Stenus tuyueyei , Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016
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Taxon classification Animalia Coleoptera Staphylinidae
Stenus tuyueyei sp. n. Figs 11, 68-71
Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan, Mianning Co., Yele, Daba, 26°55'22"N, 102°13'32"E, mixed leaf litter, sifted, 2500 m, 25.VI.2015, Jiang, Peng, Tu & Zhou leg." "Holotype / Stenus tuyueyei / Tang, Liu & Niu" [red handwritten label] (SHNU).
Brachypterous; body blackish with pronotum and elytra somewhat lighter, antennae, maxillary palpi and legs reddish yellow, except antennal club infuscate.
BL: 3.8mm, FL: 1.8 mm.
HW: 0.73 mm, PL: 0.57 mm, PW: 0.57 mm, EL: 0.61 mm, EW: 0.64 mm, SL: 0.44 mm.
Head 1.14 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching the level of inner eye margins; punctures round, slightly larger on posterior areas of furrows than those on rest areas, diameter of large punctures about as wide as basal cross section of antennal segment II; interstices smooth, much narrower than half the diameter of punctures except those along the midline of the convex median portion, which may be as wide as diameter of punctures. Paraglossa coniform.
Pronotum as long as wide; disk uneven, with distinct median longitudinal furrow, two impressions in anterior half, transverse impression in the middle, and two impressions in posterior half; punctures more or less confluent, of similar size to those of head; interstices faintly reticulated, more or less narrower than half the diameter of punctures except those at the bottom of longitudinal furrow, which could be three times as wide as diameter of punctures.
Elytra 0.95 times as long as wide; disk relatively uneven with shallow longitudinal humeral impression, distinct postero-lateral impression and long sutural impression, suture moderately convex; punctation and interstices similar to those of pronotum.
Legs with tarsomeres IV deeply bilobed.
Abdomen cylindrical; distinct paratergites absent, rudimentary lateral border present only on anterior half of segment III, tergites and sternites totally fused in posterior half of segment III and entire segment IV–VI; posterior margin of tergite VII without membranous fringe; punctures mostly round, becoming slightly smaller posteriad; interstices smooth except those of last three tergites shallowly reticulated, larger to much larger than diameter of punctures except those on basal impressions of basal three abdominal tergites, which could be narrower than half the diameter of punctures.
Male. Sternite VIII (Fig. 68) with triangular emargination at middle of posterior margin; sternite IX (Fig. 69) with very long apicolateral projections, posterior margin with long and sharp median projection. Aedeagus (Figs 70, 71) robust; apical sclerotized area very wide and short with small and round tip; expulsion clasps large; parameres a little shorter than median lobe, slightly swollen in apical part, with 12 setae on apico-internal margins.
The new species can be readily separated from other related species by abdominal segment III fused on posterior half.
This species is named in honor of Mr. Yue-ye Tu who collected some specimens of the new species.
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