Systenus apicidigitatus, Lin & Zhang & Yang, 2023
publication ID |
https://doi.org/ 10.11646/zootaxa.5383.2.3 |
publication LSID |
lsid:zoobank.org:pub:1D2AD0FF-CE98-462C-A238-CC3DBF2906C9 |
DOI |
https://doi.org/10.5281/zenodo.10350929 |
persistent identifier |
https://treatment.plazi.org/id/03F03213-FFAF-1964-9AD6-FA0A64D240AD |
treatment provided by |
Plazi |
scientific name |
Systenus apicidigitatus |
status |
sp. nov. |
1. Systenus apicidigitatus sp. nov.
( Figs 1 View FIGURES 1–6. 1 , 7–8 View FIGURES 7–8 )
Diagnosis. Antennal scape and pedicel dark brownish yellow. Postpedicel 4.0 times longer than wide. All coxae yellow, but mid coxa basally brown. R 4+5 and M 1 strongly convergent apically. Surstylus basally rather thick, apically long thin and finger-like. Male cercus strongly bent, basally very thick, apically with short thin ventral process.
Description. Male ( Fig. 1 View FIGURES 1–6. 1 ). Body length 2.67–3.33 mm, wing length 2.33–3.0 mm.
Head metallic green with pale gray pollinosity. Frons metallic green with white gray pollinosity; face dark metallic green with thick silvery white pollinosity, narrower than postpedicel. Hairs and bristles on head black except lower postocular bristles yellowish. 2 oc, 2 vt, 2 pvt. Antenna black, but scape and pedicel dark brownish yellow; postpedicel 4.0 times longer than wide, nearly rectangular at basal 1/3, very long and thin at remaining 2/3, and with dark brown pubescence; arista 0.38 times as long as postpedicel, apical, with very short dark brown pubescence ( Fig. 7 View FIGURES 7–8 ). Proboscis short, brown to dark brown with brown hairs; palpus small, dark brownish yellow with short black hairs and 1 black long strong apical bristle.
Thorax metallic green with pale gray pollinosity. Hairs and bristles on thorax black; 6 dc; 9–10 irregular pairs of short 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 mainly yellow; all coxae yellow, but mid coxa basally brown; all tarsomere 5 dark brown. Hairs and bristles on legs black, but those on coxae yellow. Fore leg without distinct bristles. Hind coxa with 1 brown outer bristle at base. Mid tibia with 1 ad, 2 pd and 3 apical bristles. Hind tibia with 4 short pd and 2 apical bristles. Mid tarsomeres 1–4 each with 1 ad at middle and 4 apical bristles. Relative length of tibiae and five tarsomeres of legs LI 3.0: 1.6: 1.0: 0.7: 0.5: 0.4; LII 4.3: 2.0: 1.5: 1.0: 0.7: 0.6; LIII 4.9: 0.9: 2.1: 0.7: 0.5: 0.8.
Wing hyaline, somewhat brownish; veins dark brown, R 4+5 and M 1 strongly convergent apically; CuAx ratio 0.6. Squama yellow with long black hairs; halter pale yellow.
Abdomen dark metallic green with pale gray pollinosity, venter yellowish. Hairs and bristles on abdomen black. Terga 1–4 with long bristles at apical margin.
Male genitalia ( Fig. 8 View FIGURES 7–8 ): epandrium distinctly longer than wide; epandrial lobe rather narrow, apically hook-like; surstylus basally rather thick, apically long finger-like. Cercus strongly bent, basally very thick, apically narrowed with short thin ventral process. Hypandrium very long, apically long finger-like. Phallus long, somewhat thickened, distinctly curved inward.
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) GoogleMaps . PARATYPES: 5 ♂, same data as holotype ( CAU) GoogleMaps ; 3 ♂, same data as holotype except, 2019.III.19–IV.19 ( CAU) GoogleMaps .
Distribution. China (Yunnan).
Remarks. Systenus apicidigitatus sp. nov. is very similar to S. huanglianus sp. nov., but may be separated from the latter by the following features: antennal two basal segments dark brownish yellow; R 4+5 and M 1 strongly convergent apically; postpedicel 3.5 times longer than wide.
Etymology. The specific name refers to the surstylus apically finger-like.
CAU |
China Agricultural University |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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