Homoneura (Homoneura) chongqingensis, You & Chen & Li, 2023

You, Pengyan, Chen, Xulong & Li, Wenliang, 2023, Four new species of the subgenus Homoneura from Yintiaoling Nature Reserve China (Diptera: Lauxaniidae: Homoneura), Zootaxa 5257 (1), pp. 143-159 : 150

Homoneura (Homoneura) chongqingensis sp. nov. ( Figs 11–20 )

Diagnosis. Mesonotum with acrostichal setulae in six rows. Wing with brown apical spot on R 4+5 and M 1 slightly confluent and forming pale brown connecting area between two apical spots; apical spot on R 2+3 separated from apical spot on R 4+5. Surstylus short and narrow, situated at subapical of epandrium in lateral view. Pregonite furcated apically in ventral view, postgonite curved apically. Phallus broad in lateral view, and with a triangular process subapically.

Description. MALE. Body length 5.7–6.0mm, wing length 6.4–6.6mm. FEMALE. Body length 6.3–6.5mm, wing length 6.3–6.5mm.

Head ( Fig. 11 ) yellow. Frons as long as wide and parallel-sided, with a pair of pale brown stripes extending to sides of ocellar triangle; ocellar triangle yellow, ocellar seta developed, longer than anterior fronto-orbital seta, anterior fronto-orbital seta slightly shorter than posterior fronto-orbital seta. Gena about 1/7 height of eye. Antenna yellow, first flagellomere about 1.9 times longer than high, pale yellow; arista brown except yellow at base, plumose, with longest ray slightly shorter than height of first flagellomere. Proboscis yellow, with pale yellow and black setulae; palpus yellow, with black setulae.

Thorax ( Fig. 14 ) yellow, with gray pruinosity. 0+3 dorsocentral setae, anteriormost postsutural dorsocentral seta far from scutal suture, acrostichal setulae in six rows. Legs pale yellow. Fore femur with five posterior dorsal setae, four posterior ventral setae and ctenidium with ten short setae; fore tibia with one dorsal preapical seta and one apical ventral seta. Mid femur with five anterior setae and one apical posterior seta; mid tibia with one strong dorsal preapical seta and one strong apical ventral seta. Hind femur with one preapical anterior dorsal seta; hind tibia with one weak dorsal preapical seta and one short apical ventral seta. Wing ( Fig. 12 ) slightly yellow, basal margin of brown apical spot on R 2+3 distinctly behind vertical level of crossvein dm-cu; brown apical spot on R 4+5 and M 1 slightly confluent and forming pale brown connecting area between two apical spots; apical spot on R 2+3 separated from apical spot on R 4+5; brown median spot on R 4+5 slightly fused with brown cloud-like spot on crossvein dm-cu; subcostal cell brown apically; costa with 2nd (between R 1 and R 2+3), 3rd (between R 2+3 and R 4+5), and 4th (between R 4+5 and M 1) sections in proportion of 3.2mm: 0.9mm: 0.7mm; r-m distinctly before middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 2.0mm: 1.4mm; ultimate section of CuA 1 about 1/7 of penultimate. Haltere pale yellow.

Abdomen ( Fig. 15 ) yellow, tergites 1–2 pale yellow. Male genitalia ( Figs. 16–20 ): syntergosternite circular. Epandrium broad in lateral view; surstylus short and narrow, situated at subapical of epandrium in lateral view. Pregonite furcated apically in ventral view, postgonite curved apically. Phallus broad in lateral view, and with a triangular process subapically. Phallapodeme longer than phallus.

Type material. Holotype male, China, Chongqing: Wuxi County, Yintiaoling Nature Reserve, Lanying Town , Huangcaoping , 31°24′58″N, 109°55′25″E, elev. 2039 m, 2022. VIII. 14, leg. Xulong Chen. Paratypes: 3 males and 4 females, same data as holotype .

Etymology. The specific epithet is named for the Chongqing Municipality.

Distribution. China (Chongqing).

Remarks. The new species is somewhat similar to H. (H.) longicurva Gao & Shi, 2019 from Shaanxi and Hubei of China, but it can be separated from the latter by the arista with longest ray slightly shorter than height of first flagellomere; surstylus short and narrow in lateral view. In H. (H.) longicurva , the arista with longest ray as long as 4/5 height of first flagellomere; surstylus long and curved at apex in lateral view.

The new species is somewhat similar to H. (H.) henanensis Yang, Zhu & Hu, 1999 from Beijing, Hebei, Henan and Shaanxi of China, but it can be separated from the latter by the mesonotum with acrostichal setulae in six rows; ctenidium with ten short setae on fore femur; brown median spot on R 4+5 slightly fused with brown cloud-like spot on crossvein dm-cu; surstylus short and narrow in lateral view. In H. (H.) henanensis , the mesonotum with acrostichal setulae in eight rows; ctenidium with 12 short setae on fore femur; brown medial spot on R 4+5 separated from brown cloud on crossvein dm-cu; surstylus consisting of a small acute apical process and a slender knife-like process in lateral view.

Figures

FIGURES 11–15. Homoneura (Homoneura) chongqingensis sp. nov. Male. 11. head, anterior view; 12. wing; 13. habitus, lateral view; 14. thorax, dorsal view; 15. abdomen, dorsal view.

FIGURES 16–20. Homoneura (Homoneura) chongqingensis sp. nov. Male. 16. syntergosternite and epandrium, lateral view; 17. epandrial complex, posterior view; 18. syntergosternite, anterior view; 19. aedeagal complex, ventral view; 20. aedeagal complex, lateral view. Scale 0.5 mm.