Stenus gonggashanus Tang & Puthz

Tang, Liang, Li, Li-Zhen & Puthz, Volker, 2010, Five new Stenus species of the cephalotes group (Coleoptera, Staphylinidae) from China with a key to Chinese species of the group, Zootaxa 2335, pp. 29-39 : 34-35

Stenus gonggashanus Tang & Puthz , sp. nov.

( Figs.3 , 16–20 )

Type material. Holotype: CHINA: Sichuan Prov.: 3, Luding County, Hailuogou, alt. 1900–2000 m, 26.VII.2006, HU Jia-Yao & TANG Liang leg. ( SHNU). Paratypes: CHINA: Sichuan Prov.: 43, 8ƤƤ, same data as for the holotype ( SHNU); 163, 12ƤƤ, same data but alt. 2200–2300 m, 27–28.VII.2006, HU Jia-Yao & TANG Liang leg. ( SHNU); 303, 33ƤƤ, same data but alt. 2800–3000 m, 21–25.VII.2006, HU Jia-Yao & TANG Liang leg. ( SHNU); 23, 2ƤƤ, Gongga Shan, above Camp 3, 3050 m, 22.VII.1994, A. Smetana leg. (C 18) (cSme, cPut); 3, Ƥ, Gongga Shan, Lake above Camp 2, 2750 m, 25.VII.1994, A, Smetana leg. (C 23) (cSme); 3, 2ƤƤ, same data but 27.VII.1994, A. Smetana leg. (C 27) (cSme, cPut); 3, 3ƤƤ, Gongga Shan, Hailuogou, above Camp 3, 3000 m, 29°35’N, 102°00’E, 6.VII.1996, A. Smetana, J. Farcać & P. Kabátek leg. (C 53) (cSme. cPuthz); 3, 2ƤƤ, Gongga Shan, Hailuogou, forest above Camp 2, 2800 m, 5.VII.1998, A. Smetana et al. leg. (C 75) (cSme); 23, Ƥ, Gongga Shan, Hailuogou, in front of Glacier 1, 2850 m, 7.VIII.1998, A. Smetana et al. leg. (C 76) (cSme, cPut); 73, Hailuogou glacier park, above Camp 1, 29°36’N, 102°04’E, 2100 m, 28–31.V.1997, A. Pütz leg. (cPüt, cPut); 83, 8ƤƤ, same data but 2000 m, 27–31.V.1997, M. Schülke leg. (13) (cSch); Ƥ, same data but Camp 2, 2500–2700 m, 30– 31.V.1997, D. Wrase leg. (cPut).

Description. BL: 2.7–3.1 mm; FL: 1.5–1.6 mm.

Proportional measurements of holotype: HW: 40.5, PL: 31.0, PW: 30.0, EL: 30.0, EW: 35.5, SL: 22.0.

Brachypterous, moderately glossy, head black, pronotum and elytra dark brown (some of the examined specimens with elytra distinctly lighter), abdomen blackish brown; head, pronotum and elytra coarsely and very densely punctate, abdomen moderately coarsely and densely (anteriorly) to finely and relatively sparsely (posteriorly) punctate; pubescence short, recumbent. Antennae reddish yellow, club infuscate. Maxillary palpi and legs reddish yellow. Clypeus blackish, labrum reddish brown with anterior margin lighter, densely pubescent.

Head 1.14 times as wide as elytra; clypeofrontal area densely punctate and pubescent; basiantennal tubercles small; interocular area with deep longitudinal furrows, median portion broad, broader than each of the side portions, strongly convex and very narrowly impunctate along midline, elevated distinctly above the level of inner eye margins; punctures round, slightly confluent and very crowded in the forepart, slightly larger and sparser on median area than near inner margins of eyes, diameter of large punctures about as wide as basal cross section of 2nd antennal segment, interstices densely reticulate, smaller than half diameter of punctures, interstices at top of median portion a little larger. Antennae when reflexed reaching posterior margin of pronotum; 3rd to 7th segments much narrower than 2nd; 8th to 11th gradually broadened, forming loose club; relative length of segments from base to apex as 6.5: 5.0: 7.5: 5.0: 4.5: 3.5: 3.0: 2.5: 3.0: 3.5: 5.5. Paraglossae oval.

Pronotum 1.03 times as long as wide, 0.85 times as wide as elytra, widest at a little before middle and constricted at base; disk uneven, with deep impunctate median longitudinal furrow, two shallow impressions in anterior half and two shallow impressions in posterior half; punctures round and moderately confluent, same size to largest punctures on head, interstices reticulated, much smaller than half diameter of punctures.

Elytra 0.85 times as long as wide, distinctly constricted at base, lateral margins gently divergent posteriad; posterior conjoint margins roundly and distinctly emarginate at middle; disk conspicuously uneven with distinct humeral impression, distinct postero-lateral impression and elevated suture; punctation round and confluent, a little larger than those on pronotum, interstices reticulated, smaller than half diameter of punctures.

Legs elongate, hind tarsi 0.69 times as long as hind tibiae, 4th tarsomeres distinctly bilobed.

Abdomen cylindrical; without paratergites; 7th tergite with apical narrow membranous fringe; punctures round to elliptic, gradually becoming smaller posteriad, interstices densely reticulate, varied from smaller than half to a little larger than one puncture diameter.

Male. Eighth sternite ( Fig. 16 ) with triangular emargination at middle of posterior margin; 9th sternite ( Fig. 17 ) with very long apicolateral projections, posterior margin relatively smooth and roundly emarginated. Aedeagus ( Fig. 18 ) with median lobe broadest at about middle and gradually narrowed apicad into an acuate sclerotized apex; expulsion hooks ( Fig. 19 ) large, internal sac as in Fig. 18 ; parameres extending beyond the apex of median lobe, slightly swollen in their apical portion, on their inner side each with two groups of subapical setae (5 in distal and 4 in basal).

Female. Abdomen broader than that in male; 8th sternite with posterior margin pointed at middle; sclerotized spermatheca with U-shaped infundibulum as in Fig. 20 .

Remarks. This new species resembles S. micuba Hromádka but might be distinguished by the impunctate median impression of the pronotum, deeper and more conspicuous impressions on elytra and different sexual characters. It is also similar to S. latipectus sp. nov. and S. tianquanensis sp. nov., but can be distinguished by the characters listed in the key.

Distribution. China (Sichuan Province).

Etymology. The species name is derived from “Gonggashan”, the type locality.

Figures

FIGURES 1 – 5. Stenus cephalotes group, habitus. 1 — S. substrictus sp. nov.; 2 — S. breviculus sp. nov.; 3 — S. gonggashanus sp. nov.; 4 — S. latipectus sp. nov.; 5 — S. tianquanensis sp. nov. Scale bars 1 mm.

FIGURES 16 – 20. Details of Stenus gonggashanus sp. nov. 16 — male 8 th sternite; 17 — male 9 th sternite; 18 — aedeagus in ventral view; 19 — expulsion clasp of aedeagus; 20 — spermatheca. Scale bars 0.25 mm.