Homoneura (Homoneura) longiacutata, Gao & Shi, 2019

Gao, Xuefeng & Shi, Li, 2019, Nine new species of genus Homoneura from Qinling mountains in China (Diptera: Lauxaniidae), Zootaxa 4608 (3), pp. 401-432 : 411

Homoneura (Homoneura) longiacutata sp. nov.

( Figs 35−40 , 41−45 )

Description. MALE. Body length 5.7–5.9 mm, wing length 5.3–5.6 mm.

Head ( Figs 36−37 ) yellow. Frons with a pair of brown stripes extending to ocellar triangle; ocellar setae about 1.2 times as long as anterior fronto-orbital setae, and posterior fronto-orbital setae about 1.3 times as long as anterior fronto-orbital setae. Parafacial yellow and black inner margin, a row of black short setulae on apical half of inner margin. Gena about 1/7 height of eye. Antenna yellow, 1st flagellomere about 1.9 times longer than high; arista dark brown, with longest ray as long as 1/2 height of 1st flagellomere. Proboscis and palpus yellow.

Thorax ( Fig. 38 ) yellow. Mesonotum with 0+3 dorsocentral setae (1st post–sutural dorsocentral setae behind the transversal suture), acrostichal setulae in 6 rows. Legs mostly yellow, all femora pale brown to dark brown and all tarsomeres 3–5 brown. Fore femur with 5 posterodorsall setae, 3 posteroventral setae and ctenidium with 13 short setae; fore tibia with 1 long preapical anterodorsal seta and 1 short apicoventral seta. Mid femur with 3 anterior setae and 1 short apicoposterior seta; mid tibia with 1 strong preapical anterodorsal seta and 2 strong apicoventral setae. Hind femur with 1 preapical anterodorsal seta; hind tibia with 1 long preapical anterodorsal seta and 1 short apicoventral seta. Wing ( Fig. 40 ) pale yellow, brown apical spot on R 2+3 separated from that on R 4+5, brown apical spot on R 4+5 and M 1 slightly fused, and upper margin of brown cloud on crossvein dm-cu fused with a brown rectangular median spot on R 4+5; subcostal cell pale brown at apex; 2nd (between R 1 and R 2+3), 3rd (between R 2+3 and R 4+5) and 4th (between R 4+5 and M 1) sections in proportion of 4.7:1.3:1; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1:1.4; ultimate sections of CuA 1 about 1/9. Halter pale yellow.

Abdomen ( Fig. 39 ) yellow, tergites 2–4 each with brown posterior margin while tergite 5 with pale brown posterior margin. Male genitalia ( Figs 41−45 ): syntergosternite 7+8 circular with ventral bridge; epandrium broad with three pairs of dorsal setae; surstylus long subuliform in posterior view; hypandrium reverse U-shaped; pregonite broad triangular in ventral view while postgonite shorter than pregonite, with two teeth-like processes in lateral view; phallus with two pairs of sharp processes on apical half in ventral view while curved backward apically and sharp at apex in lateral view; phallapodeme shorter than phallus in lateral view.

FEMALE. Body length 5.6–5.9 mm, wing length 5.2–5.6 mm.

Type material. CHINA, Shaanxi Province: Holotype ♂ ( IMAU), Foping County, Daguping, 1329.2 m, 24. VIII. 2014, Xiumei Lu . Paratypes ( IMAU): 1♂, Foping County, Daguping, 1366.2 m, 22. VIII. 2014, Xiumei Lu ; 1♂, Ningshan County, Xunyangba Town, Malaise trap, 1365 m, 13. VIII. 2013, Yuqiang Xi ; 2♀♀, Foping County, Daguping, 1366.2 m, 22. VIII. 2014, Xiumei Lu .

Distribution. China (Shaanxi).

Remarks. The new species is similar to Homoneura (Homoneura) serrata Gao & Yang, 2002 from China. But the latter has three diagnoses: the longest ray of the arista is as long as height of 1st flagellomere and the abdomen is pale brown, and the surstylus is straight claviform in lateral view. It is also similar to Homoneura (Homoneura) longicurva sp. nov., but the latter’s surstylus is curved at apex.

Etymology. Latin, longi -, meaning long + acutata , meaning sharp, referring to the surstylus being long and sharp at apex; a feminine adjective.

Figures

FIGURES 35–40. Homoneura (Homoneura) longiacutata sp. nov. Paratype male. 35. habitus, lateral view; 36–37. head, anterior and lateral view; 38. thorax, dorsal view; 39. abdomen, lateral view; 40. wing.

FIGURES 41–45. Homoneura (Homoneura) longiacutata sp. nov. Paratype male genitalia. 41. syntergosternite and epandrial complex, lateral view; 42. epandrial complex, posterior view; 43. syntergosternite, anterior view; 44. phallus complex, ventral view; 45. phallus complex, lateral view. Scale bar=0.1 mm.