Ischnothyreus qidaoban Tong & Li, 2021

Tong, Yanfeng, Sun, Xiaochen, Li, Shuqiang & Bian, Dongju, 2021, Taxonomic study of the genus Ischnothyreus (Araneae, Oonopidae) from Xishuangbanna Rainforest, southwestern China, ZooKeys 1034, pp. 165-197 : 165

Ischnothyreus qidaoban Tong & Li sp. nov. Figures 10 , 11 , 12 , 20J-L , 22G, H , 23G, H

Type material.

Holotype ♂: China, Yunnan, Mengla City, Menglun Town, Xishuangbanna Natural Reserve, 55 Km, monsoon forest; 21°57.531'N, 101°11.961'E; 751 m; 13.VI.2013; Q. Zhao and Z. Chen leg. (SYNU-405). Paratypes. 1♂5♀: same data as for holotype (SYNU-406-411); 1♂1♀: Xiaolongha, Xishuangbanna Biodiversity Conservation Corridor, Qidaoban, valley forest; 21°24.808'N, 101°37.874'E; 711 m; 18.VI.2013; Q. Zhao and Z. Chen leg. (SYNU-412-413).

Diagnosis.

The new species is similar to I. auritus Tong & Li, 2012 in the long dorsal scutum of the abdomen and the helmet-shaped sclerotized process of the male cheliceral fang, but can be distinguished by the broad mushroom-like projection (Fig. 20J-L ) of the palp (vs the ear-shaped apophysis in I. auritus ; Tong 2013: fig. 43A, B) and the central oval shaped depression (Figs 12H , 23G ) of epigastric area (vs without external features in I. auritus ; Tong 2013: fig. 43C).

Description.

Male (holotype). Body: habitus as in Fig. 10A-C ; body length 1.58. Carapace: 0.84 long, 0.69 wide; dark brown, with egg-shaped patches behind eyes, surface of elevated portion of pars cephalica finely reticulate, sides strongly reticulate, lateral margin straight, smooth (Fig. 10D, E ). Clypeus: height about equal to ALE diameter (Fig. 10G ). Eyes: (Fig. 10D, G ). Sternum: pale orange (Fig. 10F ). Mouthparts: chelicerae, endites and labium brown; chelicerae straight, base of fangs with helmet-shaped sclerotized process, fang groove with a few small denticles (Figs 10H-J , 22G, H ); anteromedian tip of endites with one strong, tooth-like projection (Fig. 10F ). Abdomen: 0.74 long, 0.46 wide; dorsal scutum well sclerotized, pale orange, covering whole abdomen width and abdomen length, fused to epigastric scutum; epigastric and postgastric scutum well sclerotized, yellow, fused, postgastric scutum covering about 5/6 of the abdomen length (Fig. 10A-C ). Legs: yellow, femur I with 2 prolateral spines, tibia I with 4 pairs, metatarsus I with 2 pairs of long ventral spines. Leg II spination similar to leg I except femur with only 1 prolateral spine. Legs III and IV spineless. Palp: trochanter with ventral projection, cymbium brown; bulb with one small ventral protuberance, distal end of bulb elongated, with one broad mushroom-like projection, retrolateral lobe narrow (Figs 11 , 20J-L ).

Female (paratype, SYNU-407). Same as male except as noted. Body: habitus as in Fig. 12A-C ; body length 1.64. Carapace: 0.77 long, 0.67 wide. Mouthparts: chelicerae and endites unmodified. Abdomen: 0.88 long, 0.65 wide; dorsal scutum covering 5/6 of the abdomen length and about 5/6 of the abdomen width. Epigastric area: postgastric scutum with central oval-shaped depression (Fig. 12C, H ). Endogyne: from the middle of the slightly thickened margin of the postgastric scutum runs a dark, simple winding tube posteriorly (Fig. 23G, H ).

Etymology.

The specific name is a noun in apposition taken from the type locality.

Distribution.

Known only from the localities of the type series.

Figures

Figure 10. Ischnothyreus qidaoban sp. nov., male holotype A-C habitus, dorsal, lateral and ventral views D-G prosoma, dorsal, lateral, ventral and anterior views H-J left chelicerae, anterior, posterior and lateral views. Abbreviation: stp = strong, tooth-like projection. Scale bars: 0.4 mm (A-G); 0.1 mm (H-J).

Figure 11. Ischnothyreus qidaoban sp. nov., male holotype, left palp, SEM A-C prolateral, retrolateral and dorsal views D, E palpal bulb, prolateral and retrolateral views F-H distal part of palpal bulb, dorsal, prolateral and retrolateral views. Abbreviations: mlp = mushroom-like projection; rl = retrolateral lobe.

Figure 12. Ischnothyreus qidaoban sp. nov., female paratype A-C habitus, dorsal, lateral and ventral views D-G prosoma, dorsal, lateral, ventral and anterior views H epigastric region, ventral view. Abbreviation: cd = central oval depression. Scale bars: 0.4 mm (A-G); 0.2 mm (H).

Figure 20. Ischnothyreus spp., left male palp A-C I. cristiformis sp. nov. D-F I. mangun sp. nov. G-I I. mengyang sp. nov. J-L I. qidaoban sp. nov. M-O I. qiuxing A, D, G, J, M prolateral view B, E, H, K, N dorsal view C, F, I, L, O retrolateral view. Scale bars: 0.1 mm (A-F, M-O); 0.2 mm (G-L).

Figure 22. Ischnothyreus spp., left male chelicerae A, B I. cristiformis sp. nov. C, D I. mangun sp. nov. E, F I. mengyang sp. nov. G, H I. qidaoban sp. nov. A, C, E, G anterior view B, D, F, H posterior view. Abbreviations: ccp = cockscomb-shaped process; hsp = helmet-shaped process; lsp = large, sclerotized process.

Figure 23. Endogyne of Ischnothyreus spp., A, B I. cristiformis sp. nov. C, D I. mangun sp. nov. E, F I. mengyang sp. nov. G, H I. qidaoban sp. nov. I, J I. qiuxing A, C, E, G, I ventral view B, D, F, H, J dorsal view. Abbreviations: a = apodemes; bsa = bell-shaped atrium; cd = central oval depression; csa = circular atrium; nsa = nipple-shaped atrium; oa = opening of the atrium; rsa = rectangular-shaped atrium; wt = winding tube. Scale bars: 0.2 mm.