Oedalea wenliangi, Zeng & Lin & Yang, 2022

Zeng, Wei, Lin, Chen & Yang, Ding, 2022, Four new species of Oedalea (Diptera, Empidoidea, Hybotidae, Oedaleinae) from China with a key to south eastern Asian species, Zootaxa 5141 (6), pp. 553-567 : 557-560

4. Oedalea wenliangi sp. nov.

( Figs 8–14 )

Diagnosis. Antenna very long, 1.7 times longer than head height, dark brown except scape blackish. Hairs on mesonotum somewhat dense, acr separated distinctly from dc before suture; bristles brownish yellow, 1 very long prsc. Pterostigma short and wide, nearly rectangular, straight at outer margin. Halter brown. Left surstylus distinctly widened apically.

Description. Male. Body length 3.9–4.0 mm, wing length 3.9 mm. Head ( Fig. 9 ) 0.6 mm, black with gray pollinosity. Eyes brownish black, contiguous on frons; clypeus shiny black. Hairs and bristles on head black, lower occiput with partly brownish yellow hairs. Ocellar tubercle distinct with 2 oc and 2 posterior hairs; upper occiput with 5–6 slightly long postocular bristles slightly curved forward and inward. Antenna very long, 1.7 times longer than head height, dark brown except scape blackish; pedicel with circlet of black apical bristles; first flagellomere greatly elongated, 9.2 times longer than wide, with short dark brown pubescence; stylus dark brown, thin spine-like, 7/10 as long as basal width of first flagellomere. Proboscis 0.8 times as long as head height, dark brownish yellow with blackish hairs; palpus entirely brown with blackish hairs.

Thorax subshiny black with thin gray pollinosity. Hairs on thorax rather short, dark yellow; bristles brownish yellow; hairs on mesonotum somewhat dense; ppn absent; acr and dc multiseriate, acr narrowly separated from dc before suture; 2 npl (anterior one short, posterior one long), 1 psa, 1 very long prsc dc; 3 pairs of sc. Legs dark yellow, except hind tibia dark brown with pale base and tarsi from apex of tarsomere 1 dark brown onward. Fore tibia slightly thickened, hind tibia slightly curved. Hairs and bristles on legs dark brown; coxae with mostly dark yellow and partly brown hairs and bristles. Fore femur slightly thickened, 1.2 times as wide as mid femur; hind femur distinctly thickened, 2.8 times as wide as mid femur, with about four rows of black ventral spine-like bristles apically (outer av and pv rather long). Wing ( Fig. 10 ) nearly hyaline, weakly brownish above discal cell and M 1; dark brown pterostigma short and wide, suboval with nearly straight outer margin; veins dark brown, R 2+3 distinctly curved beneath pterostigma, M 2 complete. Squama dark yellow with dark yellow hairs. Halter with brown knob and yellow stem.

Abdomen nearly straight or apically weakly curved downward, somewhat shiny blackish with gray pollinosity. Hypopygium narrower than pregenital segments. Hairs and bristles on abdomen dark yellow, except those on apex dark brown.

Terminalia ( Figs 11–14 ): Left and right cerci digitiform, apically slightly narrowed. Basal bridge of epandrium somewhat wide; left and right epandrial lamellae thick and not narrowed apically (dorsal view). Right epandrial lamella trapezoidal (lateral view); right surstylus about 2.0 times longer than wide, apically indistinctly curved ventrally. Left epandrial lamella long trapezoidal (lateral view); left surstylus somewhat trapezoidal, apically distinctly expanded, with weakly concave apical margin (lateral view). Hypandrium very long and narrowed, apical hook short, strongly curved.

Female. Unknown.

Type material. HOLOTYPE ♂, Yunnan, Tengchong, Zizhi [25°1′14″N, 98°29′27″E, 3544 m], 2012.V.7, Wenliang Li ( CAU) . PARATYPE: 1 ♂, same data as holotype ( CAU) .

Distribution. China (Yunnan).

Remarks. The new species is similar to O. vietnamensis , but may be separated from the latter by pedicel and first flagellomere paler than scape (pedicel paler than first flagellomere and scape O. vietnamensis ); pterostigma slightly short, suboval; left surstylus distinctly widened apically.

Etymology. The specific name refers to collector, Wenliang Li.

Figures

FIGURES 8–10. Oedalea wenliangi sp. nov. (male). 8. Adult habitus, lateral view; 9. Head, lateral view; 10. Wing.

FIGURES 11–14. Oedalea wenliangi sp. nov. (male). 11. Genitalia, dorsal view; 12. Left epandrial lamella, lateral view; 13. Right epandrial lamella, lateral view; 14. Hypandrium and phallus, ventral view. Abbreviations: see Material and methods.