Ischnothyreus yuanyeae, Tong, Yanfeng & Li, Shuqiang, 2012

Tong, Yanfeng & Li, Shuqiang, 2012, Four new species of the genus Ischnothyreus from Hainan Island, China (Araneae, Oonopidae), Zootaxa 3352, pp. 25-39 : 35-38

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.

Figures

FIGURE 9. Ischnothyreus yuanyeae sp. nov., A – D, male; E – J, female. A, E, habitus, dorsal view; B, F, habitus, lateral view; C, prosoma, dorsal view; D, prosoma, lateral view; G, habitus, ventral view; H, prosoma, frontal view; I, prosoma, ventral view; J, abdomen, ventral view. Scales: A, B, E – G = 0.4 mm; C, D, H – J = 0.2 mm.

FIGURE 10. Ischnothyreus yuanyeae sp. nov., A – C, F – H, male; D, E, I, J, female. A, F, left palp, prolateral view; B, G, left palp, retrolateral view; C, H, left chelicera, anterior view; D, I, genital area, ventral view; E, J, genital area, dorsal view. atr, atrium; l, lobe; ssp, slightly sclerotized process; vp, ventral projection; vpr, ventral protuberance; wt, winding tube. Scales: A – E = 0.05 mm; F – H, J = 0.1 mm; I = 0.2 mm.

FIGURE 11. Localities of four new Ischnothyreus species from Hainan Island, China.