Homoneura (Homoneura) microtricha Chen & Li, 2024

Chen, Xulong, You, Pengyan, Li, Wenliang & Zhang, Zhisheng, 2024, Seven new species of the subgenus Homoneura Malloch (Diptera, Lauxaniidae, Homoneura) from Jiangjin District, southwestern Chongqing, China, ZooKeys 1206, pp. 45-80 : 45-80

Homoneura (Homoneura) microtricha Chen & Li sp. nov.

Figs 31–35 , 36–40 Chinese name: 微毛同脉缟蝇

Type material.

Holotype: ♂, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve , Zhengqiangou , 28 ° 36 ' 59.54 " N, 106 ° 26 ' 25.88 " E, 1273 m, 15. VI. 2022, leg. Xulong Chen. Paratypes: 43 ♂♂ 6 ♀♀, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Zhengqiangou, 28 ° 36 ' 59.54 " N, 106 ° 26 ' 25.88 " E, 1273 m, 14. VI. 2022, leg. Xulong Chen; 1 ♂, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Zhengqiangou, 28 ° 36 ' 59.54 " N, 106 ° 26 ' 25.88 " E, 1273 m, 26. VI. 2022, leg. Pengyan You; 3 ♂♂ 8 ♀♀, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Dahonghai, 28 ° 35 ' 34.27 " N, 106 ° 26 ' 34.93 " E, 1144 m, 15. VII. 2022, leg. Xulong Chen; 5 ♂♂, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Mohuayan, 28 ° 35 ' 15.67 " N, 106 ° 22 ' 7.36 " E, 1017 m, 14. VII. 2022, leg. Xulong Chen; 2 ♂♂ 1 ♀, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Zhenzhutan, 28 ° 35 ' 50.74 " N, 106 ° 25 ' 25.70 " E, 1226 m, 15. VII. 2022, leg. Xulong Chen; 2 ♂♂ 2 ♀♀, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Tudiyan, 28 ° 37 ' 24.45 " N, 106 ° 24 ' 6.69 " E, 1126 m, 15. VII. 2022, leg. Xulong Chen; 1 ♂ 2 ♀♀, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve, Chaoyuanguan, 28 ° 38 ' 53.38 " N, 106 ° 20 ' 23.84 " E, 920 m, 14. VII. 2022, leg. Xulong Chen; 1 ♂, China, Chongqing City, Jiangjin District, Taihe Management and Protection Station, Heishenmiao, 28 ° 48 ' 9.21 " N, 106 ° 15 ' 46.04 " E, 836 m, 14. VII. 2022, leg. Xulong Chen; 1 ♂, China, Chongqing City, Jiangjin District, Dayuandong National Forest Park, Kongzimiao, 28 ° 53 ' 9.68 " N, 106 ° 15 ' 24.28 " E, 709 m, 12. VII. 2022, leg. Xulong Chen; 1 ♂ 1 ♀, China, Chongqing City, Jiangjin District, Dayuandong National Forest Park, Shuijingwan, 28 ° 53 ' 10.96 " N, 106 ° 14 ' 19.32 " E, 717 m, 13. VII. 2022, leg. Xulong Chen; 2 ♂♂ 1 ♀, China, Chongqing City, Jiangjin District, Dayuandong National Forest Park, Tian’ehu, 28 ° 52 ' 54.45 " N, 106 ° 15 ' 14.53 " E, 728 m, 13. VII. 2022, leg. Xulong Chen; 4 ♂♂ 12 ♀♀, China, Chongqing City, Jiangjin District, Dayuandong National Forest Park, Diaojiaolou, 28 ° 53 ' 5.89 " N, 106 ° 15 ' 42.18 " E, 731 m, 13. VII. 2022, leg. Xulong Chen.

Etymology.

The specific name comes from the combination of the prefix micro - (meaning small) and the Latin word, tricha (meaning hair), referring to the surstylus covered by small hairs.

Diagnosis.

Mesonotum with acrostichal setulae in eight irregular rows. Brown apical spots on R 4 + 5 and M 1 slightly confluent, separated from apical spot on R 2 + 3; brown median spot on R 4 + 5 slightly fused with brown cloud-like spot on crossvein dm-cu. Surstylus subuliform in lateral view. Pregonite knife-like in ventral view, connected with postgonite; postgonite long and spine-like in lateral view. Phallus with two pairs of subapical teeth in lateral view.

Description.

Male. Body length 5.8–6.3 mm, wing length 5.6–6.1 mm.

Head (Fig. 31 ) yellow. Frons as long as wide and parallel-sided; ocellar triangle yellow, ocellar seta developed, longer than anterior fronto-orbital seta, anterior fronto-orbital seta shorter than posterior fronto-orbital seta. Gena ~ 1 / 8 height of eye. Antenna yellow, first flagellomere ~ 2.0 × longer than high; arista black except yellow at base, long plumose, with longest ray slightly shorter than height of first flagellomere. Proboscis pale yellow, palpus yellow.

Thorax (Fig. 34 ) yellow, with gray pruinosity. 0 + 3 dorsocentral setae, anteriormost postsutural dorsocentral seta far from scutal suture, acrostichal setulae in eight irregular rows. Legs yellow. Fore femur with seven posterior dorsal setae, four posterior ventral setae, and ctenidium with 14 or 15 short setae; fore tibia with one dorsal preapical seta and one short apical ventral seta. Mid femur with four or five anterior setae and one apical posterior seta; mid tibia with one dorsal preapical seta and three strong apical ventral setae. Hind femur with one preapical anterior dorsal seta; hind tibia with one weak dorsal preapical seta and one short apical ventral seta. Wing (Fig. 32 ) slightly yellow, basal margin of brown apical spot on R 2 + 3 behind vertical level as crossvein dm-cu; brown apical spots on R 4 + 5 and M 1 slightly confluent, separated from apical spot on R 2 + 3; brown median spot on R 4 + 5 slightly fused with brown cloud-like spot on crossvein dm-cu; subcostal cell pale brown apically; costa with 2 nd (between R 1 and R 2 + 3), 3 rd (between R 2 + 3 and R 4 + 5), and 4 th (between R 4 + 5 and M 1) sections in proportion of 9.7: 2.7: 2; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 3: 2.3; ultimate section of CuA 1 ~ 1 / 5 of penultimate. Haltere pale brown.

Abdomen (Fig. 35 ) yellow, tergites 2–5 with pale brown posterior margin. Male genitalia (Figs 36–40 ): syntergosternite circular, with a trapeziform ventral process and with several dorsal setulae. Epandrium broad in lateral view; surstylus hairy, subuliform in lateral view. Hypandrium H-shaped. Pregonite knife-like in ventral view, connected with postgonite; postgonite long and spine-like in lateral view. Phallus with two pairs of subapical teeth in lateral view. Phallapodeme as long as phallus.

Female. Body length 5.9–6.3 mm, wing length 6.0– 6.2 mm.

Distribution.

China (Chongqing).

Remarks.

The new species resembles Homoneura (Homoneura) longiacutata in the habitus and surstylus that is subuliform in lateral view [see Gao and Shi 2019: figs 35, 41–42], but it can be distinguished from the latter by the following: arista with longest ray as long as height of first flagellomere; ultimate section of CuA 1 ~ 1 / 5 of penultimate; hypandrium H-shaped; postgonite long and spine-like in lateral view; phallus not curved backwards apically, without acute tip in lateral view. In H. (H.) longiacutata , arista with longest ray as long as 1 / 2 height of first flagellomere; ultimate section of CuA 1 ~ 1 / 9 of penultimate; hypandrium inverse U-shaped; postgonite short, with two teeth-like processes in lateral view; phallus curved backwards apically and acute at apex in lateral view [see Gao and Shi 2019: figs 36, 40, 44, 45].

Figures

Figures 31–35. Homoneura (Homoneura) microtricha sp. nov. male 31 head, anterior view 32 wing 33 habitus, lateral view 34 thorax, dorsal view 35 abdomen, dorsal view.

Figures 36–40. Homoneura (Homoneura) microtricha sp. nov. male 36 syntergosternite and epandrium, lateral view 37 epandrial complex, posterior view 38 syntergosternite, anterior view 39 phallic complex, ventral view 40 phallic complex, lateral view. Scale bar: 0.1 mm.