Tipula (Vestiplex)

Ren, Jinlong, Li, Yan & Yang, Ding, 2021, Two new species of Tipula (Vestiplex) Bezzi (Diptera, Tipulidae) from Northwest China, Zootaxa 4903 (3), pp. 373-392 : 374-375

Key to species (males) of Tipula (Vestiplex) from Northwest China

1. Wing normal, suitable for flight......................................................................... 2

– Wing reduced to a small flake.......................................................................... 17

2. Tergite 9 divided by pale membrane ( Fig. 44 )........................................... T. (V.) shaanxiana sp. nov.

– Tergite 9 modified with tergal saucer..................................................................... 3

3. Lobe of gonocoxite present ( Figs 4 , 25 , 36 )................................................................ 4

– Lobe of gonocoxite absent ( Fig. 11 )...................................................................... 8

4. Antenna reaching just base of wing if bent backward ( Fig. 33 )................................................. 5

– Antenna reaching beyond base of abdomen if bent backward ( Figs 1 , 22 )........................................ 6

5. General body coloration brownish-yellow; first flagellomere yellow ( Fig. 33 ); posterior margin of tergal saucer without spine ( Fig. 37 )...................................................................... T. (V.) scripta Meigen, 1830

– General body coloration blackish; first flagellomere black; posterior margin of tergal saucer with an acute median spine................................................................................. T. (V.) mediovittata Mik, 1889

6. Antenna reaching middle of body if bent backward; clasper of gonostylus with acute spine at lateral margin....................................................................................... T. (V.) pallitergata Alexander, 1934

– Antenna reaching base of abdomen if bent backward; clasper of gonostylus without spine at lateral margin.............. 7

7. The lateral margin of tergite 2 ocherous, sparsely pruinose; anterior part of tergite 9 with two protrusions ( Figs 1 , 5 )............................................................................. T. (V.) coquillettiana Alexander, 1924

– The lateral margin of tergite 2 yellow; anterior part of tergite 9 with four protrusions ( Figs 22 , 26 ).................................................................................................... T. (V.) quadricorna sp. nov.

8. Nasus absent........................................................................................ 9

– Nasus present....................................................................................... 11

9. Body brownish-yellow; abdomen reddish-yellow.................................... T. (V.) kozlovi Savchenko, 1960

– Body grayish-black; abdomen grayish-black or black........................................................ 10

10. Body length 8.5 mm; first tergite covered with long black setae; each flagellomere except first one without outwarding protrusions at apex................................................................ T. (V.) setigera Savchenko, 1960

– Body length 14.5–16 mm; first tergite without long black setae; each flagellomere, except first one, with strongly outwarding protrusions at apex............................................................ T. (V.) nubila Savchenko, 1960

11. Antenna 13-segmented............................................................................... 12

– Antenna 15-segmented............................................................................... 13

12. Antenna reaching slightly beyond base of abdomen if bent backward; body length 16–19 mm; tergal saucer of tergite 9 with a horn-like protrusion at latero-posterior margin ( Figs 8 , 12 )......................... T. (V.) kuwayamai Alexander, 1921

– Antenna reaching middle of abdomen if bent backward; body length 9.5–11.5 mm; tergal saucer of tergite 9 without protrusion at latero-posterior margin...................................................... T. (V.) pauxilla Savchenko, 1960

13. Antenna reaching base of wing or slightly beyond if bent backward............................................ 14

– Antenna reaching base of abdomen if bent backward........................................................ 15

14. Abdomen with wide, vague brown dorsal stripe; each flagellomere, except first one, with extremely outwarding protrusions at apex; posterior margin of tergite 9 smooth without serrated protrusion............. .. T. (V.) virgatula virgatula Riedel, 1913

– Abdomen with a narrow, brown dorsal stripe; each flagellomere, except first one, without outwarding protrusions at apex; posterior margin of tergite 9 with serrated protrusion.............................. T. (V.) coronifera Savchenko, 1960

15. Body length 13.5–15.0 mm; nasus blunt, equals to 1/4–1/5 length of the rostrum; clasper of gonostylus with a yellow rodshaped projection............................................................. T. (V.) aestiva Savchenko, 1960

– Body length 17.0–22.0 mm; nasus sharp, longer than 1/4 length of the rostrum; clasper of gonostylus without rod-shaped projection............................................................................................. 16

16. First flagellomere yellow; tergite 9 with an elevated ridge; posterior margin of tergite 9 with serrated protrusion........................................................................................ T. (V.) leucoprocta Mik, 1889

– First flagellomere black; tergite 9 without elevated ridge; posterior margin of tergite 9 smooth without serrated protrusion................................................................... T. (V.) virgatula montivaga Savchenko, 1960

17. Antenna 15-segmented, reaching beyond middle of abdomen if bent backward; body length 7.5–8.0 mm; tergal saucer with an elevated median ridge........................................................... T. (V.) aptera Savchenko, 1955

– Antenna 13-segmented, reaching just base of abdomen if bent backward; body length 11.5–12.0 mm; tergal saucer without median ridge............................................. T. (V.) opilionimorpha opilionimorpha Savchenko, 1955

Figures

FIGURES 43–46. Tipula (Vestiplex) shaanxiana sp. nov. 43: hypopygium, lateral view; 44: tergite 9, dorsal view; 45: hypopygium, ventral view; 46: lobe and clasper of gonostyli, lateral view. Scale bars: 0.5 mm (43–45), 0.1 mm (46).

FIGURES 4–7. Tipula (Vestiplex) coquillettiana. 4: hypopygium, lateral view; 5: tergite 9, dorsal view; 6: hypopygium, ventral view; 7: lobe and clasper of gonostyli, lateral view. Scale bars: 0.5 mm (4–6), 0.1 mm (7).

FIGURES 25–29. Tipula (Vestiplex) quadricorna sp. nov. 25: hypopygium, lateral view; 26: tergite 9 and proctiger, dorsal view; 27: hypopygium, ventral view; 28: clasper of gonostylus; 29: lobe and clasper of gonostyli with apex of gonocoxite, lateral view. Scale bars: 0.5 mm (25–27), 0.1 mm (28, 29).

FIGURES 36–39. Tipula (Vestiplex) scripta. 36: hypopygium, lateral view; 37: tergite 9, dorsal view; 38: hypopygium, ventral view; 39: lobe and clasper of gonostyli with apex of gonocoxites, lateral view. Scale bars: 0.5 mm (36–38), 0.1 mm (39).

FIGURES 11–14. Tipula (Vestiplex) kuwayamai. 11: hypopygium, lateral view; 12: tergal saucer of tergite 9, dorsal view; 13: hypopygium, ventral view; 14: lobe and clasper of gonostyli, lateral view. Scale bars: 0.5 mm (11–13), 0.1 mm (14).

FIGURES 33–35. Tipula (Vestiplex) scripta. 33: male habitus, lateral view; 34: head and thorax, dorsal view; 35: right wing. Scale bars 1.0 mm.

FIGURES 1–3. Tipula (Vestiplex) coquillettiana. 1: male habitus, lateral view; 2: head and thorax, dorsal view; 3: right wing. Scale bars 1.0 mm.

FIGURES 22–24. Tipula (Vestiplex) quadricorna sp. nov. 22: male habitus, lateral view; 23: head and thorax, dorsal view; 24: right wing. Scale bars 1.0 mm.

FIGURES 8–10. Tipula (Vestiplex) kuwayamai. 8: male habitus, lateral view; 9: head and thorax, dorsal view; 10: right wing. Scale bars 1.0 mm.