Plagiozopelma trilobata, 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 : 24-25

Plagiozopelma trilobata sp. nov.

( Figs 8 , 17 )

Diagnosis. Antenna yellow, but scape brown; postpedicel triangular, 3.0 times longer than wide, blunt apically, cohering with basal segment of arista-like stylus. Legs mainly pale yellow except mid and hind coxae black. Cercus about 0.8 times as long as epandrium, furcated at base; dorsal arm linear, clothed with long, strong transparent bristles; ventral arm furcated at apical quarter ( Fig. 17 ).

Description. Male ( Fig. 8 ). Body length 4.8 mm, wing length 4.8 mm. Head metallic green. Hairs and bristles on head black except middle and lower postocular bristles including posteroventral hairs pale; frons with 1 curved, black anterior hair on posterolateral slope. Ocellar tubercle with 2 long strong oc and 2 short posterior hairs. Antenna yellow, but scape brown; pedicel with circlet of short, weak, black apical bristles; scape swollen and vaselike; postpedicel triangular, 3.0 times longer than wide, blunt apically, cohering with basal segment of arista-like stylus; arista-like stylus mainly black, basal segment somehow yellowish; basal segment 0.1 times as long as apical segment, arista-like stylus overall 1.25 times as long as length of head and thorax combined, apically with black oval flag. Proboscis yellow with yellow hairs; palpus dark yellow with pale hairs and 2 black apical bristles. Thorax brightly metallic green. Hairs and bristles on thorax black; 2 long posterior dc and 3 hairs anteriad; 3 paired acr, long and strong; pair of strong median sc, lateral pair absent. Legs mainly pale yellow except mid and hind coxae black, hind femur blackish apically, tarsi black from tip of tarsomere I onward. Hairs and bristles on legs black except on coxae pale to yellowish. All coxae with rows of long lateral hairs, fore coxa with 1 strong yellowish preapical ad, mid coxa with 1 preapical outer bristle at middle, hind coxa with 1 strong outer bristle at middle. Mid trochanter with 1 black outer bristle at middle. All femora with 2 rows of pale ventral hairs (1.5 times longer than width of fore femur). Fore tibia with 1 weak pd at basal 1/6. Mid tibia with 3 weak ad, 3 strong pd and 2 apical bristles. Hind tibia with 5 d and 1 apical bristle, all long, strong. Hind tarsomere I with 1 pd at extreme base. Relative length ratio of fore tibia and tarsomeres: 15.0: 10.0: 4.0: 3.5: 2.0: 1.0; 25.0: 15.0: 6.0: 4.0: 1.5: 1.0; 32.5: 12.5: 7.5: 5.0: 2.5: 1.5. Wing grayish brown, veins dark brown; vein M 1 elbowing at middle, crossvein dm-cu sinuated; CuAx ratio 2.5. Lower calypter pale with pale hairs. Halter light yellow. Abdomen metallic green. Hairs and bristles on abdomen black. Hypopygium ( Fig. 17 ). Epandrium longer than wide, epandrial lobe weak, thin, finger-like, with 2 long apical bristles. Surstylus about 0.3 times as long as epandrium, with weak apical branch dorsally and 7 short, weak apical bristles, apex broad, with 1 peg-like apical bristle at middle. Cercus about 0.8 times as long as epandrium, furcated at base; dorsal arm linear, clothed with long strong transparent bristles; ventral arm furcated at apical quarter, dorsal branch with 7 transparent dorsal bristles at apical ¼ to 1/8, 3 weak transparent preapical ventral bristles, ventral branch with 6 weak transparent bristles and 3 black normal bristles at apical 1/8. Hypandrium rather thick at apical third. Phallus thin, sharp at apex.

Female. Unknown.

Type material. HOLOTYPE , ♂ labelled: China. Tibet: Nyingchi, Medog [N29°22′ E95°26′], 827 m, 2017. VII.1, sweep nets, Qicheng Yang (CAU).

Distribution. China (Tibet).

Remarks. The holotype was collected in broad-leaf forest. The new species is similar to P. luchunanum Yang & Saigusa, 2001 from Yunnan ( China), but may be separated from the latter by the length of the postpedicel and the color of the fore tarsus. In the latter, the postpedicel is as long as wide, and the fore tarsus is yellow ( Yang & Saigusa 2001).

Etymology. The species is named after the cercus which bifurcates two times.

Figures

FIGURES 8–9. 8. Plagiozopelma trilobata sp. nov.; 9. Sciapus zewoiensus sp. nov. All males. Scale bar = 1.0 mm.

FIGURES 16–18. Male hypopygium, lateral view. 16. Plagiozopelma fornicata sp. nov.; 17. Plagiozopelma trilobata sp. nov.; 18. Sciapus zewoiensus sp. nov. Scale bar = 0.2 mm. Abbreviations: epn = epandrium, hyp = hypandrium, ph = phallus, sur = surstylus, lat = lateral lobe, cer = cercus.