Tipula (Vestiplex) kuwayamai Alexander, 1921

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 : 378-381

Tipula (Vestiplex) kuwayamai Alexander

( Figs 8–21 )

Tipula kuwayamai Alexander, 1921: 130 ;

Tipula (Vestiplex) kuwayamai: Alexander, 1934: 405 ; Savchenko, 1964: 179; Oosterbroek and Theowald, 1992: 156.

Material examined. 1 male, Inner Mongolia, Zuoqi, Helan Mountain, Halawu , 38.67°N, 105.79°E, alt. 2300 m, 2007.VII.10, Gang Yao ; 1 male, Ninaxia, Jingyuan, Liupan Mountain , Hongxialinchang , 35.45°N, 106.28°E, alt. 1900 m, 2008. VI.29, Yongjie Wang ; 1 male, 1 female, Ningxia, Jingyuan, Dongshanpo , 35.62°N, 106.28°E, alt. 2180 m, 2008. VI.22, Gang Yao ; 1 male, Ningxia, Yinchuan, Helan Mountain, Suyukou , 38.75°N, 105.93°E, alt. 2000 m, 2007.VII.4, Qibiao Dong ; 1 female, Ningxia, Jingyuan, Xixia , 35.49°N, 106.28°E, alt. 1900 m, 2008. VI.29, Gang Yao & Tingting Zhang .

Elevation range in China. Adults were collected at altitudes ranging from 1900 m to 2300 m.

Period of activity. Adults are flying in June–July.

Known distribution. China (Inner Mongolia, Ningxia, Qinghai) , Japan (Hokkaido, Honshu), Russia (south) .

Redescription. Male (N= 4): body length 17–19 mm, wing length 16–20 mm, antenna length 4–5 mm.

Head. Mostly greyish pruinose. Vertex with some dark bristles along eye margin ( Fig. 9 ). Tubercle on vertex high and setose with a narrow dark stripe at middle. Occiput greyish pruinose. Rostrum and nasus dark brown. Antenna 13-segmented, reaching base of abdomen if bent backward; scape and pedicel yellow; first flagellomere yellowish-brown, remaining segments dark brown; flagellomeres of some specimens bicolorous, black at base and yellow at apex; each flagellomere except first one with basal enlargement ( Fig. 8 ). Palpus dark brown.

Thorax. Mostly brownish-grey. Pronotum brown with a dark brown stripe at middle ( Fig. 9 ). Prescutum and presutural scutum with four stripes, lateral pair grey while median pair brown, bearing narrow dark brown margins; with one narrow grey interval at middle. Scutal lobe with two circular spots which have brown margins; anterior spot more pruinose than posterior one. Scutellum grey pruinose with a narrow, brown stripe at middle. Mediotergite grey pruinose with broad dark brown stripe at middle ( Fig. 9 ). Mesopleuron entirely grey pruinose ( Fig. 8 ). Legs with coxae grey; trochanters yellowish; femora brown with dark brown tips; tibiae brown with dark brown at bases and apices; tarsi dark brown ( Fig. 8 ); formula of tibial spurs 1–2–2. Wing whitish subhyaline, variegated with dark brown; costal and subcostal cells brownish; stigma brown; dark brown marking along fork of Rs to cross vein r -m; whitish area forming a large C-shaped marking at bases of cells r 3, r 4, r 5, d and m 3 ( Fig. 10 ). Halter with stem brown, knob dark brown.

Abdomen. Mainly yellowish-brown.Abdominal segments 5–8 dark brown; remaining segments brown ( Fig. 8 ). Tergites 1–5 with two dark brown lateral stripes. Hypopygium brown. Setae on abdomen blackish or dull yellow.

Hypopygium. Tergite 9 shaped as a large concave sclerotized saucer. Posterior margin of tergal saucer with a U-shaped notch; median part with ridge which has horn-like lateral protrusions; anterior margin with a rectangular lobe which depressed in central part and having elevated border ( Fig. 12 ). Tergite 9 and sternite 9 fused into a continuous ring. Gonocoxite unarmed ( Fig. 11 ). Apex of sternite 9 with a pair of approximately rhomboidal pointed protrusions ( Figs 11, 13, 14 ). Adminiculum hollow with triangular apex ( Fig. 13 ). Lobe of gonostylus rod-shaped and setose ( Fig. 14 ). Clasper of gonostylus curved and blade-shaped; beak sharp; dorsal crest with horn-like and heavily sclerotized process ( Fig. 14 ).

Semen pump. Brown. Posterior immovable apodeme (pia) rod-shaped and directed backward ( Figs 15, 16 ); compressor apodeme (ca) fan-shaped and directed downward, forming a 60° angle with posterior immovable apodeme ( Fig. 17 ); anterior immovable apodeme (aia) triangular with an obtuse apex; narrower than compressor apodeme ( Figs 15–17 ).

Female (N= 2): body length 20–24 mm, wing length 21–22 mm, antenna length 4–4.5 mm.

Female head, thorax and wing resembles that of male. Tergites 1–5 brown with one median dark brown longitudinal stripe and two narrow, greyish-brown lateral stripes. Sternites 6–8 fully greyish-brown.

Ovipositor reddish-brown. Cercus slender with up-turned tip; outer margin with five large teeth ( Figs 18, 19 ). Hypovalva slender and setiform ( Figs 20, 21 ).

Remarks. Alexander (1921) mentioned identification for female adults by the following characters: ovipositor with five basal and subacute teeth, outer teeth fused into a sinuous blade. These characters are clearly shown in examined specimens ( Figs 18, 19 ). In addition, the setiform hypovalva could be used as an additional diagnostic character ( Figs 20, 21 ).

Figures

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.

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 15–21. Tipula (Vestiplex) kuwayamai. 15: semen pump, dorsal view; 16: semen pump, ventral view; 17: semen pump, lateral view; 18: ovipositor, lateral view; 19: cercus, dorsal view; 20: ovipositor, ventral view; 21: hypovalva, ventral view. Scale bars: 0.1 mm (15–17), 0.5 mm (18–21).