Homoneura (Neohomoneura) tricuspidata, Shi, Li & Yang, Ding, 2008

Shi, Li & Yang, Ding, 2008, Species of the subgenus Neohomoneura van der Wulp from Hainan in China (Diptera, Lauxaniidae), Zootaxa 1793, pp. 28-46 : 38-39

Homoneura (Neohomoneura) tricuspidata sp. nov.

( Figs. 8 , 31–35 )

Diagnosis. Wing yellow, apical spot on R4+5 confluent with that on R2+3 and M1+2; spots on R4+5 and M1+2 not extending to vein tip, a stripe-like spot on dm-cu. Male tergites 2–6 (female 2–7) each with dark posterior margin and male tergites 4–6 (female 4–7) each with a dark triangular median spot connected with dark posterior margin. Aedeagus with 2 small tiny spines basally and 2 furcated lateral processes subapically.

Description. MALE. Body length 6.6–7.0 mm, wing length 6.1–6.6 mm. FEMALE. Body length 6.0– 6.4 mm, wing length 5.4–6.0 mm.

Head yellow to brownish yellow. Frons about as long as wide and parallel–sided, with 2 brown stripes extending to ocellar triangle; ocellar triangle brownish; oc developed, about longer than anteriormost or; gena about 1/4 height of eye. Antenna yellow, 1st flagellomere 2.0 times as long as wide; arista dark except brownish base, with longest hairs longer than width of 1st flagellomere. Proboscis yellow, with yellowish hairs and dark hairs; palpus yellow, with dark hairs.

Thorax yellow to brownish yellow. Mesoscutum with 0+3 dc (anteriormost dc clearly behind transverse scutal suture), acr in 10 somewhat irregular rows, uniformly short hair–like; prsc longer than 1st post–sutural dc. Legs yellow, tarsomeres 3–5 brownish yellow. Fore femur with 5 strong pv, 8 pd, and ctenidium with 11 short bristles; fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 5 a and 1 app, mid tibia with 1 strong preapical ad, 6 short pd and 3 strong apv. Hind femur with a row of weak av (only 3 apical bristles distinct) and 1 preapical ad; hind tibia with 1 weak preapical ad and 1 short av; 1st tarsomere with rows of short and dense v. Wing ( Fig. 8 ) yellow, apical spot on R4+5 confluent with that on R2+3 and M1+2, spots on R4+5 and M1+2 not extending to vein tip; apical spot on R4+5 with basal extremity at same vertical level or before that on R2+3, apical spot on R2+3 with basal extremity beyond dm-cu; a stripe–like spot on dm-cu, subcostal cell hyaline; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1+2) sections in proportion of 3.0: 0.75: 0.54; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.73: 2.71; ultimate section of CuA1 about 1/12 of penultimate. Halter yellow.

Abdomen yellow to brownish yellow. Male tergites 2–6 (female 2–7) each with dark posterior margin and male tergites 4–6 (female 4–7) each with a dark triangular median spot connected with dark posterior margin. Male genitalia ( Figs. 31–35 ): protandrium with a ventral bridge and two hairs around spiracle; surstylus moderately long, narrowed, strongly curved backward with a short acute tip; hypandrium Y–shaped, gonopod long and cylindrical; aedeagal apodeme longer than aedeagus; aedeagus broadened, with a deep apical incision, with 2 small tiny spines basally and 2 furcated lateral processes subapically.

Type material. Holotype male, Yinggeling National Nature Reserve, Hongmao village (430 m), 19. X. 2007, Xingyue Liu. Paratypes: 1 female, Hainan: data same as holotype; 2 males, 1 female, Hainan: Bawangling National Nature Reserve, Donger station (1000 m), 22. X. 2007, Xingyue Liu; 1male, Hainan: Bawangling National Nature Reserve, Donger station (1000 m), 22. V. 2007, Junhua Zhang; 1 male, 1 female, Hainan: Wuzhishan National Nature Reserve, Dengshandao (1000 m), 17. V. 2007, Kuiyan Zhang; 4 males, 2 females, Bawangling National Nature Reserve, Donger station (1000 m), 21-22. X. 2007, Ding Yang.

Distribution. China (Hainan).

Remarks. The new species is very similar to Homoneura (Neohomoneura) guangxiensis Gao & Yang from China (Guangxi) in all apical spots confluent and the aedeagus with 2 lateral processes, but it can be separated from the latter by the surstylus strongly curved backward with a short acute tip, the aedeagus long and broad with a pair of large subapical lateral processes furcated apically. In guangxiensis , the surstylus is weakly curved backward without the acute tip; the aedeagus is very short and V–shaped, apically with a pair of small lateral hamuli not furcated ( Gao & Yang, 2004).

Etymology. Latin, feminine, ‘ tricuspidata ’ = tricuspidal, referring to the aedeagus with the tricuspidal processes.

Figures

FIGURES 1 – 10. Wings. 1. Homoneura (Neohomoneura) digitata sp. nov.; 2. H. (N.) incompleta Malloch, 1927; 3. H. (N.) jianfengensis Yang, Hu & Zhu, 2002; 4 – 5. H. (N.) nadaensis Yang, Hu & Zhu, 2002; 6. H. (N.) pollex Sasakawa, 2001; 7. H. (N.) tortilis sp. nov.; 8. H. (N.) tricuspidata sp. nov.; 9. H. (N.) tripetata sp. nov.; 10. H. (N.) zengae sp. nov.

FIGURES 31 – 35. Homoneura (Neohomoneura) tricuspidata sp. nov. Male. 31. protandrium and epandrium, lateral view; 32. protandrium, anterior view; 33. epandrium, posterior view; 34. aedeagal complex, ventral view; 35. aedeagal complex, lateral view.