Antocha, Osten Sacken, 1860

Markevičiūtė, Radvilė, Podenas, Sigitas, Saldaitis, Aidas & Bernotienė, Rasa, 2019, A new species of Antocha Osten Sacken, 1860 (Diptera: Limoniidae) from Sichuan China, Zootaxa 4661 (1), pp. 118-132 : 120

Key to species of the genus Antocha from Sichuan, China (Males)

1 Wing with distinct dark brown or dark gray pterostigma ( Fig. 2 )................................................ 2

– Wing pterostigma indistinct, light gray or missing ( Fig. 1 ).................................................... 6

2 Head dark gray or yellowish-gray........................................................................ 3

– Head pale yellow..................................................................................... 5

3 Legs yellow, only terminal tarsomeres more darkened...................................... A. picturata Alexander

– Legs brownish gray or dark brown....................................................................... 4

4 Gonocoxite oval, apex narrowly elongate ( Figs 6, 7 )....................................... A. fortidens Alexander

– Gonocoxite cone-shaped, apex not narrowly elongate ( Fig. 8 ).................. A. nebulipennis nebulipennis Alexander

5 Apex of outer gonostylus bidentate ( Fig. 10 ); vein m -cu longer than the distance between it and base of cell dm ( Fig. 2 )....................................................................................... A. bidens Alexander

– Apex of outer gonostylus blunt; vein m -cu shorter than the distance between it and cell dm ( Fig. 11 ).................................................................................................... A. nigribasis Alexander

6 Antenna brown or black ( Figs 3, 5 )....................................................................... 7

– Antenna pale yellow ( Fig. 4 )......................................................... A. pallidella Alexander

7 Middle flagellomeres dilated ventrally ( Fig. 3 ).............................................................. 8

– Middle flagellomeres not dilated, oval or fusiform ( Figs 4, 5 ).................................................. 9

8 Paramere twisted into spiral, tip at approximately same level as apex of aedeagus ( Fig. 12 )............................................................................................ A. bella Markevičiūtė & Podenas sp. nov.

– Paramere straight and longer than aedeagus ( Fig. 13 )......................................... A. indica Brunetti

9 Body length less than 7.5 mm; abdominal tergites dark brown or yellowish brown; abdominal sternites brown or yellow.. 10

– Body length exceeds 7.5 mm; abdominal tergites dull black; abdominal sternites gray........... A. flavidibasis Alexander

10 Caudal margin of tergite 9 with extra lobes, bumps or deep U-shaped median notch ( Figs 6, 8, 9 , 14, 15 ).............. 11

– Caudal margin of tergite 9 smooth, without extra lobes or bumps ( Figs 16–21 )................................... 13

11 Caudal margin of tergite 9 of male genitalia with two widely separated tooth-like projections ( Fig. 14 ); outer gonostylus with cleft apex ( Fig. 14 ).................................................................... A. bifida Alexander

– Caudal margin of tergite 9 of male genitalia with two rounded projections or lobes ( Figs 9 , 15 ); outer gonostylus without cleft apex ( Figs 9 , 15 ).................................................................................... 12

12 Caudal margin of tergite 9 with two lateral lobes obliquely truncated, outer angles rounded ( Fig. 9 ); apex of outer gonostylus produced into a foot-shaped enlargement ( Fig. 9 )........................................ A. emarginata Alexander

– Caudal margin of tergite 9 of male genitalia with two rounded projections; outer gonostylus narrowed at apex and strongly curved ( Fig. 15 )...................................................... A. nebulipennis immaculata Alexander

13 Aedeagus with lateral structures ( Figs 16–18 )............................................................. 14

– Aedeagus simple without lateral structures ( Figs 19–21 )..................................................... 16

14 Aedeagus shaped as a lyrate plate, lateral structure not twisted into a complete spiral turn at distal end ( Figs 17, 18 )...... 15

– Lateral structure of aedeagus very slender, twisted into a complete spiral turn at distal end ( Fig. 16 ).. A. spiralis Alexander

15 Aedeagus with each lateral structure stout and powerful, at near midlength on mesal face bearing a stout curved spine ( Fig. 17 )............................................................................. A. constricta Alexander

– Aedeagus with each lateral structure somewhat lyriform, narrowed to acute points, on margin at about one-third the length bearing a slender acute branch ( Fig. 18 ).............................................. A. multidentata Alexander

16 Apex of aedeagus bifid ( Fig. 19 )........................................................ A. setigera Alexander

– Apex of aedeagus not bifid ( Figs 20, 21 )................................................................. 17

17 Aedeagus apex thickened and rounded ( Fig. 20 )........................................ A. lacteibasis Alexander

– Aedeagus apex narrow and curved ( Fig. 21 )........................................... A. minuticornis Alexander

Figures

FIGURES 1–12. Distinctive features of genus Antocha in China, Sichuan. 1. wing (A. bella sp. nov., holotype); 2. wing (A. bidens, holotype); 3. male antenna of genus Antocha; 4. male antenna of genus Antocha; 5. male antenna of genus Antocha; 6. male genitalia, dorsal view (A. fortidens); 7. genital structures (A. fortidens, holotype); 8. male genitalia, dorsal view (A. nebulipennis nebulipennis, metatype); 9. outer gonostylus and male tergite 9 (A. emarginata, holotype); 10. outer gonostylus (A. bidens, holotype); 11. wing (A. nigribasis, paratype); 12. male genitalia, dorsal view (A. bella sp. nov., holotype).

FIGURES 13–21. Male genitalia of genus Antocha in China, Sichuan, dorsal view. 13. A. indica; 14. genital structures and tergite 9 of A. bifida; 15. A. nebulipennis immaculata, holotype; 16. A. spiralis (byAlexander 1932); 17. A. constricta, holotype; 18. A. multidentata, holotype; 19. A. setigera, holotype; 20. A. lacteibasis (by Alexander 1935); 21. A. minuticornis, holotype.