Stenus zhejiangensis Tang, Liu & Zhao, 2017

Zhao, Tie-Xiong, 2017, A study on the genus Stenus Latreille from Zhuji City of Zhejiang, East China (Coleoptera, Staphylinidae), Zootaxa 4323 (1), pp. 25-38 : 31

Stenus zhejiangensis Tang, Liu & Zhao , new species

( Figs. 3 , 13 –16)

Type material. Holotype. China: Zhejiang: Zhuji: ♂, glued on a card with labels as follows: “ China: Zhejiang Province, Zhuji City, Dongbaishan , mixed leaf litter, sifted, alt. 300m, 31.III.2013, Tie-Xiong Zhao leg.” “ Holotype / Stenus zhejiangensis / Tang, Zhao & Luo ” [red handwritten label] ( SHNU) .

Description. Body blackish with clypeus and labrum dark reddish brown. Antennae reddish brown with club infuscate, maxillary palpi and legs reddish brown.

BL: 3.8 mm, FL: 2.2 mm. HW: 0.75 mm, PL: 0.63 mm, PW: 0.59 mm, EL: 0.83 mm, EW: 0.83 mm, SL: 0.64 mm.

Head 0.93 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, extending a little beneath the level of inner eye margins; punctures round to elliptic, mostly well delimited, similar in size, diameter of punctures as wide as apical cross section of antennal segment II; interstices partially reticulated, distinctly narrower than half the diameter of punctures. Paraglossa oval.

Pronotum 1.06 times as long as wide; disk slightly uneven, with shallow median longitudinal furrow; punctures slightly confluent, different in size, large punctures similar to those of head; interstices partially reticulated, narrower than half the diameter of punctures.

Elytra as long as wide; disk relatively even with shallow humeral impression and shallow sutural impression; punctures mostly similar in size and slightly larger than the large punctures of pronotum, interstices mostly shallowly reticulated.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; segment III with paratergites very narrow and punctate, directed ventrad, segments IV– VI with tergites and sternites fused with suture very indistinct, tergite VII with apical membranous fringe; punctures round to elliptic, becoming slightly smaller posteriad; interstices reticulated, mostly narrower than half the diameter of punctures on tergite III–V.

Male. Sternite VII with posteriomedian portion flattened and posterior margin slightly emarginated at middle; sternite VIII ( Fig. 14 ) with very shallow emargination at middle of posterior margin; sternite IX ( Fig. 13 ) with long apicolateral projections, posterior margin serrate and roundly emarginated. Aedeagus ( Figs. 15 , 16) slender; apical sclerotized area with a round apical projection at middle; expulsion clasps large, strongly sclerotized; parameres much longer than median lobe, tapering apicad at about half, each with 5 subapical setae and 8 basal setae on apico-internal margins.

Female. Unknown.

Distribution. China (Zhejiang).

Remarks. The species belongs to Stenus cephalotes group and it is the first species of the group with fully developed hind wings.

Etymology. The specific name is derived from the type locality of this species.

Figures

FIGURES 3 – 7. Stenus dongbaishanus 3 male sternite IX 4 male sternite VIII 5, 6 aedeagus 7 valvifers and spermatheca. Scale bars = 0.25 mm.

FIGURES 12 – 15. 12 Stenus alumoenus 13, 14 S. gastralis 15 S. kuatunensis 1 2, 13 15 aedeagus 14 apical portion of aedeagus in lateral view. Scale bars = 0.25 mm.