Stenus jiajinshanus , Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016
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Taxon classification Animalia Coleoptera Staphylinidae
Stenus jiajinshanus sp. n. Figs 10, 63-67
Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Xiaojin County, Jiajin Shan, 30°48'49"N, 102°42'55"E, mixed leaf litter, sifted, 2490 m, 20.VII.2015, Jiang, Peng, Tu & Zhou leg." "Holotype / Stenus jiajinshanus / Tang, Liu & Niu" [red handwritten label] (SHNU). Paratypes. 1♂, same data as for the holotype (SHNU); 1 ♀, Xiaojin County, Jiajin Shan, Mahuanggou, 30°51'20"N, 102°45'49"E, 2630 m, 21.VII.2015, Jiang, Peng, Tu & Zhou leg. (SHNU)
Brachypterous; forebody yellowish brown except areas along the inner margins of eyes slightly darker, abdomen reddish brown. Antennae, maxillary palpi and legs reddish yellow, except antennal club infuscate.
BL: 3.1-3.2mm, FL: 1.5-1.6 mm.
HW: 0.65-0.68 mm, PL: 0.48-0.49 mm, PW: 0.49-0.50 mm, EL: 0.47-0.50 mm, EW: 0.55-0.59 mm, SL: 0.35-0.40 mm.
Head 1.15-1.19 times as wide as elytra, interocular area with two deep longitudinal furrows, median portion convex, distinctly extending beyond the level of inner eye margins; punctures round, mostly well delimited, slightly larger and sparser on median area than those near inner margins of eyes, diameter of large punctures about as wide as apical 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 0.98 times 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 slightly confluent, of similar size to those of head; interstices smooth, more or less narrower than half the diameter of punctures except those at the bottom of longitudinal furrow, which could be larger.
Elytra 0.85-0.86 times as long as wide; disk moderately uneven with shallow longitudinal humeral impression, distinct postero-lateral impression and long sutural impression, suture moderately convex; punctures more or less longitudinally confluent, slightly larger than those of pronotum; interstices smooth, distinctly narrower than half the diameter of punctures.
Legs with tarsomeres IV deeply bilobed.
Abdomen cylindrical; line-like paratergites present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membranous fringe; punctures of abdominal tergites III–VIII round to elliptic, gradually becoming smaller posteriad; interstices smooth except those of last two tergites shallowly reticulated, narrower than half the diameter of punctures.
Male. Sternite VIII (Fig. 63) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 64) with very long apicolateral projections. Aedeagus (Figs 66, 67) slender, apical sclerotized area subtriangular with round tip; expulsion clasps large; parameres distinctly shorter than median lobe, slightly swollen in apical part, with 9-10 setae on apico-internal margins.
Female. Sternite VIII entire; spermatheca (Fig. 65) with basal duct strongly sclerotized, remining part of the duct weakly sclerotized and very coiled.
To distinguish the new species from other species with small body length, see characters listed in key.
The specific name is derived from the type locality of this species.
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