Neurigona brevidigitata, Lin & Wang & Yang, 2024

Lin, Chen, Wang, Mengqing & Yang, Ding, 2024, The genus Neurigona Rondani, 1856 (Diptera, Dolichopodidae) from Yunnan, China, with descriptions of seven new species and a key to the species of China, ZooKeys 1190, pp. 319-345 : 319

Neurigona brevidigitata sp. nov.

Figs 3 , 8

Type material.

Holotype: ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 69 ♂♂, 19 ♀♀, the same data as holotype (CAU).

Diagnosis.

Eyes almost contiguous on middle portion of face. Mesonotum with a brown mid-posterior stripe. Postnotum with a nearly W-shaped dark brown spot. Mid tibia and tarsus with row of short dense crochet-like av hairs. Hind tibia with short blackish comb-like apical bristles on very short and plate-like process. Ventral surstylus rather large and broad, ~ 1.5 × wider than dorsal surstylus, apically with four long hairs.

Description.

Male (Fig. 3A ). Body length 5.4 mm, wing length 4.2 mm.

Head metallic green with pale yellow pollinosity; eyes almost contiguous on middle portion of face. Hairs and bristles on head black but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8C ) yellow; first flagellomere somewhat oval, ~ 1.1 × as long as wide, round apically, with brown pubescence; arista subapical, brownish. Proboscis yellow with pale hairs, with two long pale hairs, longer than proboscis; palpus pale yellow, but brownish at basal 1/3, with yellow hairs.

Thorax yellow with fine pale yellow pollinosity; mesonotum with one brown longitudinal stripe at middle posterior region; scutellum brown at margin, with minute brown middle spot at basal margin; postnotum with a nearly W-shaped dark brown spot. Pteropleuron below wing base with a small black spot. Laterotergite with one blackish stripe and one minute brown spot at anterior margin. Hairs and bristles on thorax black; six strong dc, 12 irregularly paired acr short and hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one yellow bristle on lower portion.

Legs mainly yellow; fore tarsomeres 3-5 and mid and hind tarsomeres 2-5 dark brown. Hairs and bristles on legs black except hairs on fore coxa yellow. Fore coxa with four thick dark brownish yellow bristles on antero-apical portion; mid coxa with three or four partly brownish yellow or black anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Mid and hind trochanters each with one outer bristle at middle. Fore tibia devoid of bristles. Mid tibia with two ad, two pd, row of short dense crochet-like av hairs, and two apical bristles. Hind tibia much elongated, 1.7 × longer than fore tibia, with three ad, three pd, seven short thin pv, two thick apical bristles, and short blackish comb-like apical bristles on very short plate-like process. Fore tarsomeres 4 and 5 with slightly long hairs. Mid tarsus with row of short dense crochet-like av hairs; tarsomere 1 with two short ad, one long pd at extreme base, five av, and three apical bristles. Hind tarsomere 1 with pale-colored semi-fan-shaped ventral ridge bearing three short and three long hairs at extreme base, three av, and four apical bristles. Relative lengths of tibiae and five tarsomeres of legs - LI 6.8: 4.9: 3.2: 2.9: 2.1: 0.8; LII 8.2: 8.2: 3.5: 2.2:1.2: 0.7; LIII 11.5: 4.7: 4.1: 2.4: 1.3: 0.9.

Wing nearly hyaline, tinged brown; veins brown, M1+2 gently bent apically and convergent with R4+5; CuAx ratio 0.16. Squama yellow but brown at margin, with yellow hairs. Halter dark yellow, with cluster of hairs at base of knob.

Abdomen yellow with pale yellow pollen; terga 2-5 each with dark brown antero-laterally; hypopygium shiny dark brown. Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 3B ): epandrium nearly as long as wide, with two lateral processes (one long, somewhat thick, apically with two short or long and thin processes, and one denticle at apical 1/6; the other very long and thin. Ventral surstylus rather large and broad, ~ 1.5 × wider than dorsal surstylus, apically with four long hairs; dorsal surstylus short and broad, apically folded with an oblique finger-like process. Cercus basally somewhat round, white, bearing short white hairs, apically long finger-like. Hypandrium quite long and thin, apically acute. Phallus rather long and thin, apically acute, hidden within hypandrium.

Female. Body length 4-5.2 mm, wing length 3.8-4.2 mm. Similar to male, except the following features: eyes distinctly separated on face, narrowest distance in middle of face equal to distance between ocellar bristles; postnotum with a nearly U-shaped dark brown spot. Relative lengths of tibiae and five tarsomeres of legs - LI 4.2: 3.3: 2.1: 1.7: 0.9: 0.6; LII 5.2: 2.8: 2.0: 1.2: 0.7: 0.5; LIII 8.0: 3.1: 2.6: 1.5: 1.0: 0.6.

Distribution.

China (Yunnan).

Etymology.

The specific name refers to the dorsal surstylus with a short finger-like process apically.

Remarks.

The species is very similar to N. centralis Yang & Saigusa from Yunnan, but may be separated from the latter by the postnotum yellow with a nearly W-shaped dark brown spot and the mid tibia and tarsus with row of short dense crochet-like av hairs. In N. centralis , the postnotum is wholly blackish, and the mid tibia and tarsus do not have the crochet-like av hairs except the mid tarsomere 1 with row of erect av hairs ( Yang and Saigusa 2001b; Yang et al. 2011).

Figures

Figure 3. Neurigona brevidigitata sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Figure 8. Antennae A Neurigona apicilata sp. nov. B Neurigona basicurva sp. nov. C Neurigona brevidigitata sp. nov. D Neurigona convexa sp. nov. E Neurigona huanglianshana sp. nov. F Neurigona quadrimaculata sp. nov. G Neurigona ventriprocessa sp. nov. Scale bars: 0.1 mm.