Amblypsilopus acuminatus, 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 : 4-5

Amblypsilopus acuminatus sp. nov.

( Figs 1 , 10 )

Diagnosis. All coxae yellow except base of fore coxa black. Epandrial lobe finger-like, with short apical hairs and 2 dorsal bristles. Surstylus large, square, with row of 7 long, strong dorsal bristles. Cercus dark yellow, long digitiform, tapered towards tip, with marginal bristles on dorsal and ventral margins ( Fig. 10 ).

Description. Male ( Fig. 1 ). Body length 4.2 mm, wing length 4.0 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, postocular bristles long, about 0.7 times as long as width of head; 1 long strong vt. Ocellar tubercle with 2 long strong oc and 2 posterior hairs. Antenna dark brown; postpedicel subtriangular, blunt at tip, nearly as long as wide; pedicel rounded with circlet of short weak, blackish apical bristles except 3 spinous ventral bristles relatively long and strong, of which one bristle about 2.0 times longer than other two; 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 pale 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 bristlelike acr; 2 sc, lateral pair short, median pair half as long as scutum. Legs mainly yellow except fore coxa black at base, 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 and mid coxae each with 6 long dorsal hairs at apical third; hind coxa with 1 outer bristle at middle. Fore femur with row of 8 ventral hairs; hind femur with 5 short ventral hairs on apical 1/8. Tibiae without distinct bristles except fore tibia with 1 short strong apical bristle. Relative length ratio of tibiae and tarsomeres: LI 16.0: 15.0: 5.0: 3.5: 2.5: 1.5; LII 18.5: 12.5: 5.0: 4.0: 2.5: 1.5; LIII 30.0: 12.5: 6.0: 3.5: 2.5: 1.0. Wing hyaline, veins dark brown. Crossvein m-cu straight, CuAx ratio 2.0. Lower calypter pale black with short black hairs. Halter pale. Abdomen curved downward, pale metallic green with thin pale gray pollinosity. Hairs and bristles on abdomen black. Hypopygium ( Fig. 10 ): Epandrium longer than wide in lateral view; epandrial lobe nearly invisible. Surstylus large, square, with row of 7 strong dorsal bristles. Cercus dark yellow, filiform, tapered towards tip, nearly as long as epandrium, blunt apically, with long blackish marginal bristles on ventral margin except 2 bristles near tip pale, with thin pale bristles on dorsal margin, with some short weak external bristles. Hypandrium simple; phallus almost hidden in hypandrium, simple.

Female. Unknown.

Type material. HOLOTYPE ♂, labelled: China. Tibet: Nyingchi, Medog , 108k, N29°48′ 99.99″ E95°44′56.48″, 870 m, 2014. VII.31, sweep nets; Yan Li (CAU). PARATYPE: 1 ♂, same data as holotype.

Distribution. China (Tibet).

Remarks. The new species is similar to A. ampliatus Yang from Tibet ( China), but may be separated from the latter by the size of cercus and the shape of the surstylus. In A. ampliatus , the cercus is small, less than half as long as the epandrium; the surstylus has an independent sclerite basally ( Yang 1995; Yang et al. 2011, fig. 50). The type specimens were collected in bushes alongside open water.

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

Figures

FIGURES 1–4. 1. Amblypsilopus acuminatus sp. nov.; 2. Amblypsilopus liangi sp. nov.; 3. Amblypsilopus liratus sp. nov.; 4. Amblypsilopus marginatus sp. nov. All males. Scale bar = 1.0 mm.

FIGURES 10–12. Male hypopygium, lateral view. 10. Amblypsilopus acuminatus sp. nov.; 11. Amblypsilopus liangi sp. nov.; 12. Amblypsilopus liratus sp. nov. Scale bar = 0.2 mm. Abbreviations: epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, lat = lateral lobe, cer = cercus.