Stenus lijinweni Tang & Puthz

Liang, Tang, Zhao, Yun-Long & Puthz, Volker, 2008, Six new Stenus species of the cirrus group (Coleoptera, Staphylinidae) from China with a key to species of the group, Zootaxa 1745, pp. 1-18 : 5-7

Stenus lijinweni Tang & Puthz , sp. nov.

( Figs. 2 , 12–15 )

Type material. Holotype: CHINA: Jiangxi Prov.: ɗ, Shangrao City, Mt. Sanqing, alt. 800 m, 4.V.2005, HU Jia-Yao & TANG Liang leg.( SHNU). Paratypes: CHINA: Jiangxi Prov.: ɗ, Ψ, same data as for the holotype ( SHNU); Zhejiang Prov.: ɗ, 2ΨΨ, Kaihua County, Mt. Gutian, 5–7.V.2005, ZHU Li-Long & LI Jin-Wen leg. (2ΨΨ in SHNU, 1ɗ in cPut).

Description. BL: 3.8–5.0 mm; FL: 2.0 mm.

Proportional measurements of holotype: HW: 38.5, PW: 28, PL: 29.5, EW: 34, EL: 33.5, SL: 23.5.

Brachypterous, black with some brownish tint, glossy, each elytron with large oval orange spot; forebody very coarsely and densely punctate, abdomen coarsely and moderately sparsely (anteriorly) to finely and very sparsely (posteriorly) punctate; pubescence long, especially erect on abdomen. Antennae reddish yellow, club infuscate. Maxillary palpi reddish yellow. Legs reddish yellow. Clypeus black, labrum dark brown, moderately densely pubescent.

Head 1.13 times as wide as elytra; clypeofrontal area densely punctate and pubescent; basiantennal tubercles small; interocular area with moderate longitudinal furrows, median portion convex, extending a little beneath the level of inner eye margins; punctures round, 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 2nd antennal segment, interstices between punctures smooth, mostly smaller than half diameter of punctures, interstices along midline and posteriorly near inner eye margins a little larger. Antennae when reflexed slightly extending beyond posterior margin of pronotum; 3rd to 8th segments much narrower than 2nd; 9th to 11th gradually broadened, forming loose club; relative length of segments from base to apex as 8.0: 5.0: 13.0: 7.5: 6.5: 5.0: 5.0: 3.5: 3.5: 4.5: 5.5. Paraglossae oval.

Pronotum 1.05 times as long as wide, 0.82 times as wide as elytra, widest near middle and constricted at base; disk uneven, with shallow median longitudinal furrow which is about 2/3 the length of pronotum, a transverse impression in anterior half, two impressions in about middle and two impressions in posterior half; punctures round, some of them confluent, different in size, diameter of large punctures about as wide as apical cross section of 2nd antennal segment, interstices smooth, distinctly smaller than half diameter of punctures.

Elytra nearly as long as wide, distinctly constricted at base, lateral margins gently divergent posteriad; posterior conjoint margins roundly and distinctly emarginate at the middle; disk uneven with faint humeral impression and faint sutural impression; punctures round to elliptic, different in size, diameter of large punctures about as wide as apical cross section of 1st antennal segment, interstices smooth, much smaller than half diameter of punctures. Lateral elytral spot long, about two fifth as long as and nearly half as broad as one elytron.

Legs elongate, hind tarsi 0.73 times as long as hind tibiae, 4th tarsomeres strongly bilobed.

Abdomen cylindrical; paratergites very narrow and smooth, present only in 3rd segment, tergite 7 without apical membranous fringe; punctures round to elliptic, gradually becoming smaller posteriad, each puncture with long and suberect seta, interstices smooth, varied from smaller to larger than diameter of punctures.

Male. Eighth sternite ( Fig. 12 ) with distinct emargination at middle of posterior margin; 9th sternite ( Fig. 13 ) with long apicolateral projections, posterior margin serrately emarginated. Aedeagus ( Fig. 14 ) with median lobe broadest at about basal 1/3, tapering apicad, apical sclerotized area rounded at apex, expulsion clasp ( Fig. 15 ) large, strongly sclerotized; parameres almost straight, distinctly longer than median lobe, each with 3 groups of subapical setae (4-3-2).

Female. Abdomen broader than that in male; 8th sternite entire. (An illustration of the spermatheca is not given here, as it would be inaccurate based on immature females.)

Remarks. This new species is very similar to (and in part sympatric with) S. zhulilongi , but may be distinguished by more regular punctation on pronotum, smaller elytral spot having about two “rows” of coarse punctures (in S. zhulilongi there are three “rows” of coarse punctures) and different sexual characters. Distribution. China (Jiangxi Province, Zhejiang Province).

Etymology. This species is named in honor of Mr. LI Jin-Wen, who collected some Stenus specimens used in this study and helped us in many other ways.

Figures

FIGURES 1 – 6. Stenus cirrus group, habitus. 1 — S. zhulilongi sp. nov., female; 2 — S. lijinweni sp. nov., male; 3 — S. jiulongshanus sp. nov., male; 4 — S. shenshanjiai sp. nov., male; 5, S. — flammeus sp. nov., male; 6 — S. bostrychus sp. nov., male. Scale bars 1 mm.

FIGURES 12 – 15. Details of Stenus lijinweni sp. nov. 12 — male 8 th sternite; 13 — male 9 th sternite; 14 — aedeagus in ventral view; 15 — expulsion clasp of aedeagus. Scale bars 0.25 mm.