Tipula (Vestiplex) shaanxiana, Ren & Li & Yang, 2021

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 : 387-391

Tipula (Vestiplex) shaanxiana sp. nov.

( Figs 40–53 )

urn:lsid.zoobank.org/ 837812BF-468E-4C20-AAB7-CA7803809A20

Diagnosis. Tubercle on vertex low, divided into two lobes by a narrow groove at middle. Occiput covered with dense black bristles. Antenna 13-segmented, reaching base of wing if bent backward. Prescutum and presutural scutum with one narrow grey stripe at middle. Gonocoxite elongated into a horn-like lobe which has up-turned apex. Posterior margin of tergite 9 divided into two setose lobes; inner margin of each lobe bears two sclerotized protrusions. Apex of sternite 9 with setose foot-like protrusions. Adminiculum point-apexed. Clasper of gonostylus approximately triangular with strongly sclerotized groove along concavity; a semicircular basal lobe produced with staggered setae. Female: posterior margin of hypovalva short and broad, with pointed triangular apex.

Material examined. Type specimens 3 males, 1 female.

Holotype: male, Shaanxi, Foping, Huamuqiao , 33.70°N, 107.92°E, alt. 2000 m, 2006.VII.26, Yajun Zhu (light trap).

Paratypes: 1 male, Shaanxi, Foping, Huamuqiao , 33.70°N, 107.92°E, alt. 2000 m, 2006.VII.26, Yajun Zhu (light trap) ; 1 female, Shaanxi, Foping, Huamuqiao , 33.70°N, 107.92°E, alt. 2000 m, 2006.VII.25, Yajun Zhu (light trap) ; 1 male, Sichuan, Pingwu, Wanglang , 32.91°N, 104.16°E, alt. 2500 m, 2016.VII.31, Yuqiang Xi (light trap) .

Description. Male (N= 3): body length 16–17 mm, wing length 17–20 mm, antenna length 4–5 mm.

Head. Mostly dull brown. Vertex with some dark bristles along eye margin. Tubercle on vertex divided into two lobes by a narrow groove at middle. Occiput covered with dense black bristles ( Fig. 41 ). Rostrum and nasus brown. Antenna 13-segmented, reaching base of wing if bent backward; scape and pedicel dull brown; first flagellomere yellowish-brown, remaining segments dark brown ( Fig. 40 ). Palpus dark brown.

Thorax. Mostly dull brown. Pronotum dull yellow. Prescutum and presutural scutum with four greyish-brown stripes bearing narrow dark brown margins; one narrow grey interval at middle. Scutal lobe with two circular brown spots. Scutellum yellow with one broad dark brown median stripe. Mediotergite grey pruinose with one narrow brown stripe at middle ( Fig. 41 ). Mesopleuron entirely yellow pruinose ( Fig. 40 ). Legs with coxae and trochanters yellow pruinose and setose; femora dark brown with yellow bases; tibiae and tarsi dark brown. Wing whitish subhyaline, variegated with dark brown; costal and subcostal cells pale brown; stigma dark 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 1+2, r 3, r 4, r 5, d and m 3; whitish spots at base of Rs and apex of bm; an oblique whitish marking at base of veins R, M, CuA and CuP ( Fig. 42 ). Halter with stem yellow, knob pale yellow to dark brown.

Abdomen. Basal abdominal segments dull brown. Abdominal segments 5–8 dark brown ( Fig. 40 ). Hypopygium mostly blackish. Setae on abdomen blackish or dull yellow.

Hypopygium. Posterior margin of tergite 9 divided into two setose lobes; inner margin of each lobe bears two sclerotized protrusions which have foot-like inner protrusion and finger-like outer protrusion ( Fig. 44 ). Tergite 9 and sternite 9 fused into a continuous ring ( Fig. 43 ). Gonocoxite elongated into a horn-like lobe which has up-turned apex ( Figs 43, 45 ). Apex of sternite 9 with setose foot-like protrusions ( Fig. 45 ). Adminiculum with pointed apex ( Fig. 45 ). Lobe of gonostylus rod-shaped and setose ( Fig. 46 ). Clasper of gonostylus approximately triangular; beak obtuse; a semicircular basal lobe produced with staggered setae; sclerotized groove bears numerous long bristles along concavity; dorsal crest with numerous long bristles ( Fig. 46 ).

Semen pump. Brown. Posterior immovable apodeme (pia) rod-shaped and directed backward ( Figs 47–49 ); compressor apodeme (ca) large, fan-shaped, directed downwards, forming a 50° angle with posterior immovable apodeme ( Fig. 49 ); anterior immovable apodeme (aia) triangular, point-apexed, narrower than compressor apodeme ( Figs 47, 48 ).

Female (N= 1): body length 26 mm, wing length 23 mm.

Female resembles male in head, thorax and wing. Abdominal tergites 1–5 yellow with one dark brown longitudinal median stripe and two narrow brown lateral stripes. Sternites 6–8 fully dark brown.

Ovipositor reddish-brown. Cercus slender with slightly up-turned apex; outer margin with dense small teeth ( Figs 50, 51 ). Posterior margin of hypovalva short and broad, with pointed triangular apex ( Figs 52, 53 ).

Elevation range in China. Adults were collected at altitudes ranging from 2000 m to 2500 m.

Period of activity. Adults were collected only in late July.

Distribution. China (Shaanxi, Sichuan).

Etymology. The species is named “ shaanxiana ” after the type locality Shaanxi.

Remarks. This new species is similar to T. (V.) adungensis Alexander, 1963 in the shape of tergite 9, lobe and clasper of gonostylus. It can be separated from the latter by following features: posterior margin of tergite 9 with a broad notch; posterior margin of tergite 9 with four protrusions; clasper of gonostylus with an obtuse beak., the posterior margin of tergite 9 has a narrow notch in T. (V.) adungensis ; the posterior margin of tergite 9 has two protrusions; the clasper of gonostylus has a sharp beak ( Alexander, 1963).

Figures

FIGURES 40–42. Tipula (Vestiplex) shaanxiana sp. nov. 40: male habitus, dorsal view; 41: head and thorax, dorsal view; 42: right wing. Scale bars 1.0 mm.

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 47–53. Tipula (Vestiplex) shaanxiana sp. nov. 47: semen pump, dorsal view; 48: semen pump, ventral view; 49: semen pump, lateral view; 50: ovipositor, later view; 51: cercus, dorsal view; 52: ovipositor, ventral view; 53: hypovalva, ventral view. Scale bars: 0.1 mm (47–49), 0.5 mm (50–53).