Neurigona ventriprocessa, 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 ventriprocessa sp. nov.

Figs 7 , 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: 3 ♂♂, the same data as holotype (CAU).

Diagnosis.

Frons and face yellow. First flagellomere somewhat quadrate. Mesonotum brownish to brown, but notopleuron somewhat pale; scutellum brown with dark yellow apical margin; postnotum brown with blackish middle line. Fore tarsomere 3 shortened and tarsomere 4 ventrally weakly concave with mammillary ventral process at extreme base. Ventral surstylus distinctly longer than dorsal surstylus, distinctly widened at middle, apically narrowed with short finger-like ventral process; dorsal surstylus short, much widened, ~ 1.5 × wider than ventral surstylus.

Description.

Male (Fig. 7A ). Body length 6.9 mm, wing length 5.2 mm.

Head metallic green with gray pollinosity, but yellow ventrally; eyes very narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8G ) pale yellow except first flagellomere brown; first flagellomere somewhat quadrate, 1.1 × longer than wide, with slightly long, dense brownish pubescence; arista dorsal, dark brown. Proboscis mostly dark yellow, partly brown, with dark yellow and brown hairs; palpus dark yellow, but brown at base, with dark yellow hairs and two short brown bristles.

Thorax mostly dark yellow to brownish yellow with fine pale yellow pollinosity; mesonotum brownish to brown, but notopleuron somewhat pale; scutellum brown with dark yellow apical margin; postnotum brown with blackish middle line. Laterotergite with blackish stripe at anterior margin. Pteropleuron with a small black subtriangular spot. Hairs and bristles on thorax black, five strong dc, 14-15 irregularly acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but hind femur ventrally dark brown at basal 1/3; mid and hind tarsomeres 2-5 brown or dark brown. Hairs and bristles on legs mostly black except hairs on all coxae dark yellow. Fore coxa with dark yellow hairs and six mostly brownish yellow bristles on antero-apical portion; mid coxa with two short black bristles and eight dense dark yellow anterior and apical bristles; hind coxa with dark yellow hairs and one strong outer black bristle at basal 1/3. Mid and hind trochanters each with one outer bristle at middle. All femora distinctly thickened basally. Fore tibia with one short ad and two short pd. Mid tibia with two ad, three pd, one av, two pv, and three apical bristles. Hind tibia with three ad, three pd, two short or long apical bristles, and one row of yellow comb-like bristles. Fore tarsomere 3 shortened with short dense ventral hairs; tarsomere 4 somewhat whitened, ventrally weakly concave, somewhat bare at middle, extreme base distinctly dilated with mammillary ventral process, extreme tip weakly dilated with several short curly brown ventral hairs; tarsomere 5 with quite dense, curly and dark brown ventral hairs. Mid tarsomere 1 with several short or long bristles. Relative lengths of tibiae and five tarsomeres of legs LI - 6.8: 6.7: 2.9: 0.8:1.1: 1.0; LII 8.8: 9.1: 3.7: 2.4:1.3: 0.8; LIII 13.9: 4.9: 4.8: 2.6: 1.8: 0.9.

Wing nearly hyaline, tinged brown; veins dark brown, M1+2 strongly bent, geniculate nearly in a right angle; CuAx ratio 0.54. Squama dark yellow with brown margin bearing yellow hairs. Halter dark yellow with dark brown knob.

Abdomen yellow with pale yellow pollen; terga 1-4 each with large dark brown sport, tergum 5 wholly brown; sternum 5 weakly projected, small and subtriangular (Fig. 9D ). Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 7B ): epandrium nearly as long as wide, with two lateral processes (one short finger-like; the other slightly long and thick, finger-like). Ventral surstylus distinctly longer than dorsal surstylus, distinctly widened at middle, apically narrowed with short finger-like ventral process; dorsal surstylus short, much widened, ~ 1.5 × wider than ventral surstylus. Cercus long, with long dense yellow hairs. Hypandrium basally rather thick, apically narrowed. Phallus long and thin.

Female. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name refers to the fore tarsomere 4 with mammillary ventral process at extreme base.

Remarks.

The species is somewhat similar to N. guangxiensis Yang, 1999 and N. zhejiangensis Yang, 1999 from Oriental China in having the nearly quadrate first flagellomere, but may be separated from them by the mesonotum brownish to brown, fore tarsomere 3 shortened and tarsomere 4 ventrally weakly concave with mammillary ventral process at extreme base. In N. guangxiensis and N. zhejiangensis , the mesonotum is yellow with markings on the middle posterior portion, and the fore tarsus is not modified ( Yang et al. 2011).

Figures

Figure 7. Neurigona ventriprocessa 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.

Figure 9. Abdominal sternite 5 (male) A Neurigona basicurva sp. nov. B Neurigona convexa sp. nov. C Neurigona huanglianshana sp. nov. D Neurigona ventriprocessa sp. nov.