Ischnothyreus xui Tong & Li, 2012, sp. nov.
Creators: name: Tong, Yanfeng
name: Li, Shuqiang
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Oonopidae
Ischnothyreus
Ischnothyreus xui

description: Ischnothyreus xui sp. nov.
(Figs 6–8, 11)
Type material: 1 male Holotype (IZCAS Ar 19320), canopy fogging, China: Hainan, Ledong, Jianfengling Natural Reserve, Alt. 997 m, 18°44.658´N, 108°50.435´E, August 18, 2010, leg. Guo Zheng; 2 males and 1 female paratypes (IZCAS Ar 19320), same data as holotype; 1 female paratype (IZCAS Ar 19321), canopy fogging, China: Hainan, Ledong, Jianfengling Natural Reserve, on the road to Fifth subarea, Alt. 975 m, 18°44.026´N, 108°52.460´E, August 15, 2010, leg. Guo Zheng; 1 female paratype (IZCAS Ar 19322), canopy fogging, China: Hainan, Ledong, Jianfengling Natural Reserve, on the road to Fifth subarea, August 14, 2010, leg. Guo Zheng; 1 female paratype (IZCAS Ar 19335), canopy fogging, Diaoluoshan Natural Reserve, on the road to waterfall, August 10, 2010, leg. Guo Zheng.
Etymology: The specific name is a patronym honoring Professor Yajun Xu, who worked on the Oonopidae of China.
Diagnosis: The new species is similar to I. falcatus Tong & Li, 2008, but can be distinguished by the larger dorsal scutum, the membranous outgrowth on the male palpal bulb, the modifications on the male chelicerae and the shape of the atrium.
Description: Male (holotype). Total length 1.45 mm. Carapace: orange-brown, with brown egg-shaped patches behind eyes, oval in dorsal view, pars cephalica strongly elevated in lateral view, surface and sides strongly reticulate. Eyes: six, in one group, well developed, ALE largest, PME and PLE nearly equal sized; posterior eye row straight from above, procurved from front. Mouthparts: chelicerae slightly divergent, with slightly sclerotized process at base of fangs (ssp); fang groove with a few small and two larger denticles (Figs 6 G, 8C). Anterior margin of labium not indented at middle. Anteromedian tip of endites with one strong, tooth-like projection. Abdomen: ovoid, rounded posteriorly. Posterior spiracles not connected by groove. Pedicel tube short, unmodified, scutum extending far dorsal of pedicel. Dorsal scutum covering about 4/5 of abdomen, about equal to the abdomen width, not fused to epigastric scutum. Epigastric and postepigastric scutum well sclerotized, pale orange, fused. Leg spine formula: femur I with 2 prolateral and 1 small retrolateral spine, tibia I with 4 pairs, metatarsus I with 2 pairs of long ventral spines. Spination of leg II similar to leg I except femur with only one prolateral spine. Legs III and IV spineless. Genitalia: Sperm pore situated at level of anterior spiracles. Palp strongly sclerotized, trochanter with ventral projection (vp); patella as long as femur; cymbium brown, not fused with bulb, bulb brown, about 1.5 times as long as cymbium, stout, tapering apically, with two ventral protuberances (vpr), at the bending site with a small lobe (l), distal part of bulb with membranous outgrowth (mo) (Figs 6 E, F, 8A, B)
Female (paratype). Total length 1.79 mm. As in male except as noted. Carapace broadly oval in dorsal view. Mouthparts: chelicerae and endites unmodified. Abdomen: dorsal scutum covering about 1/2 of abdomen, about 2/ 3 of abdomen width. Postepigastric scutum not fused to epigastric scutum, with short posteriorly directed lateral apodemes. Genitalia: in the middle of the postepigastric scutum is a sclerotized ridge visible (sr), underneath runs a strongly winding tube (wt), ending in a small atrium (atr). A curved sclerotized ridge (csr) is visible in the middle of the epigastric scutum when viewed from dorsal (Figs 7 G, 8E, F).
Distribution: Known only from Hainan Island.
description: Published as part of Tong, Yanfeng & Li, Shuqiang, 2012, Four new species of the genus Ischnothyreus from Hainan Island, China (Araneae, Oonopidae), pp. 25-39 in Zootaxa 3352 on pages 29-35, DOI: 10.5281/zenodo.215355