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

Figs 21–25 , 26–30 Chinese name: 江津同脉缟蝇

Type material.

Holotype: ♂, China, Chongqing City, Jiangjin District, Simianshan Natural Reserve , Zhengqiangou , 28 ° 36 ' 59.54 " N, 106 ° 26 ' 25.88 " E, 1273 m, 14. VI. 2022, leg. Xulong Chen. Paratypes: 1 ♂, same data as holotype.

Etymology.

The specific name refers to the type locality Jiangjin District.

Diagnosis.

Basal margin of brown apical spot on R 2 + 3 at same vertical level as crossvein dm-cu; brown apical spots on R 2 + 3, R 4 + 5, and M 1 entirely separated. Syntergosternite with several setulae above right spiracle, ventral process with several hairs at middle. Surstylus consisting of a long spinous process and a hairy blunt process in lateral view. Hypandrium with a pair of tooth-like ventral processes at middle. Pregonite consisting of a short spinous process and a long curved spinous process, postgonite curved and spine-like in lateral view. Phallus with a subapical tooth in lateral view.

Description.

Male. Body length 7.0– 7.1 mm, wing length 6.9 mm.

Head (Fig. 21 ) 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 as long as height of first flagellomere. Proboscis and palpus yellow.

Thorax (Fig. 24 ) yellow, with gray pruinosity. 0 + 3 dorsocentral setae, anteriormost postsutural dorsocentral seta far from scutal suture, acrostichal setulae in ten irregular rows. Legs yellow. Fore femur with ten posterior dorsal setae, five or six posterior ventral setae and ctenidium with 16 short setae; fore tibia with one dorsal preapical seta and one short apical ventral seta. Mid femur with five anterior setae and one apical posterior seta; mid tibia with one dorsal preapical seta and three strong apical ventral setae. Hind femur with several weak anterior ventral setae and one preapical anterior dorsal seta; hind tibia with one weak dorsal preapical seta and one short apical ventral seta. Wing (Fig. 22 ) slightly yellow, basal margin of brown apical spot on R 2 + 3 at same vertical level as crossvein dm-cu; brown apical spots on R 2 + 3, R 4 + 5, and M 1 entirely separated; brown median spot on R 4 + 5 separated from 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 4: 1.2: 0.8; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.1: 1; ultimate section of CuA 1 ~ 1 / 7 of penultimate. Haltere yellow.

Abdomen (Fig. 25 ) yellow. Male genitalia (Figs 26–30 ): syntergosternite circular with a trapeziform ventral process, with several dorsal setulae and several setulae above right spiracle, ventral process with several hairs at middle. Epandrium broad in lateral view; surstylus consisting of a long spinous process and a blunt and hairy process in lateral view. Hypandrium H-shaped, with a pair of tooth-like ventral processes at middle. Pregonite consisting of a short spinous process and a long curved spinous process, postgonite curved and spine-like in lateral view. Phallus curved backwards, with a subapical tooth in lateral view. Phallapodeme shorter than phallus.

Female. Unknown.

Distribution.

China (Chongqing).

Remarks.

The new species resembles Homoneura (Homoneura) caoi in the habitus, mesonotum with acrostichal setulae in ten irregular rows and brown apical spots on R 2 + 3, R 4 + 5, and M 1 entirely separated [see Wang et al. 2012: figs 12, 14, 15], but it can be distinguished from the latter by the following: fore femur with ten posterior dorsal setae and ctenidium with 16 short setae; subcostal cell pale brown apically; abdominal tergites 2–5 without brown posterior margin; syntergosternite with several setulae above right spiracle; surstylus consisting of a long spinous process and a blunt hairy process in lateral view; hypandrium with a pair of tooth-like ventral processes at middle; pregonite consisting of a short spinous process and a long curved spinous process, postgonite curved and spine-like in lateral view. In H. (H.) caoi , fore femur with seven or eight posterior dorsal setae and ctenidium with 12 or 13 short setae; subcostal cell hyaline; abdominal tergites 2–5 with brown posterior margin; syntergosternite without setula around spiracle; surstylus trifurcated; gonopod with three inwardly curved arc-shaped processes [see Wang et al. 2012: figs 12, 15, 16, 19, 20, 21].

Figures

Figures 21–25. Homoneura (Homoneura) jiangjinensis sp. nov. male 21 head, anterior view 22 wing 23 habitus, lateral view 24 thorax, dorsal view 25 abdomen, dorsal view.

Figures 26–30. Homoneura (Homoneura) jiangjinensis sp. nov. male 26 syntergosternite and epandrium, lateral view 27 epandrial complex, posterior view 28 syntergosternite, anterior view 29 phallic complex, ventral view 30 phallic complex, lateral view. Scale bar: 0.5 mm.