Antocha (Antocha) tibetana Lv & Zhang, 2023

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) tibetana Lv & Zhang sp. nov.

Figs 8 , 9

Type material.

Holotype: China • ♂; Tibet Autonomous Region, Medog County, 80k; 29°28'47"N, 96°05'19"E; 2104 m a.s.l.; 30 July 2014; Tingting Zhang leg; CAU. Paratypes: China • 1 ♂ 2 ♀♀; Tibet Autonomous Region, Medog County, 80k; 29°28'47"N, 96°05'19"E; 2104 m a.s.l.; 1 Aug. 2014; Tingting Zhang leg; CAU.

Diagnosis.

Antocha (A.) tibetana sp. nov. can be recognized by thorax with three dark brown stripes, wing having indistinct stigma, basal section of M3 about twice as long as m-m, posterior margin of tergite with shallow emargination and outer gonostylus apically claw-shaped. Aedeagal complex with interbase distally horn-like; paramere apically flattened and triangular; inner branch of paramere with tip bifid into two teeth.

Description.

Male. Body length 4.5-5.0 mm, wing length 5.1-5.5 mm, antenna length 1.0-1.2 mm.

Head (Fig. 8b ). Dark brown, with brown setae. Antenna brown, with brown setae. Scape nearly cylindrical; pedicel oval; flagellomeres oval, apically shortened. Rostrum and palpus brown, with brown setae.

Thorax (Fig. 8c ). Pronotum brown. Prescutum and presutural scutum brownish yellow, with three dark brown stripes. Postsutural scutum brownish yellow; scutal lobes each with a brown spot. Scutellum brown, with middle brownish yellow. Mediotergite brown with side edges light brown. Pleuron brownish yellow (Fig. 8a ). Legs with coxae and trochanters yellow; rest of segments brownish yellow. Wing light brownish yellow, with very indistinct stigma; anal angle nearly right-angled (Fig. 8d ). Veins brownish yellow. Venation: Sc ending before fork of Rs, at about 5/6 of Rs; basal section of R5 about 1½ as long as r-m; m-cu shortly before fork of M, distance approximately 1/3 its own length; basal section of M3 about twice as long as m-m; cell m1 longer than cell dm. Halter pale with stem light yellow.

Abdomen. Tergites 1-6 brown, tergites 7 and 8 dark brown. Sternites 1-6 brownish yellow; sternites 7 and 8 dark brown.

Hypopygium (Figs 8e , 9 ). Yellow. Posterior margin of tergite 9 with shallow emargination (Fig. 9a ). Gonocoxite nearly cylindrical with brown setae (Figs 8e , 9 ). Outer gonostylus apically black with tip curved, claw-shaped. Inner gonostylus nearly straight with tip rounded. Interbase nearly V-shaped, distal part flattened and horn-like, with tip blunt (Figs 8e , 9 ). Paramere with base rod-shaped; apical part flattened, triangular in shape. Inner branch of paramere with tip bifid, two teeth almost equal in length (Figs 8e , 9 ). Aedeagus rod-shaped, curved ventrally (Figs 8e , 9 ).

Female. Body length 5.0-5.3 mm, wing length 5.5-5.7 mm. Generally similar to male by body coloration.

Ovipositor (Fig. 8f ). Tergite 10 yellowish. Cercus pale yellow, with base darker; tip raised and tapering. Hypogynial valve yellowish, reaching approximately middle of cercus.

Etymology.

The species is named after the type locality, Tibet.

Distribution.

China (Tibet).

Remarks.

The new species is somewhat similar to A. (A.) spiralis from China and India with the similar wing venation and bifid tip of inner branch of paramere, but it can be easily distinguished by the three stripes on the thorax (Fig. 8c ) and the triangular apex of the paramere (Figs 8e , 9 ). In A. (A.) spiralis , the thorax has no obvious longitudinal stripes (Fig. 6c ), while the apex of the paramere is slender and twisted into a spiral (Figs 6e , 7 ).

Figures

Figure 6. Antocha (Antocha) spiralis 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); 0.3 mm (b); 0.4 mm (c); 0.6 mm (d); 0.2 mm (e, f).

Figure 7. Antocha (Antocha) spiralis a male hypopygium, dorsal view b male hypopygium, ventral view. Scale bar: 0.1 mm.

Figure 8. Antocha (Antocha) tibetana sp. nov. 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); 0.3 mm (b, c); 0.5 mm (d); 0.2 mm (e, f).

Figure 9. Antocha (Antocha) tibetana sp. nov. a male hypopygium, dorsal view b male hypopygium, ventral view. Scale bar: 0.1 mm.