Terrilimosina dentata Cao, Dong & Yang, 2025, sp. nov.

Terrilimosina dentata sp. nov. Figs 1 b, 10, 11 Type locality. China, Xizang: Yadong, Zhongyinkou’an, 3610 m, 14. vii. 2018, Liang Wang. Type material. Holotype: China: - Xizang: • ♂; Yadong, Zhongyinkou’an; 3610 m, 14.vii.2018; Liang Wang; in alcohol. (EMCAU). Diagnosis. Arista ~ 5.7 × as long as postpedicel. Hind basitarsomere with one thin anteroventral bristle basally, one slightly flattened anterodorsal bristle apically and one very small ventral spine subapically. Syntergite 1 + 2 well sclerotized. Sternite 5 with sparse posterior setae, eight robust tooth-like bristles at middle and patch of dense posteromedial setulae (Fig. 11 d). Postgonite sinuate, with sharp apex and ~ 3 setae at middle (Fig. 11 c). Description. Male (Fig. 10 a). Body length 1.7 mm, wing 1.8 mm. General color brown. Eye height 2.0 × genal height at point of maximum eye height. One very long vibrissa. Arista ~ 5.7 × as long as postpedicel. Thorax black. Mid tibial chaetotaxy as in Fig. 10 b, c, ventrally with one very short anteroventral bristle below middle and one longer apical bristle; hind basitarsomere with one thin anteroventral bristle basally, one slightly flattened anterodorsal bristle apically and one very small ventral spine subapically. Wing (Fig. 1 b) infuscate, pale brownish; C-index = 1.0; r-m – dm-m: dm-m = 3.8. Tergites and sternites sparsely and shortly setulose. Syntergite 1 + 2 well sclerotized. Sternite 5 with sparse posterior setae, eight robust tooth-like spines at middle and patch of dense posteromedial setulae (Fig. 11 d). Male genitalia. Epandrium (Fig. 11 a, b) sparsely and shortly setulose. Cercus broad triangular, with a long bristle subapically, some short setae and dense setulae apically (Fig. 11 a, b). Surstylus with sharp anterior process, a curved comb-like row of bristles surrounded by dense setae, dense setulae posterodorsally and a long inner-posterior tooth-like spine (Fig. 11 a, b). Basiphallus short, with round posterior margin (Fig. 11 c). Postgonite sinuate, with sharp apex and ~ 3 setae at middle (Fig. 11 c). Distiphallus with a weakly sclerotized and apically sharp dorsal part covering a well sclerotized ventral part with a ventral process and ear-like dorsal process, apex with a long and weakly sclerotized process basally covered by membranous sheet with serrate margins (Fig. 11 c). Female. Unknown. Etymology. The specific name is derived from the Latin dentatus (dentate), and refers to the robust spines on the male S 5. Distribution. China (Shanxi, Xizang, Yunnan). Comments. Terrilimosina dentata sp. nov. resembles T. nana Hayashi, from which it differs in having the male S 5 with eight robust tooth-like spines medially and a patch of dense posteromedial setulae (Fig. 11 d), surstylus with a curved comb-like row of bristles surrounded by dense setae and a long inner-posterior tooth-like spine (Fig. 11 a, b). Terrilimosina nana Hayashi has two patches of short, stout posterior bristles on the male S 5 (Fig. 19 d) and two short, blunt bristles on the apex of the posteroventral lobe of the surstylus (Fig. 19 a, b).