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

Figs 51–55 , 56–60 Chinese name: 锯缘同脉缟蝇

Type material.

Holotype: ♂, 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. Paratypes: 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.

Etymology.

The specific name refers to the inner process of surstylus with serrulate margin in posterior view.

Diagnosis.

Basal margin of brown apical spot on R 2 + 3 at same vertical level as crossvein dm-cu. Male tergites 2–5 with blackish brown posterior margin. Syntergosternite with a setula around spiracle. Inner process of surstylus evaginable apically with serrulate margin in posterior view, outer process long spine-like. Pregonite crossed at front of phallus in ventral view, postgonite digitiform and curved apically. Phallus tapering apically in lateral view.

Description.

Male. Body length 7.7 mm, wing length 7.8–7.9 mm.

Head (Fig. 51 ) yellow. Frons as long as wide and parallel-sided; ocellar triangle yellow, ocellar seta developed. Gena ~ 1 / 10 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 pale yellow, palpus yellow.

Thorax (Fig. 54 ) yellow, with gray pruinosity. 0 + 3 dorsocentral setae, anteriormost postsutural dorsocentral seta far from scutal suture, acrostichal setulae in ten rows. Legs yellow. Fore femur with eight posterior dorsal setae, four or five posterior ventral setae and ctenidium with 14 short setae; fore tibia with one dorsal preapical seta and one short apical ventral seta. Mid femur with five or six 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. 52 ) 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 slightly confluent and forming pale brown connecting area between apical spots on R 2 + 3, R 4 + 5, and M 1; brown median spot on R 4 + 5 separated from brown cloud-like spot on crossvein dm-cu; subcostal cell pale brown apically; seven short hairs present at base of R 4 + 5; 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 7.5: 2: 1.5; r-m before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1.1: 1.2. Haltere yellow.

Abdomen (Fig. 55 ) yellow, tergites 2–5 with blackish brown posterior margin. Male genitalia (Figs 56–60 ): syntergosternite circular with a trapeziform ventral process, with several dorsal setulae and setula around spiracle. Epandrium broad in lateral view; surstylus consisting of inner process and outer process, inner process evaginable apically with serrulate margin in posterior view, outer process long spine-like. Hypandrium H-shaped. Pregonite acute apically, crossed at front of phallus in ventral view, postgonite digitiform and curved apically. Phallus tapering apically in lateral view. Phallapodeme shorter than phallus.

Female. Unknown.

Distribution.

China (Chongqing).

Remarks.

The new species resembles Homoneura (Homoneura) anadaequata in the habitus, basal margin of brown apical spot on R 2 + 3 at same vertical level as crossvein dm-cu and mesonotum with acrostichal setulae in ten rows [see Gao and Shi 2019: figs 1, 4, 7], but it can be distinguished from the latter by the following: brown apical spots on R 2 + 3, R 4 + 5, and M 1 slightly confluent; syntergosternite with a setula around spiracle; inner process of surstylus evaginable apically with serrulate margin in posterior view; postgonites symmetrical in ventral view. In H. (H.) anadaequata , brown apical spots on R 4 + 5 and M 1 confluent, separated from apical spot on R 2 + 3; syntergosternite without setula around spiracle; surstylus long and furcated in posterior view; postgonites asymmetrical in ventral view [see Gao and Shi 2019: figs 7, 9, 10, 11].

Figures

Figures 51–55. Homoneura (Homoneura) serrulata sp. nov. male 51 head, anterior view 52 wing 53 habitus, lateral view 54 thorax, dorsal view 55 abdomen, dorsal view.

Figures 56–60. Homoneura (Homoneura) serrulata sp. nov. male 56 syntergosternite and epandrium, lateral view 57 epandrial complex, posterior view 58 syntergosternite, anterior view 59 phallic complex, ventral view 60 phallic complex, lateral view. Scale bar: 0.5 mm.