Homoneura (Neohomoneura) tortilis, 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 : 35-38

Homoneura (Neohomoneura) tortilis sp. nov.

( Figs. 7 , 26–30 )

Diagnosis. Spots on R2+3, R4+5 and M1+2 confluent and forming a wide transverse band, extending to extreme vein tip; spot on dm-cu indistinctly confluent with basal extremity of apical spot on R4+5, M1+2 with a small hyaline area beyond dm-cu. Male abdominal tergites 2–6 each with dark posterior margin. Surstylus basally with a small acute process, apically strongly tortile with an acute tip; hypandrium very short and nearly H– shaped.

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

Head 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 as long as anteriormost or; gena about 1/5 height of eye. Antenna brownish yellow; 1st flagellomere 2.0 times as long as wide; arista dark except brownish base, with longest hairs as long as width of 1st flagellomere. Proboscis yellow, with dark hairs; palpus yellow, with dark hairs.

Thorax brownish yellow. Mesoscutum with 0+3 dc (anteriormost dc clearly behind transverse scutal suture), acr in 8 somewhat irregular rows, uniformly short hair–like; prsc longer than 1st post–sutural dc. Legs yellow; tarsomeres 2–5 brownish yellow. Fore femur with 5 strong pv, 10 pd, and ctenidium with 12 short bristles; fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 5-6 a and 1 app; mid tibia with 1 strong preapical ad, 5-6 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 apv; 1st tarsomere with rows of short and dense v. Wing ( Fig. 7 ) tinged yellowish, spots on R2+3, R4+5 and M1+2 confluent and forming a wide transverse band, extending to extreme vein tip; a small triangular hyaline mark on costa between apical spots on R2+3 and R4+5 distinct or absent; spot on dm-cu indistinctly confluent with basal extremity of apical spot on R4+5, M1+2 with a small hyaline area beyond dm-cu; a spot on dm-cu constricted at middle; subcostal cell brown; 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 3.7: 1.0: 0.7; r-m before middle of discal cell; ultimate and penultimate sections of M1+ 2 in proportion of 2.1: 3.2; ultimate section of CuA1 about 1/6 of penultimate. Halter yellow.

Abdomen brownish yellow. Male tergites 2–6 each with dark posterior margin. Male genitalia ( Figs. 26– 30 ): protandrium semicircular; surstylus long, basally with a small acute process, apically strongly tortile with an acute tip; hypandrium very short and nearly H–shaped, hypandrial apodeme distinct but weak; gonopod slender with many small spines and hairs; aedeagal apodeme slightly shorter than aedeagus, aedeagus with a short triangular apical incision.

FEMALE. Unknown.

Type material. Holotype male, Hainan: Wuzhishan National Nature Reserve, Dengshandao (1000 m), 17. V. 2007, Kuiyan Zhang. Paratypes: 1 male, Hainan: data same as holotype; 2 males, Hainan: Wuzhishan National Nature Reserve, Shuimanxiang (600 m), 16. V. 2007, Jingxian Liu; 1 male, Hainan: Jianfengling National Nature Reserve, Zhiwuyuan (800 m), 5/ 7. IV. 2007, Jingxian Liu; 1 male, Hainan: Bawangling National Nature Reserve, Donger station (1000 m), 21. X. 2007, Ding Yang; 1 male, Hainan: Wuzhishan National Nature Reserve, Guanshantai (600 m), 29. X. 2007, Xingyue Liu.

Distribution. China (Hainan).

Remarks. The new species is very similar to Homoneura (Neohomoneura) incompleta Malloch from China (Hainan), Viet Nam and Indonesia (Sumatra) in spots on R2+3, R4+5 and M1+2 confluent and forming a wide transverse band, but it can be separated from the latter by M1+2 with a small hyaline area beyond dm-cu and the surstylus strongly tortile with an acute tip. In incompleta , M1+2 has a large hyaline area beyond dm-cu; and the surstylus is not tortile but with a bifurcated tip ( Sasakawa, 2001).

Etymology. Latin, feminine, ‘ tortilis ’ = tortile, referring to the tortile surstylus.

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 26 – 30. Homoneura (Neohomoneura) tortilis sp. nov. Male. 26. protandrium and epandrium, lateral view; 27. protandrium, anterior view; 28. epandrium, posterior view; 29. aedeagal complex, ventral view; 30. aedeagal complex, lateral view.