Pholcus krabi Huber

Berhard A. Huber, Booppa Petchard, Charles Leh Moi Ung, Joseph K. H. Koh & Amir R. M. Ghazali, 2016, The Southeast Asian Pholcus halabala species group (Araneae, Pholcidae): new data from field observations and ultrastructure, European Journal of Taxonomy 190, pp. 1-55: 28-30

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Pholcus krabi Huber

sp. nov.

Pholcus krabi Huber  , sp. nov.

Figs 102–105 View Figure , 111–123View Figs 111 – 115View Figs 116 – 123, 134–136 View Figure


Distinguished from similar species (other species in the Ph. krabi  group) by morphology of male palps ( Figs 111–112 View Figure ; unique shapes of small uncus and small appendix; distinctive procursus with prolateral process ending in heavily sclerotized tip) and by distinctive pair of small dark internal structures in internal female genitalia (arrow in Fig. 114 View Figure ).


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

Type material

THAILAND: holotype, ♂, ZFMK ( Ar 15035), Krabi  , Khao Phanom Bencha National Park, trails near headquarters (8°14.6' N, 98°55.0' E), 110 m a.s.l., domed webs among forest vegetation, 8 Mar. 2015 (B.A. Huber, B. Petcharad)GoogleMaps  .

Other material examined

THAILAND: 3 ♂♂, 4 ♀♀, ZFMK ( Ar 15036–37), same data as holotypeGoogleMaps  ; 2 ♀♀, 4 juvs, in absolute ethanol, ZFMK ( Mal 338), same dataGoogleMaps  ; 2 ♂♂, 5 ♀♀, ZFMK ( Ar 15038–39), Surat Thani, Khao Sok National Park, forest along nature trail (8°54.8' N, 98°29.3'– 98°30.5' E), domed webs among vegetation, 110–160 m a.s.l., 11–12 Mar. 2015 (B.A. Huber, B. Petcharad)GoogleMaps  ; 3 ♀♀, in absolute ethanol, ZFMK ( Mal 357), same dataGoogleMaps  ; 2 ♂♂, 3 ♀♀, ZFMK ( Ar 15040), Ranong, Klong Nakha Wildlife Sanctuary (9°27.6' N, 98°30.7' E), 40 m a.s.l., forest, domed webs among vegetation, 12 Mar. 2015 (B.A. Huber, B. Petcharad)GoogleMaps  ; 3 ♀♀, in absolute ethanol, ZFMK ( Mal 363), same dataGoogleMaps  .


Male (holotype)

MEASUREMENTS. Total body length 4.1, carapace width 0.95. Leg 1: 34.8 (8.3 + 0.4 + 8.3 + 15.5 + 2.3), tibia 2: 5.2, tibia 3: 2.9, tibia 4: 4.5; tibia 1 L/d: 86. Distance PME-PME 375 µm, diameter PME 105 µm, distance PME-ALE ~35 µm; AME absent.

COLOR. Carapace pale ochre to whitish with small dark median mark, ocular area and clypeus with light brown pattern; sternum whitish; palps reddish; legs pale ochre to whitish with brown patellae and tibia-metatarsus joints; abdomen pale gray with very indistinct darker marks dorsally and laterally, monochromous ventrally.

BODY. Habitus as in Figs 102–103 View Figure ; ocular area slightly raised and each triad on short stalk directed laterad ( Fig. 116 View Figure ); carapace without median furrow; clypeus unmodified; sternum wider than long (0.60/0.48), unmodified. ALS with only two spigots (one widened, one pointed; Fig. 122 View Figure ).

CHELICERAE. As in Fig. 113 View Figure , with large proximal processes and pair of rounded distal apophyses without modified hairs ( Fig. 118 View Figure ).

PALPS. As in Figs 111–112 View Figure ; coxa unmodified; trochanter with long retrolatero-ventral apophysis directed first laterad then bending sharply ventrad ( Fig. 119 View Figure ); femur with small retrolatero-dorsal process; tibia large; procursus with distinctive prolateral process ending in heavily sclerotized tip ( Fig. 120 View Figure ), with sclerotized and membranous pointed processes ventrally; bulb with indistinct prolateral process, strong proximal sclerite, small uncus and small appendix ( Fig. 121 View Figure ), weakly sclerotized embolus.

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 pseudosegments not seen in dissecting microscope. Tarsus 4 comb-hairs of the simplified Pholcus  - type (cf. Huber & Fleckenstein 2008), with five lateral tines ( Fig. 123 View Figure ).

Male (variation)

Tibia 1 in 6 other males: 7.7–8.3 (mean 8.1).


In general similar to male ( Figs 104–105 View Figure ) but eye triads on low humps and closer together ( Fig. 117 View Figure ; PME-PME distance: 220 µm); clypeus and ocular area frontally black; sternum anterior part slightly darker. Tibia 1 in 12 females: 6.3–7.3 (mean 6.8). Epigynum weakly sclerotized slightly bulging plate with semi-transparent posterior ‘knob’, internal anterior arch and distinctive small sclerites visible through cuticle ( Figs 114 View Figure , 134–135 View Figure ); internal genitalia as in Figs 115 View Figure and 136 View Figure , with straight anterior sclerite and oval pore plates.

Natural history

At Phanom Bencha, all eight specimens were collected from two bushes close to each other. Two days of intensive search in various parts of the forest did not result in any further specimens. At Khao Sok, all specimens were found in degraded forest close to the park road; none was found in well preserved forest.


Known from three localities in southern Thailand ( Fig. 110 View Figure ).


Germany, Bonn, Zoologische Forschungsinstitut und Museum "Alexander Koenig"


USA, Florida, Gainesville, University of Florida, Florida Museum of Natural History, Allyn Museum