Stenus longchishanicus Lv et Zhou

Lv, Wei-Xiang, Zhao, Cai-Yun & Zhou, Hong-Zhang, 2018, Ta xonomic study on the Chinese Steninae (Coleoptera, Staphylinidae), with descriptions of three new species of the Genus Stenus Latreille, Zootaxa 4429 (2), pp. 247-268: 248-249

publication ID

https://doi.org/10.11646/zootaxa.4429.2.2

publication LSID

lsid:zoobank.org:pub:F0914D76-A4EB-45B7-A1EC-13F4B9C7BA52

persistent identifier

http://treatment.plazi.org/id/040A8791-FFD4-FFCE-5DC8-1756491EBA95

treatment provided by

Plazi

scientific name

Stenus longchishanicus Lv et Zhou
status

sp. nov.

1. Stenus longchishanicus Lv et Zhou  , sp. nov.

( Figs. 1 View Figure & 2 View Figure )

Type locality: China: Sichuan: Dujiangyan County. 

Type material. Holotype: male, China: Sichuan: Dujiangyan County, Longchishan (30°97'N, 103°62'E), 180 m, 26.VIII.2005, Xiao-Yan Li leg. (IZ-CAS)  . Paratypes. 5 males, 3 females, same data as for the holotype. (IZ-CAS). 

Description. BL: 3.7–4.0 mm, FL: 1.9–2.1 mm, HW: 0.83–0.86 mm, PL: 0.64–0.68 mm, PW: 0.63–0.67 mm, EL: 0.71–0.73 mm, EW: 0.82–0.84 mm, SPLAbout SPL: 0.53–0.54 mm.

Brachypterous; body dark brown except head black. Antennae yellowish, club slightly infuscate; maxillary palpi yellowish, segment III infuscate; legs red brown, but knees darker; clypeus black, labrum dark brown with sparse pubescent; paraglossae oval.

Head slightly broader than elytra. Frons broad with a pair of deep and broad longitudinal furrows, median portion distinctly elevated, slightly extending beyond the level of dorsal eye margins; punctures round, partly confluent, diameter of the largest punctures as large as largest cross section of antennal segment II; interstices smooth, distinctly smaller than half the diameter of punctures. Antenna slender, when reflexed distinctly extending beyond the posterior margin of pronotum.

Pronotum slightly longer than broad, disk uneven, with a broad median furrow throughout, two moderately deep impression in the middle; punctures confluent, varied in size, as large as those on frons; interstices distinctly ridge-like, narrower than half the diameter of punctures.

Elytra shorter than broad; weakly uneven, shoulders oblique, postero-lateral impression indistinct, humeral impression and long sutural impression shallow; punctuation shallow, mostly well delimited, slightly smaller than those on pronotum; interstices smooth, distinctly smaller than diameter of punctures.

Legs slender; tarsomeres IV deeply bilobed.

Abdomen cylindrical, with line-like paratergites on segments III–VI and shallow basal furrows on anterior segments, tergite VII without apical membranous fringe; punctures round, punctures of abdominal tergite III as large as those on elytra in average, gradually becoming smaller and sparser posteriorly; punctures on tergite VII slightly smaller than eye facets near dorsal eye margin. Interstices smooth, larger than diameter of punctures.

Male: sternite VIII ( Figs. 1 F View Figure & 2 B View Figure ) posteromedially with a semi-circular-shaped emargination; sternite IX ( Figs. 1 G View Figure & 2 C View Figure ) with long acute apicolaterally, posterior margin serrate; tergite IX & X ( Figs. 1 H View Figure & 2 D View Figure ) entire posteriorly. Aedeagus ( Figs. 1 E View Figure & 2 A View Figure ) almost elongate-ovoidal, acutely pointed apex; apical sclerotized area triangular, with vague longitudinal keels. Endophallus with median bands moderately long; expulsion clasps almost H-shaped, connected by the point a little behind the middle of mesial margin; copulatory tube relatively short, thickening posteriorly. Parameres extending posteriorly a little beyond the apex of median lobe, tapering apicad at apical sixth, each with 4 subapical setae and 6 basal setae on apical area margins.

Female: sternite VIII ( Figs. 1 I View Figure & 2 E View Figure ) entire; sternite X ( Figs. 1 J View Figure & 2 F View Figure ) convex at posterior margin. Gonocoxite ( Figs. 1 K View Figure & 2 G View Figure ). ( Figs. 2 H View Figure ) with distinct basal porch, the rest duct undetected.

Distribution. China (Sichuan).

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

Remarks. Stenus longchishanicus Lv et Zhou  , sp. nov. belongs to Stenus aureolus  group. The new species can be easily distinguished from other related species by the following characters: body dark brown without elytra spot, tergites III–VI with distinct paratergites and different details of other sexual characters.

SPL

Palynological Laboratory

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Stenus