Medetera shuimogouensis, 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 : 134-136

Taxon classification Animalia Diptera Dolichopodidae

Medetera shuimogouensis sp. n. Figs 8, 24-25, 37

Diagnosis.

Width of face approximately twice length of first flagellomere. Four pairs of dc (anterior one short, posterior three strong), four biseriate acr. CuAx ratio 0.8. Phallus thin with big and round apex. Ventral surstylus long, wide, slightly narrowed towards tip, with three short apical bristles; dorsal surstylus thin, narrowed towards tip, wide and rounded apically, with three short apical bristles. Cercus nearly oval, 1.8 times longer than wide, without specialized bristles, covered with thin bristles (marginal bristles distributed averagely).

Description.

Male (Fig. 8). Body length 2.4-2.5 mm, wing length 3.5 mm. Head: vertex, frons and face metallic green with gray pollinosity; eyes separated, face nearly parallel, width of face about twice length of first flagellomere. Hairs and bristles on head black except postocular bristles black and posteroventral pale yellow. Antenna (Fig. 24) all black; first flagellomere 0.8 times longer than wide; arista apical, thinly black pubescent, nearly bare, with basal segment extremely short, less than 0.1 times length of apical segment. Proboscis dark brown with radius dark brown strips, and with short pale apical hairs; palpus black with one strong black apical bristles.

Thorax metallic green with gray pollinosity. Hairs and bristles on thorax dark yellow. Four pairs of dc (anterior one short, posterior three strong), four regular biseriate acr at anterior portion, two sa, pp with two yellow bristles not in equal length. Scutellum with two pairs of sc (median pair long strong). Legs black except tips of femora yellow. Hairs and bristles on legs mainly pale. Fore coxa with two rows of four paired ad-pd at apical 1/2; mid coxa with two outer bristles at middles; hind coxa with one outer bristle at middle. Mid trochanter with three short bristles apically. Hind femur with two rows of four short paired ad-pd at basal 1/3. Fore tibia with three short ventral apical bristles. Mid tibia with one brown ad at basal 2/5, one pd at basal 1/10 and two short ventral apical bristles; hind tibia without distinct bristles. Relative length of tibia and five tarsomeres of legs LI: 5.0: 1.0: 1.5: 1.0: 0.7: 0.5; LII: 6.5: 3.0: 2.0: 1.6: 0.6: 0.7; LIII: 7.5: 1.5: 4.0: 1.6: 0.8: 0.7. Wing nearly hyaline, tinged brown; veins brown, R4+5 and M1+2 convergent apically. CuAx ratio 0.8. Squama pale white with pale white hairs. Halter pale yellow.

Abdomen metallic green with thin gray pollinosity. Hairs and bristles pale yellow. Male genitalia (Figs 25, 37): Mainly black except epandrial lobes, surstylus and cercus dark yellow, phallus dark brown. Hairs and bristles yellow to pale white. Epandrium longer than wide; epandrial lobes forming one digitation with two slender apical bristles. Ventral surstylus long, wide, slightly narrowed towards tip, with three short apical bristles; dorsal surstylus thin, narrowed towards tip, wide and rounded apically, with three short apical bristles. Cercus nearly oval, 1.8 times longer than wide, without specialized bristles, covered with thin bristles (marginal bristles distributed averagely). Hypandrium narrowed towards tip, blunt apically, thin and simple in lateral view. Phallus thin with big and round apex.

Female. Unknown.

Types.

Holotype male, CHINA, Inner Mongolia, Helan Mountain, Shuimogou (N38°96'42.40", E105°85'82.60 '’), 1270 m, collected by sweeping nets in grass, 2010.VIII.6, Yan Li (CAU). Paratypes: two males, same data as holotype (CAU).

Distribution.

Palaearctic: China (Inner Mongolia).

Remarks.

This new species is unique for the cercus as it has no obvious bristle. The other parts of the species are somewhat like Medetera feminina Negrobov, 1967 as they have similar dc and the bristles on pp, the halter and the color and the bristles of/on legs, but can be distinguished from the latter by the shape of phallus, in Medetera feminina , the phallus is curved like the beak of an eagle apically. ( Negrobov and Stackelberg 1972: 299, figs 527-529, 535).

Etymology.

The species is named for the type locality, Shuimogou.