Antocha (Antocha) setigera Alexander, 1933

Lv, Hanhuiying, Sun, Juan, Wang, Ning, Yang, Ding & Zhang, Xiao, 2023, New species and records of the genus Antocha Osten Sacken (Diptera, Limoniidae) from Tibet, China with a key to species in Qinghai-Tibet region, ZooKeys 1156, pp. 53-69 : 53

Antocha (Antocha) setigera Alexander

Figs 4 , 5

Antocha (Antocha) setigera Alexander 1933b: 369 (original description).

Type material examined.

Holotype: China • ♂; Sichuan province, Mount Omei; 2134 m a.s.l.; 17 July 1931; Franck leg; USNM. Other material examined: China • 8 ♂♂ 6 ♀♀; Tibet Autonomous Region, Chayu County, Xiachayu Farm Hydropower Station; 28°30'19"N, 97°01'25"E; 1520 m a.s.l.; 8 July 2016; Shaolin Han leg; CAU.

Diagnosis.

Antocha (A.) setigera can be recognized by thorax with four brown stripes, wing lacking a stigma, basal section of M3 as long as m-m, and slightly curved outer gonostylus with blackened, blunt tip. Aedeagal complex with interbase distally small and parameres apically fused, arch-shaped.

Description.

Male. Body length 4.5-5.0 mm, wing length 5.0-6.0 mm, antenna length 1.5-1.8 mm.

Head (Fig. 4b ). Dark brown with brown setae. Antenna brown with light brown scape. Scape cylindrical; pedicel and flagellomeres elongate oval, apically tapering; terminal segment short, about half as short as other segments. Rostrum yellow; palpus light brown; setae on rostrum and palpus brown.

Thorax (Fig. 4c ). Pronotum brown. Prescutum and presutural scutum brown four brown stripes. The central stripes fused in the anterior third, the rest is separated by pale narrow vitta. Postsutural scutum dark brown, middle area yellow, scutal lobes each with brown spot. Scutellum pale yellow, with side edges dark brown. Mediotergite brown to dark brown. Pleuron brown (Fig. 4a ). Legs with fore coxa brown; mid coxa brownish yellow; hind coxa yellow; trochanters yellow; femora and tibiae brownish yellow; tarsi brown with terminal segments darker brown. Wing light brown, without stigma; anal angle nearly right-angled (Fig. 4d ). Veins brown. Venation: Sc ending nearly at fork of Rs; basal section of R5 about twice as long as r-m; m-cu shortly before fork of M, distance approximately 1/3 its own length; basal section of M3 as long as m-m; cell m1 longer than cell dm. Halter pale with stem light yellow.

Abdomen. Tergites dark brown. Sternites 1-6 brown with side edges yellow, sternites 7 and 8 dark brown.

Hypopygium (Figs 4e , 5 ). Yellow. Posterior margin of tergite 9 convex with middle slightly emarginate (Fig. 5a ). Gonocoxite nearly cylindrical with long brown setae (Figs 4e , 5 ). Outer gonostylus slightly curved, with blackened distal half and tip sclerotized and blunt. Inner gonostylus slightly curved. Interbase distally flattened, small and horn-like with tip sharp (Figs 4e , 5 ). Parameres apically fused, arch-shaped. Inner branch of paramere elongated, with tip narrowly obtuse (Figs 4e , 5 ). Aedeagus curved ventrally, tip bifid (Figs 4e , 5 ).

Female. Body length 4.5-5.5 mm, wing length 5.0-6.0 mm. Generally similar to male by body coloration.

Ovipositor (Fig. 4f ). Tergite 10 yellowish brown with base darker. Cercus brown, tip raised and tapering, apex acute. Hypogynial valve yellowish, reaching sub-tip of cercus.

Distribution.

China (Sichuan, Tibet).

Remarks.

In China, this species was previously only known in Sichuan province and is now recorded in Tibet for the first time. For descriptions and illustrations of this species, also see Alexander (1933b) and Markevičiūtė et al. (2019, 2021).

Figures

Figure 4. Antocha (Antocha) setigera a habitus of male, lateral view b male head, lateral view c male thorax, dorsal view d male wing e aedeagus complex with gonocoxite and gonostyli, dorsal view f female ovipositor, lateral view. Scale bars: 1.0 mm (a); 0.2 mm (b, c); 0.5 mm (d); 0.2 mm (e, f).

Figure 5. Antocha (Antocha) setigera a male hypopygium, dorsal view b male hypopygium, ventral view. Scale bar: 0.1 mm.