Neurigona basicurva, 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 basicurva sp. nov.

Figs 2 , 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: 2 ♂♂, the same data as holotype (CAU).

Diagnosis.

Mesonotum with three brown longitudinal stripes at middle posterior region. Abdominal sternite 5 quadrate. Fore tibia basally weakly thickened and bent. Ventral surstylus wide, distinctly bent with distinctly bent and narrowed tip; dorsal surstylus short and broad, folded inward, apically furcated.

Description.

Male (Fig. 2A ). Body length 3.8 mm, wing length 3.2 mm.

Head metallic green with pale yellow pollinosity; eyes narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antennal scape and pedicel (Fig. 8B ) yellow; first flagellomere dark yellow, almost as long as wide, round apically, with pale brown pubescence; arista subapical, brown, basal segment 0.1 × longer than apical segment. Proboscis yellow with pale hairs; palpus pale yellow with two black apical bristles.

Thorax yellow with fine pale yellow pollinosity; mesonotum dark yellow with three brown longitudinal stripes at middle posterior region; scutellum brownish; postnotum brownish with dark yellow basal margin; laterotergite with a small black inner spot at anterior margin. Pteropleuron below wing base with a small black spot. Hairs and bristles on thorax black, six strong dc, 11-12 irregularly paired acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like.

Legs mainly yellow, but fore tarsus dark brown, mid and hind tarsi pale brown. Hairs and bristles on legs black. Fore coxa with six mostly yellow bristles on antero-apical portion; mid coxa with three anterior and apical bristles; hind coxa with one strong outer bristle at basal 1/3. Mid trochanter with two bristles, hind trochanter with one bristle. Fore femur with two rows of short dense av. Fore tibia modified, basally weakly thickened and bent, with two rows of long dense black anterior bristles at basal 1/3 and two rows of short dense brownish yellow anterior hairs at remaining 2/3. Mid tibia with one outer bristle and one pd, apically with one bristle. Hind tibia with one pd, apically with three bristles and one row of pale brown comb-like bristles apically. Fore tarsomere 1 modified, weakly bent, with short dense and erect pv; tarsomeres 2-4 with fine but dense ventral hairs. Mid tarsomere 1 with one pv at extreme base. Hind tarsomere 1 with cluster of short erect bristles basally. Relative lengths of tibiae and five tarsomeres of legs - LI 6.7: 5.9: 2.8: 1.8: 1.2: 1.0; LII 7.5: 8.8: 3.0: 2.0: 1.1: 0.8; LIII 12.1: 4.0: 4.0: 2.1: 1.3: 0.7.

Wing nearly hyaline, tinged brown; veins brown, M1+2 gently bent apically and convergent with R4+5; CuAx ratio 0.45. Squama yellow, but brown at margin, with yellow hairs. Halter dark pale yellow.

Abdomen yellow with pale yellow pollen; terga 1-4 each with large dark brown spot; sternum 5 projected, quadrate (Fig. 9A ). Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 2B ): epandrium longer than wide, with two lateral processes (one very long and narrow; the other thick, with finger-like outer process near base, apically somewhat bent, and with one yellow bristle at apical 1/4). Ventral surstylus wide, distinctly bent with distinctly bent and narrowed tip; dorsal surstylus short and broad, folded inward, apically furcated. Cercus relatively small, trapezoid, white, with short pale yellow hairs. Hypandrium long and somewhat thick. Phallus long and thin, subapically with a denticle.

Female. Unknown.

Distribution.

China (Yunnan).

Etymology.

The specific name refers to the fore tibia basally weakly thickened and bent.

Remarks.

The species is peculiar and can be easily separated from other known species of the genus by the quadrate 5th abdominal sternite and fore tibia basally weakly thickened and bent.

Figures

Figure 2. Neurigona basicurva 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.