerotized plate with

scape directed toward anterior, scape strongly folded, apparently extensible, without widening in mid¬

section (Fig 72); internal genitalia as in Fig. 73.

Distribution

Known from type locality on Luzon Island only (Fig. 16).

Panjange dinagat Huber sp. nov.

um:lsid:zoobank.org:act:A711003E-5B76-4450-B9EE-C618A2200483

Figs 11-13, 74-78

Diagnosis

Easily distinguished from most known relatives (except Pa. marilog Huber sp. nov.) by complex male

palpal trochanter apophysis (Fig. 75), and by widening of epigynal scape in mid-section (Fig. 77);

from Pa. marilog Huber sp. nov. by male pedipalp (Figs 74-75; relatively wider tibia; shorter whitish

elongation of tarsus; different shapes of procursus and appendix; more slender embolus) and female

genitalia (longer than wide; Fig. 77).

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype S, in ZFMK (Ar 13015), Dinagat Island, near Libjo, Paragua Forest, “site 1”

(10.222°N, 125.553°E), 130 m a.s.l., forest at brook, on leaves, 20 Feb. 2014 (B.A. Huber, PN. Banaag).

Other material examined

PHILIPPINES, Dinagat Island: 1 $, 3 $$, 2 juvs in ZFMK (Ar 13016), same data as holotype; 1 §,

2 juvs in pure ethanol, in ZFMK (Phi 232), same data; 1 $ in ZFMK (Ar 13017), near Libjo, Paragua

Forest, “site 2” (10.241°N, 125.545°E), 240 m a.s.l., forest along brook, on leaf, 20 Feb. 2014 (B.A.

Huber, PN. Banaag).

Description

Male (holotype)

Measurements. Total body length 4.4, carapace width 1.0. Leg 1: 33.9 (7.8 + 0.5 + 7.9 + 15.7 + 2.0),

tibia 2: 5.0, tibia 3: 2.8, tibia 4: 4.3; tibia 1 L/d: 97. Distance PME-PME 430 pm, diameter PME 90 pm,

distance PME-ALE ~50 pm; AME absent.

Color. Carapace pale ochre yellow to whitish, without posterior mark, ocular area and clypeus dark

brown, with black mark in AME area; sternum whitish; legs ochre-yellow with dark brown patellae and

tibia-metatarsus joints; abdomen ochre-gray, with black marks dorsally, monochromous ventrally.

Body. Habitus as in Fig. 11; ocular area raised, each triad on long stalk, with pointed curved process

arising from near PME and directed toward anterior (Fig. 76); carapace without median furrow; clypeus

30

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

i

Of K \ j

■ .N>4i isle'

<X\ \

/ Jfff

' (

V

( ,

I

.. \

s Jr

wefeu z- rfcig'' '9

H \ \

\

Znf

i -

#i h

j/ || ,

J Jj

Figs 74-78. Panjange dinagat Huber sp. nov. (ZFMK, Ar 13016). 74-75. Left male palp, prolateral

and retrolateral views. 76. Male prosoma and chelicerae, frontal view. 77-78. Cleared female genitalia,

ventral and dorsal views. Abbreviations: a = appendix; b = genital bulb; e = embolus; p = procursus;

tr = trochanter. Scale bars: 74-76 = 0.5 mm; 77-78 = 0.3 mm.

31

European Journal of Taxonomy 169: 1—46 (2015)

with two patches of modified hairs: slightly stronger hairs below black mark and distinct field of -20

short spines more distally; sternum wider than long (0.65/0.50), unmodified.

Chelicerae. As in Fig. 76, with pair of simple, wealdy sclerotized processes in rather frontal position

directed toward median; without modified hairs; without stridulatory ridges.

Palps. As in Figs 74-75; symmetric; coxa with strong ventro-distal rim but otherwise unmodified;

trochanter relatively long, with simple retrolatero-dorsal process and complex retrolatero-ventral

apophysis, distally curved toward prolateral, with two distinctive subdistal branches directed toward

distal and retrolateral respectively; femur short, with two short dorsal processes and very indistinct

prolateral hump; tibia very thick (width -70% of length); tarsus with short whitish elongation with

terminal tarsal organ; procursus proximal part with rounded ventral process, distal part hinged, with

distinctive retrolateral process and simple flat prolateral process; bulb with strong proximal sclerite, long

processes extending in opposite directions (dorsal embolus; ventral appendix), with retrolateral toothed

process arising from proximal bulbal sclerite, with small round sclerite between appendix and bulb.

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 pseudosegments barely

visible in dissecting microscope.

Male (variation)

Tibia 1 in other male: 7.8.

Female

In general similar to male but eye triads on low humps and much closer together (distance PME-PME

220 pm); clypeus unmodified. Tibia 1 in 4 females: 5.9, 6.1, 6.1, 6.7. Epigynum weakly sclerotized plate

with scape directed toward anterior, scape strongly folded and extensible, with distinctive widening in

mid-section (Fig. 77), distal part semitransparent; internal genitalia as in Fig. 78.

Natural history

The spiders were found on the undersides of large leaves about 0.5-2 m above the ground.

Distribution

Known from type locality on Dinagat Island only (Fig. 16).

Panjange marilog Huber sp. nov.

um:lsid:zoobank.org:act:0B086DBA-DB8C-4253-AB9C-E932F2697216

Figs 14-15, 79-89

Diagnosis

Easily distinguished from most known relatives (except Pa. dinagat Huber sp. nov.) by complex male

palpal trochanter apophysis (Fig. 80), and by widening of epigynal scape in mid-section (Fig. 82); from

Pa. dinagat Huber sp. nov. by male pedipalp (Figs 79-80; relatively more slender tibia; longer whitish

elongation of tarsus; different shapes of procursus and appendix; wider embolus) and female genitalia

(wider than long; Fig. 82).

Etymology

The species name is derived from the type locality; noun in apposition.

32

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Type material

P HIL IPPINES: holotype S, in ZFMK (Ar 13018), Mindanao, Davao del Sur Province, Marilog Distr.,

Baganihan (7.469°N, 125.250°E), 1210 m a.s.l., primary forest near road, on leaves, 15 Feb. 2014 (B.A.

Huber, E. Mondejar).

Other material examined

PHILIPPINES: Davao del Sur Province: 4 $$, 1 $ in ZFMK (Ar 13019) and 1 $ in MSU-IIT, same

data as holotype; 2 5 $, 3 juvs in pure ethanol, in ZFMK (Phi 255), same data; 1 cJ, 1 $ in ZFMK (Ar

13020), same locality, “site 2” (7.4563°N, 125.2390°E), 6 Dec. 2014 (M.A. Responte); 1 <$, 2 $$, 3

juvs in ZFMK (Ar 13021) and 1 S, 1 $ in MSU-IIT, same locality, “site 3” (7.4696°N, 125.2452°E), 7

Dec. 2014 (M.A. Responte). Bukidnon Province: 2 S3, 4 $ §, 7 juvs in ZFMK (Ar 13022) and 1 3, 1 ?

in MSU-IIT, all poorly preserved, Imbayao (8.1344°N, 125.0297°E), 9-10 Feb. 2015 (E.P. Mondejar).

Description

Male (holotype)

Measurements. Total body length 5.1, carapace width 1.2. Leg 1: 41.2 (9.6 + 0.5 + 9.7 + 19.1 + 2.3),

tibia2: 6.5, tibia 3: 3.8, tibia 4: 5.7; tibia 1 L/d: 97. Distance PME-PME 470 pm, diameter PME 90 pm,

distance PME-ALE -50 pm; AME absent.

Color. Carapace pale ochre yellow to whitish, without posterior mark, ocular area and clypeus dark

brown, with black mark in AME area; sternum whitish; legs ochre-yellow with dark brown patellae and

tibia-metatarsus joints; abdomen ochre-gray, with black marks dorsally, monochromous ventrally.

Body. Habitus as in Fig. 14; ocular area raised, each triad on long stalk, with pointed curved process

arising from near PME and directed toward anterior (Figs 81, 84, 87); carapace without median furrow;

clypeus with two patches of modified hairs: slightly stronger hairs below black mark and distinct field of

-20 short spines more distally (Figs 84-85); sternum wider than long (0.70/0.60), unmodified.

Chelicerae. As in Figs 81 and 84, with pair of simple, weakly sclerotized processes in rather frontal

position directed toward median; without modified hairs; without stridulatory ridges.

Palps. As in Figs 79-80; symmetric; coxa with strong ventro-distal rim but otherwise unmodified;

trochanter relatively long, with simple retrolatero-dorsal process and complex retrolatero-ventral

apophysis distally curved toward prolateral, with two distinctive subdistal branches directed toward

distal and retrolateral respectively; femur short, with two short dorsal processes and indistinct prolateral

hump; tibia very thick (tibia width -60% of length); tarsus with whitish elongation with terminal

capsulate tarsal organ (Fig. 89); procursus proximal part with ventral process, distal part hinged, with

distinctive retrolateral process and simple flat prolateral process; bulb with strong proximal sclerite, long

processes extending in opposite directions (dorsal embolus; ventral appendix), with retrolateral process

arising from proximal bulbal sclerite, with small round sclerite between appendix and bulb.

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 2%;

prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with > 30 pseudosegments,

only distally fairly distinct.

Male (variation)

Tibia 1 in 10 other males: 9.2-10.4 (mean 9.6). Background color of abdomen with variable shades of

reddish to light brown (Figs 14-15).

33

European Journal of Taxonomy 169: 1-46 (2015)

>1 1

f v

yr

& X

\

A- \

■''-//PI

.s / f f

Jr W/%L

I X/ffl

X

' / / '

ip ft A,

Figs 79-83. Panjange marilog Huber sp. nov. (ZFMK, Ar 13019) 79-80. Left male palp, prolateral

and retrolateral views. 81. Male prosoma and chelicerae, frontal view. 82-83. Cleared female genitalia,

ventral and dorsal views. Abbreviations: a = appendix; b = genital bulb; e = embolus; h = hinge;

p = procursus; pto = palpal tarsal organ; te = tarsal elongation; tp = toothed process of proximal bulbal

sclerite; tr = trochanter; vp = ventral process. Scale bars: 79-81 = 0.5 mm; 82-83 = 0.3 mm.

34

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Figs 84-89. Panjange marilog Huber sp. nov., SEM micrographs (ZFMK, Ar 13019). 84. Male prosoma,

frontal view (asterisk marks stronger hairs below ocular area). 85. Spines on male clypeus. 86. Left male

palp, prolateral view. 87. Right eye stalk, triad, and hooked process, oblique frontal view. 88. Male

gonopore. 89. Male palpal tarsal organ. Abbreviations: a = appendix; b = genital bulb; p = procursus;

te = tarsal elongation; sp = spines on clypeus; vp = ventral process. Scale bars: 84 = 300 pm; 85 = 40 pm;

86 = 200 pm; 87 = 80 pm; 88 = 30 pm; 89 = 20 pm.

35

European Journal of Taxonomy 169: 1-46 (2015)

Female

In general similar to male but eye triads on low humps and much closer together (distance PME-PME

240 pm); clypeus unmodified. Tibia 1 in 4 females: 7.1, 7.3, 7.3, 7.5. Epigynum weakly sclerotized

plate with scape directed toward anterior, scape strongly folded, apparently extensible, with distinctive

widening in mid-section (Fig. 82), distal part semitransparent; internal genitalia as in Fig. 83.

Natural history

The spiders were found on the undersides of leaves about 0.5-1 m above the ground.

Distribution

Known from two localities on Mindanao Island (Fig. 16).

Panjange bukidnon Huber sp. nov.

um:lsid:zoobank.org:act:lB7C5428-F2F6-49B6-BC90-79B2C761F2B7

Figs 90-92

Diagnosis

Easily distinguished from known congeners (and other similar relatives currently in Pholcus) by

modifications of male ocular area (Fig. 90; short stalks and distinctive processes arising from near

PME, with contiguous pointed tips), and by morphology of male palp (Figs 91-92; highly distinctive

procursus; shapes of bulbal processes). Female unknown.

Etymology

The species name is derived from the type locality; noun in apposition.

Type material

PHILIPPINES: holotype in ZFMK (Ar 13023), Mindanao, Bukidnon Province, Santo Domingo

(7.782°N, 125.397°E), 560 m a.s.l., forest remnant along brook, on leaf, 8-9 Feb. 2014 (B.A. Huber, E.

Mondejar).

Other material examined

None.

Description

Male (holotype)

Measurements. Total body length 5.0, carapace width 0.9. Teg 1: 9.8 + 0.4 + 9.8, metatarsi broken in

both legs, tibia 2: 6.4, tibia 3: 3.7, tibia 4: 5.4; tibia 1 F/d: 110. Distance PME-PME 250 pm, diameter

PME 100 pm, distance PME-AFE ~30 pm; AME absent.

Color. Entire spider mostly pale ochre-gray to whitish, except large dark brown mark in ocular area

including clypeus, pair of indistinct dark marks posteriorly on carapace, few small dark spots on abdomen

dorsally, and brown patellae and tibia-metatarsus joints.

Body. Habitus similar to Pa. malagos Huber sp. nov. (cf. Fig. 5); ocular area raised, each triad on short

stalk, with distinctive processes arising from near PME with contiguous tips (Fig. 90); carapace without

median furrow; clypeus unmodified; sternum wider than long (0.65/0.55), unmodified.

Chelicerae. As in Fig. 90, with pair of simple, weakly sclerotized proximal processes in rather frontal

position; each lamina with additional small tooth; without modified hairs; without stridulatory ridges.

36

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Palps. As in Figs 91-92; symmetric; coxa with distinct ventral apophysis; trochanter with short

retrolateral apophysis; femur small, barely modified; tibia very large and wide (width -65% of length);

tarsus without elongation; procursus proximal part very short, without ventral process, distal part hinged,

very large, without (or with very indistinct) parallel ridges; bulb with strong proximal sclerite, with very

Figs 90-92. Panjange bukidnon Huber sp. nov. (ZFMK, Ar 13023). 90. Male prosoma and chelicerae,

frontal view. 91-92. Left male palp, prolateral and retrolateral views. Abbreviations: a = appendix;

b = genital bulb; e = embolus; h = hinge; p = procursus. Scale bars = 0.5 mm.

37

European Journal of Taxonomy 169: 1-46 (2015)

short processes (embolus and appendix) extending in opposite directions, without retrolateral process

arising from proximal bulbal process, with small round sclerite between appendix and bulb.

Legs. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 4%;

prolateral trichobothrium absent on tibia 1, present on other tibiae.

Female

Unknown.

Distribution

Known from type locality on Mindanao Island only (Fig. 16).

Discussion

The Panjange lanthana group, previously monotypic (Deeleman-Reinhold & Platnick 1986; Huber

2011), is a diverse group apparently restricted to the Philippines and supported by two synapomorphies.

The configuration of the male bulbal sclerites (embolus pointing in opposite direction than appendix) is

unique among Pholcidae. A close relationship of the lanthana group with the widespread cavicola group

(Sulawesi to Australia) is strongly supported by the cladistic analysis. However, the relationship of these

two groups to the third species group ( nigrifrons group on Borneo) remains unclear. The characters

supporting the monophyly of Panjange do not appear particularly convincing: (1) the reduction of the

uncus has occurred repeatedly within Pholcus (Huber 2011); and (2) the ridges on the procursus are

barely visible or absent in some species. In fact, preliminary molecular data (A. Valdez-Mondragon,

D. Dimitrov, B.A. Huber unpublished data) suggest Panjange might not be monophyletic.

Spider genital asymmetry is apparently exceedingly rare, and to our knowledge has been documented in

only nine of currently 3959 extant spider genera (genus count from World Spider Catalog 2015). Most

cases are in Pholcidae (independent origins in Mesabolivar Gonzalez-Sponga, 1998, Metagonia Simon,

1893, and Panjange ; Huber 1997b, 2004, 2006; herein), and Oonopidae (presumably independent

origins in Lionneta Benoit, 1979, Escaphiella Platnick & Duperre, 2009, Aschnaoonops Makhan &

Ezzatpanah, 2011, and Paradysderina Platnick & Duperre, 2011; Burger 2010; Platnick & Duperre

2009, 2011; Platnick et al. 2013). Further cases have been reported in Theridiidae ( Asygyna Agnarsson,

2006; Agnarsson 2006) and Oxyopidae ( Oxyopes Latreille, 1804; Brady 1964, 1975). An attempt to

explain the rarity of this phenomenon in spiders (as opposed to the ubiquity in insects) was made in

Huber et al. (2007). This explanation centers on the fact that one-sided mating positions are an option

for neopteran insects with their unpaired intromittent organ but not for spiders with their paired palps.

While this may explain the rarity in spiders, it does not explain those few cases where asymmetry did

evolve. A previous idea, that spider asymmetry may usually originate in the female as a result of space

constraints (Huber 2004,2006; Huber et al. 2007) may apply to certain taxa (e.g., Asygyna , Mesabolivar ,

Metagonia ) but apparently not to others. In Oonopidae, most cases of asymmetry seem to be restricted

to males. However, routine preparations of female internal genitalia may simply fail to reveal subtle

asymmetries. In fact, the only oonopid case of female asymmetry was discovered by serial sectioning

and SEM of internal structures (Burger 2010). The same may apply to the three Panjange spiders with

male asymmetric genitalia described herein. In two of them (Pa. malagos Huber sp. nov.; Pa. camiguin

Huber sp. nov.), the female genitalia appear symmetric; in the third (Pa. casaroro Huber sp. nov.), it is

not clear if the apparent asymmetry is an artifact of preparation or not. Further anatomical study with

adequate sample sizes is needed to evaluate female symmetry vs. asymmetry in these species.

Sexually dimorphic eye-stalks have been studied in much detail in stalk-eyed flies (e.g., Burkhardt &

de la Motte 1988; Wilkinson & Dodson 1997; Panhuis & Wilkinson 1999; Baker & Wilkinson 2001).

For these insects, the general consensus is that sexual selection in the context of a resource-defense

38

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

mating system has been the driving force in the repeated evolution of exaggerated male eye stalks, both

by male-male competition and by female choice. In linyphiid spiders, modifications of the male “head”

are apparently always accompanied by glands that discharge their products through pores easily visible

in the SEM (Schaible et al. 1986). Sexual selection by female choice (via gustatorial courtship) is the

most plausible explanation for this group of spiders (Vanacker et al. 2003; Kunz et al. 2012), but the few

species with real eye stalks (such as Walckenaeria acuminata Blackwall, 1833) have never been studied

in detail. The same is unfortunately true of certain theridiid spiders with similar long eye stalks [e.g.,

Phoroncidia longiceps (Keyserling, 1886); see Levi 1964]. In Pholcidae, nothing is known about the use

of the highly sexually dimorphic eye stalks. Glands and pores have been found in the male eye turrets of

Modisimus culicinus (Simon, 1893) (Huber 1997a) but in none of the Panjange spiders studied herein

and in none of the stalk-eyed Pholcus studied previously with the SEM (Huber 2011). Neither fights

nor matings have ever been observed in any Panjange species or in any stalk-eyed Pholcus. The facts

that these spiders were hard to find at all localities and that the low abundance seemed to result from the

rarity of suitable large leaves suggest that a resource-defense mating system like in stalk-eyed flies is a

plausible working hypothesis for future studies.

Elongated genital structures in spiders are widespread, but it is usually the male intromittent structures

and the corresponding female internal ducts that become long and exaggerated. In most cases, this

concerns the sperm transfer organ (the embolus) and the corresponding insemination ducts (reviewed

in Eberhard & Huber 2010). However, other intromittent structures may go through analogous

developments, as for example male procursus and female uterus externus folds in Mesabolivar yuruani

(Huber, 2000) (see Huber 2006; under Kaliana yuruani ); or male tibia apophysis and a novel female

tubular system in Hortipes gigapophysalts Jocque, Bosselaers & Henrard, 2012 (Jocque et al. 2012).

In Filistatidae, it is the basal palpal segments rather than the intromittent embolus that may become

elongated (Marusik & Zamani 2015). In this group, cannibalism might appear a plausible explanation

because the long palp allows the male body to remain out of reach for the female jaws (e.g., Gerhardt

1928, fig. 2). However, observations have suggested female cooperation rather than aggression (Gerhard

1928, 1930). In Panjange spiders, elongation likewise involves male structures that are very likely not

inserted into the female. Instead, the palpal elongation in this group appears related to the extensible

scape in the female. Both in Calapnita and in Panjange , the species with the longest male palps also

have the longest female scapes ( Calapnita semengoh Huber, 2011; Pa. hamiguitan Huber sp. nov.). This

suggests that males and females may be engaged in an arms race (cf. Kuntner et al. 2009), with ever

longer scapes requiring ever longer palps. The fact that pholcid chelicerae contact the female during

copulation in all cases studied (reviewed in Huber 1999) suggests that palpal elongation is not related

to cannibalism avoidance by keeping the body far from the female. In sum, a wide variety of factors

may lead to genital elongation in spiders, but direct functional observations are almost entirely missing.

Acknowledgements

We thank our driver Vicente Bulongon for bringing us safely to all requested places; the students Mae

A. Responte, Maria B.R. Dacar, Eddie R Mondejar and Philip N.O. Banaag II for help in the field and

for contributing specimens from their own research; Matjaz Kuntner and an anonymous reviewer for

co mm ents that helped improve the manuscript; the Department of Enviro nm ent and Natural Resources

(DENR) CARAGA, DENR Region X, and DENR Region XI for issuing the relevant permits; and the

German Research Foundation for financial support (DFG Project HU 980/11-1).

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Manuscript received: 24 August 2015

Manuscript accepted: 13 October 2015

Published on: 28 December 2015

Topic editor: Rudy Jocque

Desk editor: Charlotte Thionois

Printed versions of all papers are also deposited in the libraries of the institutes that are members of the

EJT consortium: Museum national d’Histoire naturelle, Paris, France; Botanic Garden Meise, Belgium;

Royal Museum for Central Africa, Tervuren, Belgium; Natural History Museum, London, United

Kingdom; Royal Belgian Institute of Natural Sciences, Brussels, Belgium; Natural History Museum of

Denmark, Copenhagen, Denmark.

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HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Appendix 1. Data matrix for cladistic analysis. Taxa are arranged as in the cladogram in Fig. E

Terminals and characters are detailed in Appendices 2 and 3. - = non-applicable; ? = unknown or coding

ambiguous. This matrix is available online at www.pholcidae . de/matrices,html

Quamtana sp.

Pholcus phalangioides

Pholcus debilis

Pholcus phui

Pholcus diopsis

Pholcus atrigularis

Pholcus minang

Pa. Bor 96

Pa. Bor 11

Pa. bako

Pa. Bor 78

Pa. sedgwicki

Pa. iban

Pa. nigrifrons

Pa. Bor 100

Pa. Bor 109

Pa. cavicola

Pa. alba

Pa. mirabilis

Pa. madang

Pa. dubia

Pa. lanthana

Pa. malagos Huber sp. nov.

Pa. casaroro Huber sp. nov.

Pa. camiguin Huber sp. nov.

Pa. hamiguitan Huber sp. nov.

Pa. isarog Huber sp. nov.

Pa. dinagat Huber sp. nov.

Pa. marilog Huber sp. nov.

5 10 15 20 25

- 0000000 - 000 - 0001000--0

- 0000000 - 000 - 0000000--0

- 0000000 - 000 - 0000000--0

- 001 - 0010000 - 0001000--0

00001000 - 000 - 0000000--0

00001000 - 000 - 0000000--0

00001000 - 000 - 0000000--0

00001001000100001000--0

00001001100100001000--0

00001001100100001000--1

00001001100100001000--1

0000100110010001100 ????

- 0001001100100011000--1

-0001001100110011000 — 1

-0001001100100111000 — 1

-0001001100100111000 — 1

0001 - 000 - 01 ??? 001 ? 0100 ?

0001 - 000-11110001001000

0001 - 000-11110001001000

0001 - 000-11110001001000

0001 - 000-11110001001000

- 001 - 000-01101001011000

0001 - 100-01101001011001

1001 - 100-01101001011000

1001 - 100-01101001011000

0001 - 000-11001001011000

0011 - 000 - 000-1001111100

0111 - 010 - 000-1001111110

0111 - 010 - 000-1001111110

01 -

01 -

01 -

01 -

000

000

000

000

000

000

000

000

01 -

01 -

01 -

01 -

001

001

001

001

001

01 -

001

101

101

000

001

001

001

43

European Journal of Taxonomy 169: 1—46 (2015)

Appendix 2. Terminal taxa scored for the cladistic analysis, with origin and depository. Taxa are arranged

as in the cladogram in Fig. 1. Collection codes used in this appendix only: AMNH = American Museum

of Natural History, New York; IRSB = Institut Royal des Sciences Naturelles de Belgique, Brussels;

MZPW = Museum of the Institute of Zoology, Polish Academy of Science, Warsaw; QMB = Queensland

Museum, Brisbane; RMNH = Netherlands Centre for Biodiversity Naturalis, Leiden.

Outgroups

Quamtana sp.: for the present matrix, all known species of Quamtana Huber, 2003 share the same coding.

For this reason, no particular species is specified.

Pholcusphalangioides (Fuesslin, 1775): Germany, Bonn (ZFMK)

Pholcus debilis (Thorell, 1899): Cameroon, Mt. Koupe (ZFMK)

Pholcus phui Huber, 2011: Thailand, Hala Bala WS (ZFMK)

Pholcus diopsis Simon, 1901: Thailand, Wat Kuhapimulc (ZFMK)

Pholcus atrigularis (Simon, 1901): Malaysia, Ulu Dong (ZFMK)

Pholcus minang Huber, 2011: Indonesia, Sumatra, KerinciN.P. (RMNH)

Panjange

Pa. Bor 96: Malaysia, Sarawak, Pueh (ZFMK)

Pa. Bor 11: Malaysia, Sarawak, Niah (ZFMK)

Pa. bako Huber, 2011: Malaysia, Sarawak, Bako (RMNH)

Pa. Bor 78: Malaysia, Sarawak, Kapit (ZFMK)

Pa. sedgwicki Deeleman-Reinhold & Platnick, 1986: Malaysia, Sarawak, nr Kapit (AMNH)

Pa. iban Huber, 2011: Malaysia, Sarawak, Semengoh (ZFMK)

Pa. nigrifrons Deeleman-Reinhold & Deeleman, 1983: Indonesia, Kalimatan, Sepaku (RMNH)

Pa. Bor 100: Malaysia, Sarawak, Penrissen (ZFMK)

Pa. Bor 109: Malaysia, Sarawak, Kubah (ZFMK)

Pa. cavicola Deeleman-Reinhold & Deeleman, 1983: Indonesia, Sulawesi, nr Camba (RMNH)

Pa. alba Deeleman-Reinhold & Deeleman, 1983: Indonesia, Sulawesi (RMNH)

Pa. mirabilis Deeleman-Reinhold, 1986: Australia, Queensland, Gordon Creek (QMB)

Pa. rnadang Huber, 2011: Papua New Guinea, Baiteta (IRSB)

Pa. dubia (Kulczynski, 1911): Indonesia, New Guinea (RMNH, MZPW)

Pa. lanthana Deeleman-Reinhold & Deeleman, 1983: Philippines, Luzon, Mt. Isarog (ZFMK)

Pa. malagos Huber sp. nov.: Philippines, Mindanao, Malagos (ZFMK)

Pa. casaroro Huber sp. nov.: Philippines, Negros, Casaroro Falls (ZFMK)

Pa. camiguin Huber sp. nov.: Philippines, Camiguin, Katibawasan Falls (ZFMK)

Pa. hamiguitan Huber sp. nov.: Philippines, Mindanao, Mt. Hamiguitan (ZFMK)

Pa. isarog Huber sp. nov.: Philippines, Luzon, Mt. Isarog (ZFMK)

Pa. dinagat Huber sp. nov.: Philippines, Dinagat, Paragua (ZFMK)

Pa. marilog Huber sp. nov.: Philippines, Mindanao, Baganihan (ZFMK)

44

HUBER B.A. & NUNEZ A O.M., Evolution of Panjange spiders

Appendix 3. Characters scored for cladistic analysis.

Male prosoma

1. Eye stalks: (0) short, i.e. up to 3 x as long as wide; (1) long, i.e. more than 6 x as long as wide.

Extremely long eye stalks are shared by Pa. casaroro Huber sp. nov. and Pa. camiguin Huber sp.

nov. (Figs 28, 35).

2. Pointed processes arising from near PME: (0) present (e.g.. Figs 17, 28, 66); (1) absent. Such

processes occur in Panjange and in several species currently included in Pholcus (Huber 2011).

They are thus considered plesiomorphic for Panjange , where they have been secondarily lost in Pa.

lanthana and within the nigrifrons group.

3. Ocular pointed processes, shape: (0) straight or slightly curved (Fig. 66); (1) strongly curved or

hooked (Figs 48, 87). Strongly curved ocular processes unite the Panjange cavicola and lanthana

groups. In Pa. hamiguitan Huber sp. nov. the processes are considered secondarily straight.

4. Ocular pointed processes, tips: (0) not contacting each other; (1) contacting and parallel to each

other. The unique configuration of the two processes forming an apparent functional unit (the dorsal

one lying in a groove of the ventral one) is shared by Pa. casaroro Huber sp. nov. and Pa. camiguin

Huber sp. nov. (Figs 48, 49). The processes are similar in Pa. bukidnon Huber sp. nov. (Fig. 90) but

there the tips lie simply side by side.

5. Ocular area, strong hairs on frontal side: (0) absent; (1) present. Strong hairs (Fig. 84; in addition to

spines more distally on the clypeus, see character 6) are shared by Pa. dinagat Huber sp. nov. and

Pa. marilog Huber sp. nov.

6. Clypeus spines: (0) absent; (1) present. The presence of such spines (Figs 84, 85) is a synapomorphy

of Pa. isarog Huber sp. nov.. Pa. dinagat Huber sp. nov., and Pa. marilog Huber sp. nov.

7. Distal cheliceral apophyses: (0) present; (1) absent. The absence of distal cheliceral apophyses

unites the Panjange cavicola and lanthana groups.

8. Distal cheliceral apophyses, shape: (0) simple; (1) bipartite. A bipartite apophysis characterizes the

Panjange nigrifrons group as well as several outgroup species (. Pholcus diopsis; Pholcus atrigularis\

Pholcus minang ) (e.g., figs 476, 640, 664, 690 in Huber 2011). It is thus considered plesiomorphic

for Panjange.

Male palps

9. Pedipalp asymmetry: (0) absent; (1) present. Asymmetry is here interpreted as having evolved once,

uniting three species in the southern Philippines {Pa. malagos Huber sp. nov.. Pa. casaroro Huber

sp. nov., and Pa. camiguin Huber sp. nov.).

10. Trochanter, retrolatero-ventral apophysis: (0) absent or with simple tip; (1) with complex bifid tip

and subdistal prolateral side-branch (Figs 75, 80). A complex retrolatero-ventral apophysis unites

Pa. dinagat Huber sp. nov. and Pa. marilog Huber sp. nov.

11. Femur ventral apophysis: (0) absent; (1) present. A distinct ventral process (rather than just a bulging

area) characterizes the Panjange nigrifrons group (e.g., figs 470, 490 in Huber 2011) and is here

interpreted to have evolved independently in Pholcus phui.

12. Femur ventral apophysis, shape: (0) about as long as wide and not directed toward distal; (1) longer

than wide and directed toward distal (e.g., figs 470, 490 in Huber 2011). A relatively long apophysis

unites most species of the Panjange nigrifrons group.

13. Tibia shape: (0) not elongated, i.e. less than 3 x as long as wide; (1) elongated, i.e. more than 3 x as

long as wide. An elongated tibia characterizes most species of the Panjange cavicola group (except

Pa. cavicola itself) and has independently evolved in a much more extreme way in Pa. hamiguitan

(Figs 64, 65).

14. Tarsal elongation: (0) absent or short (less than 1.5 x as long as wide at basis) (Figs 70, 75, 80); (1)

long (longer than 2 x as long as wide) (e.g., Figs 19, 39, 65). A strong elongation of the tarsus unites

the Panjange cavicola and lanthana groups, but a reversal occurs within the lanthana group, uniting

Pa. isarog Huber sp. nov., Pa. dinagat Huber sp. nov., and Pa. marilog Huber sp. nov.

45

European Journal of Taxonomy 169: 1-46 (2015)

15. Procursus ridges: (0) absent; (1) present (e.g., Figs 18, 26, 52). A series or parallel ridges on the

procursus has been proposed as a synapomorphy of Panjange before (Huber 2011). In some of the

newly described species, these ridges are (apparently secondarily) either indistinct or even absent

(Pa. hamiguitan Huber sp. nov., Pa. isarog Huber sp. nov., Pa. dinagat Huber sp. nov., and Pa.

marilog Huber sp. nov.).

16. Procursus ridges, number: (0) many; (1) only 2-3. Many ridges occur in most species of the

Panjange nigrifrons group (e.g., figs 470, 490 in Huber 2011) except in Pa. nigrifrons itself and in

several species of the lanthana group (e.g., Figs 18, 26, 52). This condition is thus interpreted to be

plesiomorphic for Panjange. Other than in Pa. nigrifrons , a reduction has occurred in the cavicola

group (the condition in Pa. cavicola is not clear).

17. Procursus ventral process: (0) absent; (1) present. This process seems to unite the Panjange lanthana

group. It is very distinct in some species (Pa. lanthana , see fig. 437 in Huber 2011; Pa. casaroro

Huber sp. nov., Fig. 27; Pa. hamiguitan Huber sp. nov.. Fig. 65; Pa. isarog Huber sp. nov., Fig. 70;

Pa. dinagat Huber sp. nov., Fig. 75; Pa. marilog Huber sp. nov., Fig. 80), but indistinct in others

(Pa. malagos Huber sp. nov., Fig. 19; Pa. camiguin Huber sp. nov., Fig. 42).

18. Procursus retrolateral transversal sclerite: (0) absent; (1) present. A distinctive transversal sclerite

characterizes two undescribed species closely related to Panjange nigrifrons.

19. Procursus tip, shape: (0) not flat and widened; (1) flat and widened. A flat and widened procursus tip

(e.g., fig. 470 in Huber 2011; fig. 3 in Deeleman-Reinhold & Platnick 1986) unites several species

of the Panjange nigrifrons group.

20. Uncus on genital bulb: (0) absent; (1) present. Most Pholcus species have a distinct bulbal sclerite in

addition to the appendix, the so-called uncus. Since Panjange seems to be nested within a currently

paraphyletic Pholcus (Huber 2011), the absence of an uncus in Panjange is here considered to be

secondary. This reduction has been suggested as a potential synapomorphy of Panjange before

(Huber 2011), but Pholcus phui (and other species not included in the matrix) share this absence and

may be closer to Panjange than suggested by the cladogram in Fig. 1.

21. Toothed sclerotized process of proximal bulbal sclerite: (0) absent; (1) present. This sclerite (Figs 69,

74, 79) unites three species in the Panjange lanthana group (Pa. isarog Huber sp. nov., Pa. dinagat

Huber sp. nov., and Pa. marilog Huber sp. nov.). It reminds of an uncus but is here considered a

novel structure because it is situated behind the embolus (in prolateral view), while the uncus is

situated in front of the embolus.

22. Embolus, direction: (0) parallel to appendix; (1) in opposite direction than appendix. An embolus

that points in the opposite direction than the appendix (e.g., Figs 18, 64, 69) is a highly unusual

character and is here considered a (strong) synapomorphy of the Panjange lanthana group.

Female genitalia

23. Scape: (0) absent or short, not strongly folded; (1) present, strongly folded and extensible. A strongly

folded and extensible scape (e.g., Figs 22, 67, 72) unites the Panjange cavicola and lanthana groups.

24. Scape, direction: (0) toward posterior; (1) toward anterior. Three species of the Panjange lanthana

group (Pa. isarog Huber sp. nov., Pa. dinagat Fluber sp. nov., Pa. marilog Huber sp. nov.) are united

by a scape that is directed toward anterior (Figs 72, 77, 82).

25. Scape, widening: (0) absent; (1) present. Two species of the Panjange lanthana group (Pa. dinagat

Huber sp. nov., Pa. marilog Huber sp. nov.) are united by a scape that has a distinctive widened area

at about half its length (Figs 77, 82).

26. Female internal genital folds: (0) absent or weakly developed; (1) strongly developed. Most species

of the Panjange nigrifrons group share a system of strongly developed folds of unknown significance

in the female internal genitalia (e.g., figs 473 and 492 in Huber 2011).

46