Stenus daicongchaoi , Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016
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Taxon classification Animalia Coleoptera Staphylinidae
Stenus daicongchaoi sp. n. Figs 4, 30-35
Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan Prov., Emeishan Mt., Jieyin Palace, 0.7 km, 29°32'N, 103°20'E, alt. 2500-2600 m, 18.VII.2012, Peng, Dai & Yin leg. ”“ Holotype / Stenus daicongchaoi / Tang Liu & Niu" [red handwritten label] (SHNU). Paratypes. 2♂♂2♀♀, same data as for the holotype (1 pair in cPut, rest in SHNU); 2♀♀, Emei Shan, Xixiangchi, 29°33'N, 103°20'E, alt. 2100-2300 m, 21.VII.2012, Peng, Dai & Yin leg. (SHNU); 1 ♂1♀, Emeishan Mt., Jinding, 29°31'N, 103°20'E, alt. 3000 m, 20.VII.2012, Peng, Dai & Yin leg. (SHNU); 1♀, Emeishan, 29°32'48.4"N, 103°20'06.3"E, 2342 m, 17.VII.2010, sifting, V. Grebennikov leg. ( CNC);
Brachypterous; body brownish except head with interocular area somewhat darker and elytra lighter, each elytron with slender spot, which is about 1/2 as long as and 1/3 as broad as the respective elytron, sometimes they are inconspicuous. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate.
BL: 4.7-5.0mm, FL: 2.2-2.4 mm.
HW: 0.87-0.89 mm, PL: 0.70-0.74 mm, PW: 0.67-0.69 mm, EL: 0.79-0.82 mm, EW: 0.81-0.83 mm, SL: 0.58-0.62 mm.
Head 1.06-1.08 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching the level of inner eye margins; punctures round, partly confluent, 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 twice as wide as the diameter of punctures. Paraglossa coniform.
Pronotum 1.04-1.07 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 more or less confluent, of similar size to those of head; interstices partially and indistinctly reticulated, more or less narrower than half the diameter of punctures except those at the bottom of longitudinal furrow, which could be larger.
Elytra 0.98-0.99 times as long as wide; disk uneven with longitudinal humeral impression, postero-lateral impression and deep sutural impression, suture moderately convex; punctation longitudinally confluent; interstices smooth and ridge-like.
Legs with tarsomeres IV deeply bilobed.
Abdomen cylindrical; paratergites very narrow and punctate, present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membranous fringe; punctures round, becoming slightly smaller posteriad; interstices smooth except those of last two tergites shallowly reticulated, narrower than half the diameter of punctures on tergite III–VI.
Male. Sternite VII (Fig. 30) impressed at posteromedian part with emargination along posterior margin of impression; sternite VIII (Fig. 31) with triangular emargination at middle of posterior margin; sternite IX (Fig. 32) with very long apicolateral projections, posterior margin with distinct median projection. Aedeagus (Figs 34, 35) broadest at about basal 2/5 and gradually tapering apicad, apical sclerotized area with a long apical cuspidate projection; expulsion clasps large; parameres a little shorter than median lobe, swollen at apical parts, each with 9-11 setae on apico-internal margins.
Female. Sternite VIII entire; spermatheca (Fig. 33) weekly sclerotized except the basal porch and basal duct well sclerotized.
The species is similar to Stenus bostrychus , but can be distinguished from the latter by less confluent punctation of pronotum and relatively larger punctures of abdomen.
This species is named in honor of Mr. Cong-Chao Dai who collected some specimens of the new species.
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