Stenus zhulilongi 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 : 2-3

Stenus zhulilongi Tang & Puthz , sp. nov.

( Figs. 1 , 7–11 )

Type material. Holotype: CHINA: Zhejiang Prov.: ɗ, Kaihua County, Mt. Gutian, 5–7.V.2005, ZHU Li- Long & LI Jin-Wen leg. ( SHNU). Paratypes: CHINA: Zhejiang Prov.: 6ΨΨ, same data as for the holotype (5ΨΨ in SHNU, 1Ψ in cPut).

Description. BL: 3.7–5.0 mm; FL: 2.0 mm.

Proportional measurements of holotype: HW: 40, PW: 30, PL: 33, EW: 37, EL: 37.5, SL: 26.

Brachypterous, blackish, moderately glossy, each elytron with large suboval orange spot; head coarsely and moderately densely punctate, pronotum and elytra coarsely and very densely, slightly rugosely punctate, abdomen coarsely and moderately densely (anteriorly) to finely and sparsely (posteriorly) punctate; pubescence long, especially conspicuous and erect on abdomen. Antennae yellowish red, club infuscate. Maxillary palpi reddish yellow. Legs reddish yellow. Clypeus black, labrum dark brown, moderately sparsely pubescent.

Head 1.08 times as wide as elytra; clypeofrontal area sparsely punctate and pubescent; basiantennal tubercles elongate; interocular area with deep longitudinal furrows, median portion slightly convex, distinctly extending 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 medial cross section of 2nd antennal segment, interstices between punctures smooth, a little smaller than half diameter of punctures. 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 9.0: 6.0: 14.5: 8.0: 7.0: 6.5: 5.5: 4.5: 5.0: 5.0: 7.0. Paraglossae oval.

Pronotum 1.10 times as long as wide, 0.81 times as wide as elytra, widest near middle and constricted at base; disk uneven, with distinct median longitudinal furrow which is about 2/3 the length of pronotum, two faint impressions in anterior half, two moderate distinct impressions in about middle and two moderate distinct impressions in posterior half; punctures round and slightly confluent, different in size, diameter of large punctures about as wide as medial cross section of 2nd antennal segment, interstices smooth, much smaller than half diameter of punctures.

Elytra slightly longer than wide, distinctly constricted at base, lateral margins gently divergent posteriad; posterior conjoint margins roundly and distinctly emarginate at middle; disk uneven with distinct humeral impression, distinct sutural impression and faint postero-lateral impression; punctures round to elliptic, slightly confluent, larger than those on pronotum, interstices smooth, much smaller than half diameter of punctures. Orange spot nearly half as long as and slightly broader than half of one elytron.

Legs elongate, hind tarsi 0.72 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 on 3–8th abdominal tergites 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. 7 ) with shallow emargination at middle of posterior margin; 9th sternite ( Fig. 8 ) with long apicolateral projections, posterior margin serrately emarginate. Aedeagus ( Fig. 9 ) with median lobe subparallel at base and tapering apicad at about basal 2/3, apical sclerotized area rounded at apex, expulsion clasp ( Fig. 10 ) large, strongly sclerotized; parameres slender and almost straight, much longer than median lobe, swollen at apex, each with about 8 setae on apico-internal margins.

Female. Abdomen broader than that in male; 8th sternite entire; strongly sclerotized spermatheca as in Fig. 11 .

Remarks. This new species is similar to S. lacrimulus L. Benick, 1942 described from Fujian Province, but may be distinguished by the coarser punctation of the frons and the shorter elytral spot. Stenus zhulilongi differs from S. ovalis Tang et al., 2005 , described from Zhejiang Province, in having more rugose punctation on pronotum and a larger body size. The closest species of S. zhulilongi is S. lijinweni described below: for differences between the two new species see remarks on S. lijinweni .

Distribution. China (Zhejiang Province).

Etymology. This species is named in honor of Mr. Zhu Li-Long, 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 7 – 11. Details of Stenus zhulilongi sp. nov. 7 — male 8 th sternite; 8 — male 9 th sternite; 9 — aedeagus in ventral view; 10 — expulsion clasp of aedeagus; 11 — spermatheca. Scale bars 0.25 mm.