Amblypsilopus quinquepetalus, 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 : 14

Amblypsilopus quinquepetalus sp. nov.

( Figs 6 , 15 )

Diagnosis. Legs mainly yellow but fore coxa black basally, mid and hind coxae black; hind femur black apically. Surstylus with 5 digitiform apical protuberances, with 2 blade-like pale apical bristles. Cercus yellow, simple, thin and digitiform, with 3 spinous pale apical bristles and 4 thin spinous dorsal bristles.

Description. Male ( Fig. 6 ). Body length 3.3 mm, wing length 3.4 mm. Head brightly metallic green with pale grey pollinosity. Hairs and bristles on head black except middle and lower postocular bristles including posteroventral hairs pale, 1 long strong vt. Ocellar tubercle with 2 long strong oc and 2 posterior hairs. Antenna dark brown; postpedicel triangular, blunt at tip, as long as wide; pedicel rounded with circlet of short weak blackish apical bristles; arista-like stylus lost. Proboscis yellow with black hairs; palpus pale with black apical bristles. Thorax brightly metallic green with pale grey pollinosity. Hairs and bristles on thorax black; 5 dc, of which only posterior 2 strong; 3 biseriate long bristle-like acr; 2 sc, lateral pair short, median pair half as long as scutum. Legs mainly yellow except fore coxa black basally, mid and hind coxae black; hind femur black apically, hind tarsomeres II–V black. Hairs and bristles on legs black. Fore coxa with 2 spinous dorsal bristles at apical half, half as long as fore femur; mid coxa with 1 thin outer bristle at middle as long as middle coxa; hind coxa with 1 outer bristle at middle. Fore femur with 4 spinous ventral bristles at apical half, all nearly twice as long as width of fore femur, of which second basal bristle relatively strong, with 1 preapical av; mid and hind femora without distinct bristles except 1 pale spinous apical bristle at mid femur. Fore tibia with 1 ad at middle, 3 av at middle, apical quarter and preapical point, respectively. Mid tibia with 1 weak av at basal third. Hind tibia with row of 2 paired pd and pv. Relative length ratio of tibiae and tarsomeres: LI 9.9: 6.6: 3.3: 2.3: 1.6: 1.0; LII 23.1: 9.9:?:?:?:?; LIII 26.4: 11.5: 6.6: 3.3: 1.6: 1.0. Wing hyaline, veins dark brown. Crossvein dm-cu slightly sinuated CuAx ratio 1.8. Lower calypter pale with long pale hairs. Halter pale. Abdomen curved downward, pale metallic green with thin pale gray pollinosity. Hairs and bristles on abdomen black. Hypopygium ( Fig. 15 ): Epandrium longer than wide in lateral view; epandrial lobe small and thin, digitiform, with 2 long, pale apical bristles. Surstylus large, square, with 5 digitiform apical protuberances, all with apical bristles, with 2 blade-like pale apical bristles at middle and second digit dorsum to venter, respectively. Cercus yellow, simple, thin and digitiform, with 3 spinous pale apical bristles and 4 thin spinous dorsal bristles. Hypandrium simple; phallus almost hidden in hypandrium, simple, truncate apically.

Female. Unknown.

Type material. HOLOTYPE ♂, labelled: China. Tibet: Nyingchi, Medog, Dexing , Badeng [N29°32′28″ E95°30′56″], 811 m, 2013. VII.12, sweep nets in broad-leaf forest, Xiaoyan Liu (CAU).

Distribution. China (Tibet).

Remarks. The holotype specimen was collected in a broad-leaf forest. The new species is unique in its surstylar shape, characterized by its 5 digitiform apical protuberances ( Fig. 15 ).

Etymology. The species is named for the shape of the surstylus.

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.