Pholcus buatong 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: 38-43
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|Pholcus buatong Huber|
Pholcus buatong Huber , sp. nov.
Easily distinguished from known congeners by morphology of male palps ( Figs 154–155View Figs 154 – 158; unique shape of procursus with transversal sclerotized ridges on retrolateral side and complex processes on prolateral side; slender appendix) and by internal female genitalia (large lateral sclerites; shape and position of pore plates; Figs 158View Figs 154 – 158, 186View Figs 184 – 192). From most congeners (except putatively closest relatives Ph. satun and Ph. schwendingeri ) also by dorsally uniquely widened male palpal patella ( Fig. 155View Figs 154 – 158) and by large sclerotized ‘knob’ on female external genitalia ( Fig. 184View Figs 184 – 192).
The species name is derived from one of the localities where this species was found; noun in apposition.
THAILAND: holotype, ♂, ZFMK ( Ar 15044), Krabi , near Khao Phanom Bencha National Park, Tham Khao Phueng (8°14.16’ N, 98°54.26’ E), 45 m a.s.l., on walls in cave, 8 Mar. 2015 (B.A. Huber, B. Petcharad)GoogleMaps .
Other material examined
THAILAND: 9 ♂♂, 3 ♀♀, 1 juv., ZFMK (8 ♂♂, 2 ♀♀, Ar 15045) andGoogleMaps PSUZC (1 ♂, 1 ♀), same data as holotypeGoogleMaps ; 2 ♂♂, 3 ♀♀, in absolute ethanol, ZFMK ( Mal 335), same dataGoogleMaps ; 3 ♂♂, 1 ♀, ZFMK ( Ar 15046), ~ 10 km N Krabi town, Tham Buatong (8°10.83' N, 98°53.06' E), 50 m a.s.l., on cave walls, 7 Mar. 2015 (B.A. Huber, B. Petcharad)GoogleMaps ; 3 ♀♀, in absolute ethanol, ZFMK ( Mal 332), same dataGoogleMaps .
MEASUREMENTS. Total body length 4.0, carapace width 1.0. Leg 1: 44.3 (10.4 + 0.4 + 10.5 + 21.2 + 1.8), tibia 2: 7.1, tibia 3: 4.2, tibia 4: 5.9; tibia 1 L/d: 120. Distance PME-PME 370 µm, diameter PME 90 µm, distance PME-ALE ~35 µm; AME absent.
COLOR. Carapace pale ochre-grey with light brown posterior mark, ocular area with small median and pair of lateral brown marks; clypeus not darkened; sternum pale gray with small very indistinct darker marks; legs ochre-yellow with darker brown patellae and tibia-metatarsus joints; abdomen ochre-gray with some black and indistinct whitish marks dorsally and laterally, monochromous ventrally.
BODY. Habitus as in Figs 143–144View Figs 143 – 152; ocular area slightly raised and each triad on short stalk directed obliquely dorsad ( Fig. 159View Figs 159 – 168); carapace without median furrow; clypeus unmodified; sternum wider than long (0.60/0.50), unmodified. Gonopore with four epiandrous spigots ( Fig. 167View Figs 159 – 168). ALS with one widened, one pointed, and six smaller cylindrically shaped spigots of varying sizes ( Fig. 166View Figs 159 – 168).
CHELICERAE. As in Fig. 156View Figs 154 – 158, barely modified, very indistinct frontal humps.
PALPS. As in Figs 154–155View Figs 154 – 158; coxa unmodified; trochanter with long ventral apophysis and small hump at its basis; femur with small retrolatero-dorsal process proximally ( Fig. 162View Figs 159 – 168) and rounded protrusion ventrally; patella dorsally characteristically widened, resulting in an angle between femur and patella of ~120° (lateral view); procursus very distinctive and complex, with transversal sclerotized ridges on retrolateral side and complex processes on prolateral side ( Figs 162–164View Figs 159 – 168); bulb elongate, with strong proximal sclerite, slender and simple appendix ( Fig. 161View Figs 159 – 168), without uncus, with long weakly sclerotized embolus distally transparent.
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; tarsus 1 with> 20 pseudosegments, very indistinct. Tarsus 4 comb-hairs of the simplified Pholcus - type (cf. Huber & Fleckenstein 2008), with four lateral tines ( Fig. 168View Figs 159 – 168).
Tibia 1 in 10 other males: 8.9–10.4 (mean 9.7).
In general similar to male ( Fig. 145View Figs 143 – 152) but eye triads on low humps and closer together ( Fig. 160View Figs 159 – 168; PME- PME distance: 200 µm). Tibia 1 in 5 females: 6.4–8.5 (mean 7.3). Epigynum weakly sclerotized flat plate with large conspicuous sclerotized ‘knob’ ( Fig. 165View Figs 159 – 168), anterior arch and lateral internal sclerites visible through cuticle ( Figs 157View Figs 154 – 158, 184–185View Figs 184 – 192); internal genitalia as in Figs 158View Figs 154 – 158 and 186View Figs 184 – 192, with large lateral sclerites and oval pore plates in rather anterior position.
At Buatong Cave, most specimens were found in barely visible domed webs close to the rock surface. Only one specimen had its body tightly pressed against the rock surface. At Khao Phueng Cave, specimens were abundant in the cave entrance area (again in very fine webs) but not deeper in the cave.
Germany, Bonn, Zoologische Forschungsinstitut und Museum "Alexander Koenig"
USA, Florida, Gainesville, University of Florida, Florida Museum of Natural History, Allyn Museum
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