Pholcus khaolek 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 : 21-24
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|Pholcus khaolek Huber|
Pholcus khaolek Huber , sp. nov.
Easily distinguished from most similar known relative ( Ph. kuhapimuk sp. nov.) by morphology of male palps ( Figs 63–64 View Figs 63 – 67 ; shapes of male palpal tarsus and procursus tip, larger uncus, complex appendix with retrolateral process) and by female internal genitalia ( Figs 66–67 View Figs 63 – 67 ; distinctive median triangular sclerite). From other close relatives also by combination of pale coloration ( Figs 52–53 View Figs 49 – 56 ), shape of male palpal trochanter apophysis (curved, proximally wide, distally pointed; Fig. 64 View Figs 63 – 67 ), and shape and position of pore plates ( Fig. 67 View Figs 63 – 67 ).
The species name is derived from the type locality; noun in apposition.
THAILAND: holotype, ♂, ZFMK ( Ar 15028 ), Nakhon Si Thammarat, Khao Nan National Park, Tham Khao Lek (8°46.09' N, 98°43.68' E), 95 m a.s.l., on rock walls around cave, 10 Mar. 2015 (B.A. Huber, B. Petcharad) GoogleMaps .
Other material examined
MEASUREMENTS. Total body length 4.6, carapace width 1.3. Leg 1: 48.6 (11.6 + 0.6 + 11.7 + 22.8 + 1.9), tibia 2: 7.9, tibia 3: 4.5, tibia 4: 6.3; tibia 1 L/d: 95. Distance PME-PME 340 µm, diameter PME 125 µm, distance PME-ALE ~35 µm; distance AME-AME 50 µm; diameter AME 55 µm.
COLOR. Carapace pale ochre-yellow with pair of light brown marks posteriorly; ocular area and clypeus not darkened; sternum light brown with lighter marks and dark lateral margins; legs ochre-yellow with dark brown patellae and tibia-metatarsus joints; abdomen monochromous ochre-gray.
BODY. Habitus as in Fig. 53 View Figs 49 – 56 ; ocular area slightly raised, with brushes of stronger hairs behind each PME ( Figs 68–69 View Figs 68 – 78 ); carapace without median furrow; clypeus unmodified; sternum wider than long (0.84/0.52), unmodified. ALS with one widened, one pointed, and six smaller cylindrically shaped spigots of varying sizes ( Fig. 78 View Figs 68 – 78 ).
CHELICERAE. As in Fig. 65 View Figs 63 – 67 , with pair of distal frontal apophyses provided with two to three modified (cone-shaped) hairs each ( Fig. 70 View Figs 68 – 78 ), pair of rounded lateral processes, and pair of small indistinct proximal frontal humps.
PALPS. As in Figs 63–64 View Figs 63 – 67 ; coxa unmodified; trochanter with large retrolatero-ventral apophysis; femur proximally widened on ventral side, with small retrolatero-dorsal apophysis; tarsus without dorsal elongation; procursus rather simple ( Figs 71–72 View Figs 68 – 78 ), with prolateral weakly sclerotized process and transparent membranous structures; procursus tip as in Fig. 75 View Figs 68 – 78 ; bulb with distinctive uncus and appendix with retrolateral process ( Fig. 73 View Figs 68 – 78 ); weakly sclerotized short embolus.
LEGS. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 6%; prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with> 30 pseudosegments, distally fairly distinct. Tarsus 4 comb-hairs as in Fig. 71 View Figs 68 – 78 .
Tibia 1 in 5 other males: 10.1–12.8 (mean 11.7). Some males with white marks on abdomen.
In general similar to male ( Fig. 52 View Figs 49 – 56 ) but without stronger hairs behind PME; eye triads closer together than in male (PME-PME distance: 220 µm). Tibia 1 in 5 females: 8.7–10.1 (mean 9.3). Epigynum weakly sclerotized bulging area, only posterior area more strongly sclerotized, with small but distinct ‘knob’ ( Figs 66 View Figs 63 – 67 , 77 View Figs 68 – 78 , 99–100 View Figs 90 – 101 ); internal genitalia as in Figs 67 View Figs 63 – 67 and 101 View Figs 90 – 101 , with anterior arch and distinctive triangular sclerite visible through cuticle.
This species was abundant at the type locality on vertical and slightly overhanging smooth rocks. Specimens were observed tightly pressed against the rock surface, in some cases with a small domed web nearby. When disturbed, the spiders dropped to the ground.
Known from type locality only ( Fig. 57 View Fig. 57 ).
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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