Ischnothyreus spineus, 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 : 29

publication ID

https://doi.org/ 10.5281/zenodo.215355

DOI

https://doi.org/10.5281/zenodo.6166161

persistent identifier

https://treatment.plazi.org/id/039187EA-FF9A-FFA0-F6BC-F2CCFD35DB74

treatment provided by

Plazi (2016-04-12 20:24:26, last updated 2024-11-27 18:13:55)

scientific name

Ischnothyreus spineus
status

sp. nov.

Ischnothyreus spineus View in CoL sp. nov.

( Figs 3–5 View FIGURE 3 View FIGURE 4 View FIGURE 5 , 11 View FIGURE 11 )

Type material: 1 male Holotype ( IZCAS Ar 19319), sifting leaf litter, China: Hainan, Haikou City, Dongzhaigang Mangrove Natural Reserve, Alt. - 2 m, 19°57.113´N, 110°33.983´E, August 20, 2007, leg. Shuqiang Li; 3 female paratypes, same data as holotype.

Etymology: The specific name refers to the strong thorn-like process on the chelicerae; adjective.

Diagnosis: The male can easily be recognized by the flower-like distal part of the palp and the very strong, curved, thorn-like process on the chelicerae ( Figs 3 View FIGURE 3 D, H, 5C). The female can be recognized by the shallow, semicircular depression at the anterior margin of the postepigastric scutum and the sponge-like structure in the genital area ( Figs 4 View FIGURE 4 G, H, 5D, E).

Description: Male (holotype). Total length 1.21 mm. Carapace: orange-brown, without any pattern, broadly oval in dorsal view, pars cephalica slightly elevated in lateral view, surface and sides strongly reticulate. Eyes: six, well developed, ALE largest, PME smallest; posterior eye row procurved from both above and front. Mouthparts: chelicerae slightly divergent, with slightly sclerotized process at base of fangs (ssp) and one strong, curved thornlike process (tlp) in the middle of the laterodorsal surface; fang groove with many small denticles ( Figs 3 View FIGURE 3 H, 5C). Anterior margin of labium not indented at middle. Anteromedian tip of endites with one strong, tooth-like projection. Abdomen: scutum extending far dorsal of pedicel. Dorsal scutum covering about 3/4 of abdomen, about 1/2 of abdomen width, not fused to epigastric scutum. Epigastric scutum weakly sclerotized, postepigastric scutum absent. 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); femur normal size; patella about as long as femur, not enlarged; cymbium not fused with bulb; bulb with two small ventral protuberances (vpr), at the bending site with a lobe (l); tip of bulb with membranous, flower-like outgrowth (flo) ( Figs 3 View FIGURE 3 I, J, 5A, B).

Female (paratype). Total length 1.32 mm. As in male except as noted. Eyes: posterior eye row strongly procurved from above. Mouthparts: chelicerae and endites unmodified. Abdomen: dorsal scutum covering about 1/2 of abdomen, about 1/3 of abdomen width. Postepigastric scutum absent, with short posteriorly directed lateral apodemes. Genitalia: anterior margin of postepigastric scutum with a shallow semi-circular depression (scd), at its middle a tube, with round tip (rt), connected posteriorly to a strongly winding tube (wt); from dorsal view, the tube penetrates through a sponge-like structure (sls), and ends at near the epigastric furrow ( Figs 4 View FIGURE 4 G, H, 5D, E).

Distribution: Known only from Hainan Island.

Gallery Image

FIGURE 3. Ischnothyreus spineus sp. nov., male. A – C, habitus, dorsal, lateral and ventral views; D – G, prosoma, frontal, dorsal, lateral and ventral views; H, left chelicera, anterior view; I, J, left palp, prolateral and retrolateral views. flo, flower-like outgrowth; ssp, slightly sclerotized process; tlp, thorn-like process; vp, ventral projection. Scales: A – C = 0.4 mm; D – G = 0.2 mm; H – J = 0.1 mm.

Gallery Image

FIGURE 4. Ischnothyreus spineus sp. nov., female. A, B, C, habitus, dorsal, lateral and ventral views; D, prosoma, dorsal view; E, prosoma, frontal view; F, abdomen, ventral view; G, genital area, ventral view; H, genital area, dorsal view. rt, tube with round tip; scd, semi-circular depression; sls, sponge-like structure; wt, winding tube. Scales: A, B, C = 0.4 mm; D – F = 0.2 mm; G, H = 0.05 mm.

Gallery Image

FIGURE 5. Ischnothyreus spineus sp. nov. A, left male palp, prolateral view; B, left male palp, retrolateral view; C, left male chelicera, anterior view; D, female genital area, ventral view; E, female genital area, dorsal view. a, apodeme; flo, flower-like outgrowth; l, lobe; rt, tube with round tip; scd, semi-circular depression; sls, sponge-like structure; ssp, slightly sclerotized process; tlp, thorn-like process; vp, ventral projection; vpr, ventral protuberance; wt, winding tube. Scales: 0.1 mm.

Gallery Image

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

IZCAS

Institute of Zoology, Chinese Academy of Sciences

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Oonopidae

Genus

Ischnothyreus