Systenus digitatus, 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.10350935 |
persistent identifier |
https://treatment.plazi.org/id/03F03213-FFAB-1960-9AD6-FD4263834249 |
treatment provided by |
Plazi |
scientific name |
Systenus digitatus |
status |
sp. nov. |
3. Systenus digitatus sp. nov.
( Figs 3 View FIGURES 1–6. 1 , 11–12 View FIGURES 11–12 )
Diagnosis. Postpedicel rather long, 3.0 times longer than wide, basally rather thick, apically finger-like; arista 0.65 times as long as postpedicel. All coxae yellow. Epandrial lobe short wide with six finger-like processes. Surstylus rather wide with narrow and slightly curved tip.
Description. Male ( Fig. 3 View FIGURES 1–6. 1 ). Body length 2.5 mm, wing length 2.0 mm.
Head metallic green with pale gray pollinosity. Frons metallic green with white gray pollinosity; face dark metallic green with dense silvery white pollinosity, narrower than width of postpedicel. Hairs and bristles on head black, but lower postocular bristles yellowish. 2 oc, 2 vt, 2 pvt. Antenna blackish; pedicel with blackish apical bristles; postpedicel rather long, 3.0 times longer than wide, basally rather thick, apically long finger-like, and with dense dark brown pubescence; arista apical, brown, 0.65 times as long as postpedicel, with very short dark brown pubescence ( Fig. 11 View FIGURES 11–12 ). Proboscis short, brownish with brownish yellow hairs; palpus small, dark brown, with black hairs and 1 black apical bristle.
Thorax metallic green with pale gray pollinosity, but pleura blackish to black. Hairs and bristles on thorax black; 5 dc; 5 to 6 irregular pairs of acr; 2 strong npl, 1 strong sa, 1 strong pa; sc long and strong, lsc short and hair-like.
Legs mainly yellow to dark yellow; all coxae yellow; all tarsi brownish yellow with tarsomere 5 brownish. Hairs and bristles on legs black except those on coxae dark yellow and hind coxa with 1 brown strong outer bristle at middle. Hind trochanter with 1 blackish bristle. Mid tibia with 1 ad, 1 pd, 1 av, and 3 apical bristles; hind tibia with 2 ad and 2 apical bristles. Mid tarsomere 1 with 5 pv, tarsomere 2 with 3 pd and 2 apical bristles. Relative length of tibiae and five tarsomeres of legs LI 2.1: 1.0: 0.9: 0.6: 0.5: 0.5; LII 3.0: 1.5: 1.1: 0.8: 0.5: 0.4; LIII 3.5: 0.8: 1.5: 0.8: 0.6: 0.4.
Wing hyaline, weakly tinged brownish; veins dark brown; M 1 bent medially; R 4+5 and M 1 widened at first, then convergent apically; CuAx ratio 0.6. Squama yellow with blackish hairs. Halter pale yellow.
Abdomen dark metallic green with pale gray pollinosity, venter brownish yellow. Hairs and bristles on abdomen black. First tergum with very long black bristles at posterior margin.
Male genitalia ( Fig. 12 View FIGURES 11–12 ): epandrium distinctly longer than wide; epandrial lobe basally short wide with six finger-like processes, apically long spine-like; surstylus rather wide with narrow and slightly curved tip. Cercus basally rather wide, apically finger-like. Hypandrium long finger-like. Phallus 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) GoogleMaps . PARATYPES: 5 ♂, same data as holotype ( CAU) GoogleMaps .
Distribution. China (Yunnan).
Remarks. Systenus digitatus sp. nov. is somewhat similar to S. basiflavus sp. nov. in having the postpedicel distinctly elongated and surstylus elongated with a small dorsal process near base, but can be easily separated from the latter by the following features: antenna wholly blackish; surstylus nearly straight with a very short dorsal process directed forward; cercus not furcated apically.
Etymology. The specific name refers to the epandrial lobe with six finger-like processes.
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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