Systenus latimaculatus Lin & Zhang & Yang 2023, sp. nov.
Creators: name: Lin, Chen
name: Zhang, Chunmin
name: Yang, Ding
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Dolichopodidae
Systenus
Systenus latimaculatus

description: 7. Systenus latimaculatus sp. nov.
(Figs 6, 17–18)
Diagnosis. Postpedicel 3.2 times longer than wide. Wing with wide grayish brown apical band. R 4+5 and M 1 parallel apically. Fore coxa yellow, mid and hind coxae dark brown. Hind femur narrowly brown near extreme tip. Mid tibia brown at narrow tip, hind tibia dark brown at apical 1/3. Abdominal segment 7 petiolate. Surstylus large and broad, apically distinctly widened, and with a long finger-like dorsal process directed inward.
Description. Male (Fig. 6). Body length 3.25 mm, wing length 3.13 mm.
Head metallic green with pale gray pollinosity. Frons metallic green with white gray pollinosity; face dark metallic green with dense silvery white pollinosity, slightly wider than width of postpedicel. Hairs and bristles on head black, but lower postocular bristles yellowish. 2 oc, 2 vt, 2 pvt. Antenna [apical segment of arista broken] black; pedicel with blackish apical bristles; postpedicel 3.2 times longer than wide, basally rather thick, apically long finger-like, and with dense dark brown pubescence; arista apical (Fig. 17). Proboscis short, dark brown with short blackish hairs; palpus small, blackish, with black hairs and 1 slightly long black apical bristle.
Thorax metallic green with pale gray pollinosity. Hairs and bristles on thorax black; 6 dc, 13–14 irregularly paired acr; 2 strong npl, 1 strong sa, 2 strong pa; sc long and strong, lsc short and hair-like. Propleuron with 1 brown bristle on lower portion.
Legs [mid and hind tarsi broken] mainly yellow; fore coxa yellow, mid and hind coxae dark brown; hind femur narrowly brown near extreme tip; mid tibia brown at narrow tip, hind tibia dark brown at apical 1/3; fore tarsomere 5 brown. Hairs and bristles on legs black except those on coxae yellow. Mid tibia with 1 ad. Relative length of tibiae and five tarsomeres of legs LI: 4.2: 1.9: 1.7: 1.0: 0.6: 0.4; LII: 5.7: distal podomeres missing; LIII: 6.9: distal podomeres missing.
Wing nearly hyaline with wide grayish brown apical band; veins dark brown, R 4+5 and M 1 distinctly separated and parallel apically; CuAx ratio 0.5. Squama yellow, with fan of pale white hairs. Halter pale yellow.
Abdomen dark metallic green with pale gray pollinosity. Hairs and bristles on abdomen black. Abdominal segment 7 petiolate.
Male genitalia (Fig. 18): epandrium distinctly longer than wide; epandrial lobe basally thick, distinctly narrowed toward tip, short hook-like at extreme tip; surstylus large and broad, apically distinctly widened with nearly truncate apical margin, and with long finger-like dorsal process directed inward. Cercus basally rather wide, apically finger-like. Hypandrium long spine-like, slightly curved. Pallus long and thin.
Female. Unknown.
Type material. HOLOTYPE ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang [23°3’25.2”N, 102°46’37.71”E, 1779 m], collected by Malaise trap, 2019.IV.19–V.19, Liang Wang and Xin Li (CAU).
Distribution. China (Yunnan).
Remarks. Systenus latimaculatus sp. nov. is peculiar and can be easily separated from other Asian known species of the genus by the following features: pregenital segments petiolate; wing with wide grayish brown apical band; R 4+5 and M 1 parallel apically (Olejnícek and Kozánek, 1997; Lin & Yang, 2022).
Etymology. The specific name refers to the wide apical spot of the wing.
description: Published as part of Lin, Chen, Zhang, Chunmin & Yang, Ding, 2023, The genus Systenus Meigen, 1803 (Diptera: Dolichopodidae) from Yunnan, China, with descriptions of six new species, pp. 153-166 in Zootaxa 5383 (2) on page 163, DOI: 10.11646/zootaxa.5383.2.3, http://zenodo.org/record/10350971