Nephrotoma beibengensis sp. nov.

Yang, Qi-Cheng, Liu, Qi-Fei, Pan, Zhao-Hui, Liu, Xiao-Yan & Yang, Ding, 2020, Nephrotoma Meigen (Diptera, Tipulidae) from Xizang Autonomous Region, China, ZooKeys 973, pp. 123-151 : 123

Nephrotoma beibengensis sp. nov. Figs 1-3 , 4-9 , 60

Diagnosis.

Frontal tubercle raised into discoid protuberance. Occipital marking dark brown, square, anteriorly extending to eye. Mediotergite with an I-shaped, dark-brown, longitudinal stripe. Legs approximately three times as long as body (Figs 1 , 2 ). Posterior extension of tergite 9 slightly depressed with two pairs of short, obtuse projections bearing tiny, black spines, medial pair slightly longer than lateral pair (Figs 7 , 8 ).

Material examined.

Holotype male (CAU), China: Xizang, Motuo (Medog, Metok), Beibeng, 2017.VI.11, 859 m, Qicheng Yang (light trap). Paratype 1 male (CAU), China: Xizang, Motuo, Beibeng, Gelincun, 2018.VI.27, 1400 m, Qicheng Yang (light trap).

Description.

Male (n = 2): body length 10.4-10.5 mm, wing length 10.0 mm, antenna length 2.5 mm.

Head (Figs 1 , 2 ). Mainly yellow. Frontal tubercle raised into discoid. Occipital marking dark brown, square, extended anteriorly to inner margin of eye. Rostrum yellow and nasus brown. Hairs on head black. Antenna brownish yellow, base of each segment darker; first flagellomere 1.3 times longer than second one. Proboscis brownish yellow, with black hairs. Palpus brown, with black hairs.

Thorax (Figs 1 , 2 ). Mainly yellow. Pronotum yellow, lateral side dark brown, with yellow hairs. Prescutum with three black, longitudinal stripes; anterior end of lateral prescutal stripe bent outward, outer part brown and dull; prescutum with posterolateral dark-brown margin. Scutum with two black spots. Scutellum dark brown, with two triangular, yellow spots anteriorly. Mediotergite with an I-shaped, dark-brown marking. Anepisternum and katepisternum yellow. Anepimeron yellow with brown spot at antero-dorsal corner. Parascutellum pale brown. Anatergite brown; katatergite yellow. Meron yellow. Hairs on thorax dark yellow. Legs long, approximately three times as long as body, yellow except apices of tibiae and tarsi dark brown; hairs brown. Wing subhyaline, tinged with light brown; pterostigma pale with macrotrichiae; cell m1 shortly petiolate, virtually invisible; apices of R5 not curve up (Fig. 3 ). Halter with stem brownish yellow; knob pale yellow.

Abdomen (Fig. 1 ). Mainly yellow. Tergites each with dark-brown, median spot and lateral, longitudinal stripe; median spot nearly square on tergite 1, fan-shaped on tergite 2, and those on tergite 3-7 triangular. Sternite 8 dark brown. Hairs on abdomen blackish.

Hypopygium (Figs 4-9 ) mainly brown, posterior margin yellow. Posterior margin of tergite 9 medially produced with a deep notch, apices of produced part slightly depressed, with a pair of pointed lateral projections (Figs 7 , 8 ). Mid-posterior margin of sternite 8 depressed, with round process (Fig. 9 ). Gonapophyses of adminiculum twisted (Fig. 9 ). Outer gonostylus fleshy, small, with curly tip (Fig. 6 ). Inner gonostylus with large concavity at base; beak slightly obtuse, slightly produced at top (Fig. 5 ).

Distribution.

China (Xizang).

Remarks.

This new species is similar to N. globate Alexander, 1951 from India, but the latter differs in the following characters: tergite 9 with lateral projections tipped with two or three spicules; outer gonostylus long and slender; inner gonostylus long and narrow, lower beak like a slender blackened rod; sternite 8 with two tufts of hair.

Etymology.

This species is named after the type locality, Beibeng, Xizang, China.

Figures

Figures 1 - 3. Nephrotoma beibengensis sp. nov. 1 Male habitus, lateral view 2 head and thorax, dorsal view 3 wing. Abbreviations: ptstg = pterostigma. Scale bars: 1.0 mm.

Figures 4 - 9. Nephrotoma beibengensis sp. nov. 4 Hypopygium, lateral view 5 inner gonostylus, lateral external view 6 outer gonostylus, lateral external view, before softened 7 tergite 9, dorsal view, softened 8 tergite 9, dorsal view. before softened 9 hypopygium, ventral view. Abbreviations: bk = beak, d ct = dorsal crest, gp = gonapophyses, l bk = lower beak, i gonst = inner gonostylus, o b lb = outer basal lobe, o gonst = outer gonostylus, pct = posterior crest, tg = tergite, st = sternite. Scale bars: 0.5 mm (4, 7 - 9); 0.1 mm (5, 6).

Figures 60 - 62. Ecograph. 60 Nephrotoma beibengensis sp. nov. 61 Nephrotoma xizangensis Yang & Yang, 1987 (variation) 62 Nephrotoma nigrohalterata Edwards, 1928 (mating) (60, 61 by Zhenqi Song 62 by Qicheng Yang).