Medetera shiae, Tang, Chufei, Wang, Ning & Yang, Ding, 2016

Tang, Chufei, Wang, Ning & Yang, Ding, 2016, New species of Medetera from Inner Mongolia, China (Diptera, Dolichopodidae, Medeterinae), ZooKeys 604, pp. 117-144 : 133-134

Taxon classification Animalia Diptera Dolichopodidae

Medetera shiae sp. n. Figs 7, 22-23, 36

Diagnosis.

Width of face about 1.5 times length of first flagellomere. First flagellomere rounded, nearly 0.8 times longer than wide. Four pairs of dc in same length, eight biseriate acr. M-Cu somewhat curved. CuAx ratio 0.61. Cercus strip-like, narrowed towards tip, base dilated, with one apically dilated blade-like apical bristle. Hypandrium thin, tilted back at tip. Phallus thin and sharp at tip, almost totally separate from hypandrium.

Description.

Male (Fig. 7). Body length 3.0 mm, wing length 2.5 mm. Head: vertex, frons and face dark metallic green with gray pollinosity; eyes separated, face nearly parallel, width of face about 1.5 times length of first flagellomere. Hairs and bristles on head black except postocular bristles and posteroventral hairs pale yellow. Antenna (Fig. 22) black; first flagellomere rounded, nearly 0.8 times longer than wide, shortly brown pubescent; arista apical, black, bare, with basal segment extremely short, less than 0.1 times length of apical segment. Proboscis extremely wide, black with pale white apical hairs; palpus black with pale white apical bristle.

Thorax metallic green with gray pollinosity. Hairs and bristles on thorax black. Four pairs of dc in same length, eight biseriate acr, two sa. Scutellum with two pairs of sc, median pair long strong. Legs all black, but brown to yellow at apical 1/3 of femora, dark yellow at tibiae except extreme base and tip, yellow at apical half of tarsomere 1. Hairs and bristles on legs mainly black, but pale yellow on tarsus. Fore coxa with four ventral bristles at apical half; mid and hind coxae each with one outer bristle at middle. Fore trochanter with two bristles at middle. Hind tibia with two short apical bristles. Relative length of tibiae and five tarsomeres of legs LI: 3.0: 1.3: 1.0: 0.6: 0.3: 0.3; LII: 4.5: 2.2: 1.3: 0.7: 0.5: 0.5; LIII:5.0: 1.2:2.1: 1.2: 0.5: 0.5. Wing nearly hyaline, tinged brown; veins brown, R4+5 and M1+2 convergent apically. M-Cu somewhat curved. CuAx ratio 0.61. Squama pale white with long pale white hairs. Halter pale yellow.

Abdomen dark metallic green with thin gray pollinosity. Hairs and bristles pale yellow. Male genitalia (Figs 23, 36) Mainly black except epandrial lobes, surstylus and cercus dark yellow, phallus black. Hairs and bristles yellow to pale white. Epandrium longer than wide; epandrial lobes forming one long digitation with two long and slender apical bristles. Ventral surstylus straight, round at apex, with row of six long apical bristles; dorsal surstylus wide and U-shaped apically, straight and thin, ventral lobe with one preapical long spine-like bristle, dorsal lobe with four short bristles. Cercus strip-like, three times longer than the widest point, narrowed towards tip, base dilated, ventral and dorsal margins each invaginated at basal 1/3 and dorsal 1/3, with long and dense marginal bristles at dorsal margin, with one apically dilated blade-like apical bristle. Hypandrium thin, tilted back at tip. Phallus thin and sharp at tip, almost entirely separate with hypandrium.

Female. Unknown.

Types.

Holotype male, CHINA, Inner Mongolia, Helan Mountain, fork of the main peak (N38°51'02.5", E105°49'09.4"), 2247 m, collected by sweeping nets in grass, 2014.VII.6, Li Shi (CAU). Paratypes: three males, same data as holotype (CAU).

Distribution.

Palaearctic: China (Inner Mongolia).

Remarks.

This new species is somewhat similar to Medetera paralamprostoma Negrobov, 1974 because they share the similarity in dc and the color of legs and the size, but can be distinguished from the latter by the bristles on legs, the CuAx ratio and the shape of hypandrium. In Medetera paralamprostoma , the CuAx ratio is 1.625, hind femur has one long ad at base and hind tibia has one long preapical pd. The hypandrium is thin and wedge-like ( Negrobov and Stackelberg 1974: 327).

Etymology.

The species is named after the collector Li Shi.