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

Terrilimosina bicruris sp. nov. Figs 1 a, 2, 3 Type locality. China, Xizang: Linzhi, Mt. Sejila, 3745 m, 6.vii.2018, Qicheng Yang. Type material. Holotype: China: - Xizang: • ♂; Linzhi, Mt. Sejila; 3745 m, 6.vii.2018; Qicheng Yang; in alcohol. (EMCAU). Diagnosis. Arista ~ 5.6 × as long as postpedicel. Hind tibia ventrally with one thin apical bristle; hind basitarsomere apically with one short anterodorsal bristle. Syntergite 1 + 2 well sclerotized (Fig. 2 b). S 5 with sparse setulae and three densely setulose posterior process (middle one bifurcated) (Fig. 3 d). Description. Male (Fig. 2 a – d). Body length 1.7 mm, wing 1.8 mm. General color black. Eye height 2.5 × genal height at point of maximum eye height. One long vibrissa. Arista ~ 5.6 × as long as postpedicel. Postgonite with an inner posterior lobe (with a small process medially), a shallow notch preapically and ~ 3 small apical setulae (Fig. 3 c). Mid tibial chaetotaxy as in Fig. 2 c, d, ventrally with one short anteroventral bristle below middle and one longer apical bristle; hind tibia ventrally with one thin apical bristle; hind basitarsomere apically with one short anterodorsal bristle. Wing (Fig. 1 a) infuscate, pale brownish; C-index = 0.9; r-m – dm-m: dm-m = 3.5. Tergites and sternites sparsely and shortly setulose. Syntergite 1 + 2 well sclerotized (Fig. 2 b). Sternite 5 with sparse setulae and three densely setulose posterior process (middle one bifurcated) (Fig. 3 d). Male genitalia: Epandrium (Fig. 3 a, b) sparsely and shortly setose, with a longer dorsolateral bristle. Cercus long and fingerlike, with a long bristle basally and a setae apically (Fig. 3 a, b). Surstylus with a stout comb-like row of ventral bristles internally and some small anterior and posteroventral setae (Fig. 3 a, b). Basiphallus small, with a small posterior process (Fig. 3 c). Postgonite with an inner posterior lobe (with a small process medially), a shallow notch preapically and ~ 3 small apical setulae (Fig. 3 c). Distiphallus with a ventral process linking basal and apical parts (with a thin posteromedial process, two broad posterolateral processes and a very long but thin anterior process (Fig. 3 c). Female. Unknown. Etymology. The specific name is derived from the Latin bicruris (bifurcated), and refers to the bifurcated posterior process on the S 5. Distribution. China (Xizang). Comments. Terrilimosina bicruris sp. nov. resembles T. parasmetanai Su in having a distiphallus with a long apical process, but differs in having S 5 with three densely setulose posterior processes and middle one bifurcated (Fig. 3 d), long fingerlike cercus, surstylus with a stout comb-like row of ventral bristles internally and postgonite with an inner posterior lobe (with a small process medially) (Fig. 3 a – c). Terrilimosina parasmetanai has a small densely setulose posteromedial process on S 5 (Fig. 25 d), short triangular cercus, a very small comb-like row of surstylar bristles ventrally and a shallowly bifurcated postgonite apex (Fig. 25 a – c).