Stenus wugongshanus, Yu, Yi-Ming, Tang, Liang & Yu, Wei-Dong, 2014

Yu, Yi-Ming, Tang, Liang & Yu, Wei-Dong, 2014, Three new species of the Stenuscirrus group (Coleoptera, Staphylinidae) from Jiangxi, South China, ZooKeys 442, pp. 73-84 : 74

Taxon classification Animalia Coleoptera Staphylinidae

Stenus wugongshanus sp. n. Figs 1, 2, 7-17

Type material.

Holotype:CHINA: Jiangxi Prov.: ♂, Pingxiang City, Wugong Shan National Park, alt. 1500-1750 m, 21.VII.2013, Song, Yin & Yu leg. (SHNU). Paratypes:CHINA: Jiangxi Prov.: 1♂, 4♀♀, same data as holotype (SHNU); 6♂♂, 3♀♀, same locality, but alt. 1000-1350 m, 20.VII.2013, Song, Yin & Yu leg. (1♂, 1♀ in cPut, rest in SHNU).

Description.

BL: 2.9-3.4 mm, FL: 1.4-1.7 mm.

HW: 0.66-0.77 mm, PL: 0.47-0.54 mm, PW: 0.48-0.56 mm, EL: 0.49-0.51 mm, EW: 0.54-0.63 mm, SL: 0.35-0.40 mm.

Brachypterous. Head blackish, body reddish brown, each elytron with a large ill-defined orange spot, which is about 2/3 as long and about 1/2 as broad as the respective elytron, abdomen shiny; antennae reddish yellow, club infuscate; maxillary palpi and legs reddish yellow; clypeus brown, labrum reddish brown; moderately sparsely pubescent. Paraglossae oval.

Head 1.17-1.22 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion slightly convex, not reaching level of inner eye margins, with a broad impunctate line along midline; punctures round, slightly larger in median portion than near inner margins of eyes, diameter of large punctures about as wide as apex of 2nd antennal segment in cross section, interstices between punctures faintly microsculptured, narrower than half the diameter of punctures. Antennae, when reflexed, slightly extending beyond posterior margin of pronotum, antennomeres III–VIII distinctly narrower than II; IX–XI gradually broadened, forming loose club; relative length of segments from base to apex as 10.5: 6.5: 13.0: 7.5: 7.0: 5.0: 5.5: 3.5: 5.0: 6.0: 6.5.

Pronotum 0.95-1.00 times as long as wide, widest near middle and constricted at base; disk uneven, with distinct median longitudinal furrow of about half the length of pronotum and with an impunctate line along the middle; punctures round and moderately confluent, variable in size, diameter of large punctures about as wide as middle of 2nd antennal segment in cross section, interstices with dense microsculpture, much narrower than half the diameter of punctures.

Elytra 0.92-0.97 times as long as wide, distinctly constricted at base, lateral margins gradually divergent posteriad; disk uneven with distinct humeral impression, distinct sutural impression and rather faint postero-lateral impression; punctures fusiform and confluent, larger than those on pronotum, interstices between punctures microsculptured, much narrower than half the diameter of punctures.

Hind tarsi 0.70-0.75 times as long as hind tibiae, tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow and smooth, present only in segment III, segments IV–VI with tergites and sternites entirely fused and traces of paratergites present only at base of each segment, posterior margin of tergite VII with indistinct palisade fringe; punctures round, dense at the base of each tergite, gradually becoming smaller posteriad, interstices smooth.

Male. Sternite VII with shallow emargination at middle of posterior margin, sternite VIII (Fig. 7) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 8) with long apicolateral projections, posterior margin serrate and slightly produced in the middle; tergite X (Fig. 9) with posterior margin truncate and slightly emarginated in the middle. Aedeagus (Figs 10, 11) with median lobe subparallel-sided, apical sclerotized portion triangular with round projection at apex, expulsion hooks (Fig. 13) large, strongly sclerotized; parameres slender and almost straight, extending a little beyond apex median lobe, swollen at apex, each with about 11 setae on apico-internal margin (Fig. 12).

Female. Abdomen slightly broader than that of male; sternite VIII (Fig. 14) with posterior margin weakly pointed at middle; tergite X (Fig. 15) with posterior margin truncate; spermathecal duct with basal portion strongly sclerotized and the remainder weakly sclerotized (Figs 16, 17).

Distribution.

Jiangxi Province: Wugong Shan (China).

Diagnoses.

Stenus wugongshanus resembles Stenus huangganmontium Puthz, 2003 (Wuyishan, Jiangxi Province) in most aspects, but may be distinguished by the lack of paratergites on segments IV and V, which are present in Stenus huangganmontium .

Etymology.

The specific name is derived from “Wugongshan”, the type locality of this species.