Ischnothyreus yuanyeae sp. nov. (Figs 9–11) Type material: 1 male Holotype (IZCAS Ar 19332), sifting leaf litter, China: Hainan, Limushan Natural Reserve, Qulinggulin Garden, July 12, 2007, leg. Chunxia Wang; 1 female Paratype (IZCAS Ar 19341), China: Hainan, Limushan Natural Reserve, Old Botanical Garden, May 3, 2011, leg. Yuanye Zhou; 1 female paratype (IZCAS Ar 19342), China: Wuzhishan Natural Reserve, August 8, 2007, leg. Shuqiang Li. Etymology: The species is named after miss Yuanye Zhou, who collected the type specimens. Diagnosis: The new species is similar to I. matang Kranz-Baltensperger, 2011, but can be distinguished by the shape of the atrium (Figs 10 D, E), the small ventral lobe on the male palpal bulb and the prominent process at the base of the male cheliceral fangs (Figs 10 F–H). Description: Male (holotype). Total length 1.48 mm. Carapace: pale orange on dorsal surface, brown on sides, with egg-shaped patches behind eyes, oval in dorsal view, pars cephalica strongly elevated in lateral view, dorsal surface smooth, sides finely 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 one larger denticle (Figs 10 C, H). Anterior margin of labium not indented at middle. Anteromedian tip of endites with one strong, tooth-like projection. Abdomen: Posterior spiracles not connected by groove. Pedicel tube short, unmodified, scutum extending far dorsal of pedicel. Dorsal scutum covering about 1/2 of abdomen, about 1/3 abdomen width, not fused to epigastric scutum. Epigastric and postepigastric scutum weakly 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, not enlarged; cymbium brown, not fused with bulb, bulb brown, about 2 times as long as cymbium, stout, tapering apically, with two ventral protuberance (vpr), at the bending site with a small lobe (Figs 10 A, B, F, G). Female (paratype). Total length 1.58 mm. As in male except as noted. Carapace: without any pattern, pars cephalica slightly elevated in lateral view. Mouthparts: chelicerae and endites unmodified. Abdomen: dorsal scutum very small. Postepigastric scutum not fused to epigastric scutum, without short posteriorly directed lateral apodemes. Genitalia: the posterior margin of the epigastric scutum is lined with numerous needle-like setae; in the middle of the anterior margin of the postepigastric scutum runs a strongly winding tube (wt), ending in boat-shaped atrium (atr) (Figs 10 D, E, I, J). Distribution: Known only from Hainan Island.

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 35-38, DOI: 10.5281/zenodo.215355