Pholcus ubin 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 : 10-12
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|Pholcus ubin Huber|
Pholcus ubin Huber , sp. nov.
Easily distinguished from putatively closest known relatives (other species in the halabala core group) by morphology of male palps ( Figs 29–30 View Figs 29 – 33 ; procursus with heavily sclerotized dorsal process distally; shapes of uncus and appendix) and by female internal genitalia ( Figs 32–33 View Figs 29 – 33 ; triangular pore plates).
The species name is derived from the type locality; noun in apposition.
SINGAPORE: holotype, ♂, ZFMK ( Ar 15010 ), Pulau Ubin , degraded forest near park headquarters (1°24.2' N, 103°58.2' E), 20 m a.s.l., on leaves, 16 Feb. 2015 (B.A. Huber, J. Koh, D. Court) GoogleMaps .
Other material examined
MEASUREMENTS. Total body length 4.1, carapace width 1.0. Leg 1: 30.4 (7.3 + 0.4 + 7.2 + 14.2 + 1.3), tibia 2: 4.7, tibia 3: 2.7, tibia 4: 3.9; tibia 1 L/d: 86. Distance PME-PME 220 µm, diameter PME 95 µm, distance PME-ALE ~35 µm; distance AME-AME 35 µm; diameter AME 60 µm.
COLOR. Carapace ochre-yellow with brown pattern of radiating marks posteriorly, in live specimens with reddish color in median area between posterior marks ( Fig. 7 View Figs 1 – 8 ); ocular area and clypeus not darkened; sternum with some dark marks posteriorly; legs ochre-yellow with dark brown patellae and tibiametatarsus joints; abdomen pale ochre-gray with small black and white marks dorsally and laterally, monochromous ventrally.
BODY. Habitus as in Fig. 7 View Figs 1 – 8 ; ocular area slightly raised, with brushes of ~10 stronger hairs behind each PME; carapace without median furrow; clypeus unmodified; sternum wider than long (0.62/0.40), unmodified.
CHELICERAE. As in Fig. 31 View Figs 29 – 33 , with pair of frontal apophyses provided with two modified hairs each and rounded lateral processes.
PALPS. As in Figs 29–30 View Figs 29 – 33 ; coxa unmodified; trochanter with retrolatero-ventral apophysis; femur with small retrolateral apophysis proximally; tibia very large; tarsus with dorsal elongation carrying subdistal tarsal organ; procursus with prominent ventral ‘knee’, with distinctive heavily sclerotized dorsal process distally (arrow in Fig. 30 View Figs 29 – 33 ); bulb oval, with distinctive uncus and appendix; weakly sclerotized embolus with subdistal fringed side branch (hidden by appendix in Fig. 29 View Figs 29 – 33 ).
LEGS. Without spines and curved hairs; few vertical hairs; retrolateral trichobothrium on tibia 1 at 5%; prolateral trichobothrium absent on tibia 1, present on other tibiae; tarsus 1 with ~20 pseudosegments (only distally ~15 fairly distinct).
Tibia 1 in 2 other males: 6.1, 7.3.
In general similar to male ( Fig. 8 View Figs 1 – 8 ), but without stronger hairs behind PME; sternum mostly dark with some small light marks; eye triads closer together than in male (PME-PME distance: 185 µm). Tibia 1 in 3 females: 5.8, 5.9, 6.1. Epigynum weakly sclerotized whitish plate ( Fig. 90 View Figs 90 – 101 ), anterior internal arch visible through cuticle, posterior margin laterally slightly more sclerotized; with median ‘knob’ ( Figs 32 View Figs 29 – 33 , 90–91 View Figs 90 – 101 ); internal genitalia as in Figs 33 View Figs 29 – 33 and 92 View Figs 90 – 101 .
All Pulau Ubin specimens were found in a highly degraded patch of forest near park headquarters, while no specimen was found in a well preserved forest about 3.3 km WNW. Most specimens were collected by beating of branches, but some were observed in their flat resting position on the leaves.
Germany, Bonn, Zoologische Forschungsinstitut und Museum "Alexander Koenig"
Netherlands, Leiden, Nationaal Natuurhistorische Museum ("Naturalis") [formerly Rijksmuseum van Natuurlijke Historie]
USA, Florida, Gainesville, University of Florida, Florida Museum of Natural History, Allyn Museum
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