Amblypsilopus medogensis, Tang & Zhu & Yang, 2019

Tang, Chufei, Zhu, Yajun & Yang, Ding, 2019, Sciapodinae from the Himalayan region with description of nine new species from Tibet (Diptera: Dolichopodidae), Zootaxa 4577 (1), pp. 1-28 : 13-14

Amblypsilopus medogensis sp. nov.

( Figs 5 , 14 )

Diagnosis. Coxae black; basal third of fore femur, basal half of mid and hind femora black dorsally. CuAx ratio 1.7. Halter dark brown. Dorsal surstylus finger-like, slightly narrowed at apical third; ventral surstylus slightly raised ventrally at middle, with 7 long, strong apical bristles. Cercus digitiform, nearly 3/5 as long as epandrium, blunt at apex, clothed with long, strong transparent bristles.

Description. Male ( Fig. 5 ). Body length 3.9 mm, wing length 3.4 mm. Head metallic green with pale grey pollinosity. Hairs and bristles on head black except middle and lower postocular bristles including posteroventral hairs pale; frons with 1 long strong vt. Ocellar tubercle with 2 long strong oc and 2 posterior hairs. Antenna dark brown; postpedicel subtriangular, blunt at tip, 0.8 times as wide as long; pedicel rounded with circlet of apical bristles; arista-like stylus dorsal, black, nearly bare, as long as head, basal segment less than 0.1 times as long as apical segment. Proboscis yellow with pale hairs; palpus brown with black apical bristles. Thorax metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 5 dc, of which posterior 2 very strong; 3 biseriate long, strong bristle-like acr; 2 sc, lateral pair short, median pair half as long as scutum. Legs mainly yellow, but coxae black, basal third of fore femur, basal half of mid and hind femora black dorsally, fore tarsus black, mid and hind tarsi black from apex of tarsomere I onward. Hairs and bristles on legs mainly black except bristles on coxae pale, ventral hairs and bristles on femora pale. Fore coxa with rows of hairs and 2 strong dorsal bristles apically as long as 2/3 of fore coxa, mid coxa with rows of hairs dorsally and 4 curved dorsal bristles at apical third, as long as coxa; hind coxa with 1 outer bristle at middle. Fore femur with row of 11 long, thin ventral bristles and 1 weak, black preapical av; mid femur with row of 12 long thin ventral bristles and 1 weak black preapical av; hind femur with row of 8 long thin ventral bristles at basal half. Tibiae without distinct bristles. Relative length ratio of tibiae and tarsomeres: LI 16.0: 13.0: 4.0: 3.0: 2.0: 1.0; LII 14.0: 16.0: 5.0: 4.0: 2.0: 1.0; LIII 28.5: 16.5: 5.0: 3.5: 2.5: 1.0. Wing hyaline, veins dark brown. Crossvein dm-cu straight, CuAx ratio 1.7. Lower calypter black with fan of long black hairs. Halter dark brown. Abdomen curved downward, pale metallic green with thin pale gray pollinosity. Hairs and bristles on abdomen black. Hypopygium ( Fig. 14 ): Epandrium longer than wide in lateral view; epandrial lobe small, lobate, transparent, with 3 apical bristles. Surstylus dark brown, divided: dorsal surstylus finger-like, slightly narrow at apical third, with 3 short strong apical bristles, 1 short dorsal bristle at apical 1/5, 1 long strong dorsal bristle at apical quarter; ventral surstylus slightly raised ventrally at middle, with 7 long strong apical bristles. Cercus dark brown, digitiform, nearly 3/5 as long as epandrium, blunt at apex, clothed with long, strong transparent bristles and short black exterior hairs. Hypandrium simple, yellowish, hook-like apically; phallus strong, dark brown, level apically.

Female. Unknown.

Type material. HOLOTYPE , ♂ labelled: China. Tibet: Nyingchi, Medog, Beibeng [N29°24′10″ E95°17′57″], 939 m, 2017. V.14, sweep nets, Qicheng Yang (CAU).

Distribution. China (Tibet).

Remarks. The type specimen was collected in bush. The new species is somewhat similar to A. pusillus (Macquart) distributed in Pakistan, India and Nepal, but may be separated from the latter by the size of the cercus and shape of the surstylus. In A. pusillus , the cercus is distinctly longer than the epandrium, and the surstylus is not bifurcated ( Yang et al. 2011, fig. 66).

Etymology. The species is named after the type locality.

Figures

FIGURES 5–7. 5. Amblypsilopus medogensis sp. nov.; 6. Amblypsilopus quinquepetalus sp. nov.; 7. Plagiozopelma fornicata sp. nov. All males. Scale bar = 1.0 mm.

FIGURES 13–15. Male hypopygium, lateral view. 13. Amblypsilopus marginatus sp. nov.; 14. Amblypsilopus medogensis sp. nov.; 15. Amblypsilopus quinquepetalus sp. nov. Scale bar = 0.2 mm. Abbreviations: epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, lat = lateral lobe, cer = cercus.