Homoneura (Homoneura) triangulata, Shi, Li & Yang, Ding, 2014

Shi, Li & Yang, Ding, 2014, Supplements to species groups of the subgenus Homoneura in China (Diptera: Lauxaniidae: Homoneura), with descriptions of twenty new species, Zootaxa 3890 (1), pp. 1-117 : 45-46

Homoneura (Homoneura) triangulata sp. nov.

( Fig 21 , 305–309 )

Diagnosis. Antennal 1st flagellomere yellow. Wing clear. Abdominal tergite 5 with a pair of black round lateral spots.

Description. MALE. Body length 2.6–3.2 mm, wing length 2.7–3.3 mm. FEMALE. Body length 2.6 mm, wing length 2.7 mm.

Head yellow. Frons as long as wide and parallel-sided, without pale brown stripes; ocellar triangle pale brown; oc hair-like, shorter than 1/2 anterior or, anterior or slightly shorter than length of posterior or; gena about 1/5 height of eye. Antenna yellow, 1.4 times longer than high; arista black except for brownish base, ray short plumose, with longest ray as long as 1/2 height of 1st flagellomere. Proboscis yellow and palpus yellow except for brown apical margin.

Thorax. Mesonotum without brown medial stripes; 0+3 dc (1st post-sutural dc behind transverse suture), acr in irregular 10 rows; prsc shorter than 1st post-sutural dc. Scutellum pale yellow. Legs yellow. Fore femur with 4 strong pv and 6 pd, ctenidium with 11 short setae; fore tibia with 1 long preapical ad and 1 short apv. Mid femur with 6 a and 1 app; mid tibia with 1 strong preapical ad and 2 strong apv. Hind femur with 1 preapical ad; hind tibia with 1 preapical ad and 1 short apv. Wing ( Fig. 21 ) clear, 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) sections in proportion of 5.3:1.3:1; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.1:1; ultimate section of CuA1 about 1/4 of penultimate. Halter yellow.

Abdomen yellow, tergite 5 with a pair of black round lateral spots, diameter of spot as long as height of exposed part of tergite 5. Male genitalia ( Figs 305–309 ): syntergosternite circular, with two setulae around spiracle; epandrium broad in lateral view; surstylus triangular with two short apical setae; hypandrium wide transverse barlike, hypandrial apodeme short; pregonite and postgonite absent; aedeagus wide basally, narrow apically with a pair of acute dorsoapical processes.

FEMALE. Unknown.

Type material. Holotype ♂ ( CAUC), CHINA, Hainan Province: Baisha, Yinggeling National Nature Reserve, Hongmao village, 430 m, 22. V. 2007, Junhua Zhang. Paratypes: 1 ♂, 1 ♀ ( CAUC), CHINA, Hainan Province: Baisha, Yinggeling National Nature Reserve, Hongmao village, 430 m, 20. V. 2007, Kuiyan Zhang.

Distribution. China (Hainan)

Remarks. The new species is very similar to Homoneura (Homoneura) nudifrons (Kertész) from China ( Taiwan) and Malaysia (Borneo) in wing without spots and abdominal tergites 5 with a pair of black spots, but it can be separated from the latter by the surstylus being triangular with two short apical setae; the pregonite and postgonite being absent; the aedeagus having a pair of acute apical processes. In H. (H.) nudifrons , the surstylus is lobe-like without two short apical setae; the pregonite is short and furcated apically, the postgonite is long subuliform; the aedeagus is round without acute apical processes. ( Kertész, 1913; Malloch, 1929: fig. 53; Sasakawa, 1992).

Etymology. Latin, triangulata , meaning triangular, referring to the surstylus triangular with two apical setae; a feminine adjective.

Figures

FIGURES 13 – 24. Wing. 13. H. (H.) levis (Wiedemann, 1830); 14. Homoneura (Homoneura) longifurcata sp. nov.; 15. H. (H.) noticomata sp. nov.; 16. H. (H.) pseudograndis Papp & Gaimari, 2013; 17. H. (H.) quadristriata sp. nov.; 18. H. (H.) shunxica sp. nov.; 19. H. (H.) subulifera sp. nov.; 20. H. (H.) tianjingshanica sp. nov.; 21. H. (H.) triangulata sp. nov.; 22. H. (H.) triprocessa sp. nov.; 23. H. (H.) zhangjiajiensis sp. nov.; 24. H. (H.) zhejiangensis sp. nov.

FIGURES 305 – 309. Homoneura (Homoneura) triangulata sp. nov. Male. 305. syntergosternite and epandrium, lateral view; 306. syntergosternite, anterior view; 307. epandrial complex, posterior view; 308. aedeagal complex, ventral view; 309. aedeagal complex, lateral view. Scale bar = 0.1 mm.