Medetera sinuosa, Tang, Chufei, Wang, Baohai & Yang, Ding, 2015

Tang, Chufei, Wang, Baohai & Yang, Ding, 2015, New species of Medetera (Diptera: Dolichopodidae, Medeterinae) from Tibet, Zootaxa 3946 (3), pp. 427-435 : 433

Medetera sinuosa sp. nov.

( Figs 3–4, 11–13 )

Diagnosis. Antennal first flagellomere long pale pubescent ( Fig. 11 ). Fore femur bent basally ( Fig. 3). Cercus curved, with 1 claw-like bristle and 1 small projection apically; hypandrium globose basally in ventral view. ( Figs 12–13 ).

Description. Male ( Fig. 3). Body length 2.5 mm, wing length 2.5 mm. Head: vertex, frons and face dark metallic green, nearly black, with gray pollinosity; eyes separated, face nearly parallel, about 1.5 times wider than first flagellomere. Hairs and bristles on head black, postocular bristles black and posteroventral hairs dark brown. Antenna black, first flagellomere nearly semicircular, long pale pubescent; arista subapical, black, basal segment less than 0.1 times as long as apical segment ( Fig. 11 ). Proboscis short, nearly black, with pale hairs around outer margin; palpus black, with 1 short black bristle and some short brown hairs at tip. Thorax dark metallic green, nearly black, with grey pollinosity. Hairs and bristles on thorax black. Six pairs of dc, of which hind 4 strong, decreasing in size anteriorly, 10 pairs of regular acr. Scutellum with 2 pairs of long strong sc. Legs mainly black, but fore and mid femora yellow at apical 1/6, hind femur yellow at apical 1/5; tibiae yellow at apical 1/10. Fore femur thin, bent basally. Hairs and bristles mainly black, but apical bristles of fore coxa yellow, ventral bristles on fore tibia and fore tarsomere 1 pale, pv on hind femur pale. Fore coxa with 8 pd (2 preapical), 8 ad and 1 long apical bristle, mid coxa with 6 ad (basal 4 short weak, apical 1 strong), 3 pd (mid 1 very strong), 2 weak apical bristles; hind coxa with 1 outer bristle at middle. Mid trochanter with 3 strong apical bristles. Fore femur with 8 weak ad on basal half, 4 av on apical half, mid femur with 8 short ad on apical 2/3; hind femur with 3 short ad on basal 1/3 and 6 pv on basal half, 2 strong av on apical 1/3. Fore and hind tibiae with row of short spinous ventral bristles. Hind tarsomere 1 with obvious dentate av. Relative length of tibia and 5 tarsomeres of legs LI: 4.0: 2.0: 1.0: 0.8: 0.5: 0.6; LII: 4.5: 2.5: 1.3: 0.9: 0.5: 0.5; LIII: 5.5: 1.3: 2.1: 1.0: 0.5: 0.5. Wing nearly hyaline, tinged brown; veins brown, R4+5 and M1+2 convergent apically. CuAx ratio 0.6. Squama pale with 8 short pale hairs. Halter pale. Abdomen short, dark metallic green with thin grey pollinosity. Hairs pale; bristles black. Hypopygium ( Figs 12–13 ): Mainly black, but hypandrium dark yellow, phallus, cercus and surstylus brownish. Epandrium longer than wide; epandrial lobes fused into 1 digitiform process with 2 strong apical bristles. Ventral surstylus long, thin, almost straight, with large, simple and rounded apex, with 3 short weak apical bristles; dorsal surstylus slightly narrower towards tip, wide and U–shaped apically, dorsal lobe and ventral lobe each with short weak bristles, straight towards tip, sharp apically. Cercus curved, narrower towards tip, dorsally depressed heavily at middle, ventrally depressed slightly at apical 1/3, with 1 claw-like bristle and 1 small projection apically; thickly covered with thin bristles, with thick and thin marginal bristles and some long strong bristles distributed averagely. Hypandrium globose basally in ventral view, narrower towards tip, sharp apically, tip tilted, tilted portion somewhat crimped, long, thin and simple in lateral view. Female ( Fig. 4). Body length 2.5 mm, wing length 2.6 mm. Similar to male.

Type material. HOLOTYPE, ♂ labeled: China: Tibet, Nyingchi, Sejila mountain pass West (N29°57'09.33", E94°48'74.69"), 3573 m, collected by Malaise trap in grass, 2012. VIII.18–25, Baohai Wang and Zhaohui Pan ( CAU). PARATYPES: 1 ♂ 3 ♀, same data as holotype ( CAU).

Distribution. Oriental: China (Tibet).

Remarks. The new species is very similar to M. opaca De Meijere from Hong Kong, Vietnam and Indonesia, but may be separated from the latter by the appearance of the surstylus and cercus; in M. opaca , ventral and dorsal surstyli coalesced basally, cercus with dorsoapical blade-like bristles on stout base, and subtended by ventral lobate projection bearing two bristles ( Bickel 1987, fig. 18a).

Etymology. The specific name refers to the shape of the cercus.

Figures

FIGURES 11 – 13. Medetera sinuosa sp. nov., male. 11. Antenna; 12. genitalia, lateral view; 13. genitalia, ventral view. Abbreviations: epl = epandrial lobe, epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, cer = cercus. Scale bar = 0.2 mm.