Oedichirus damingensis, Li, Wen-Rong, Xie, Nan-Nan & Li, Li-Zhen, 2015

Li, Wen-Rong, Xie, Nan-Nan & Li, Li-Zhen, 2015, Redescription of Oedichirus flammeus Koch, and description of two new Oedichirus species from China (Coleoptera, Staphylinidae, Paederinae, Pinophilini), Zootaxa 3911 (1), pp. 81-90 : 86-87

Oedichirus damingensis sp. n.

Figs 2 C, 2D, 4

Type material (5 ♂♂, 3 ♀♀). Holotype, ♂: “ China, Guangxi, Wuming County, Daming Shan, 1200–1300 m, 30.vii.2012, Hu & Song leg. / Holotypus, ♂, Oedichirus damingensis , sp. n., Li et al., det. 2014 ( SNUC).” Paratypes, 4 ♂♂, 3 ♀♀: same data as holotype. ( SNUC).

Description. BL: 7.78–8.23 mm, FL: 3.56–3.89 mm, HL: 0.92–1.07 mm, HW: 1.18–1.23 mm, PL: 1.23–1.38 mm, PW: 1.10–1.17 mm, EL: 1.15–1.32 mm, EW: 0.98–1.15 mm. Habitus as in Figs 2 C, 2D. Body concolorous, dark reddish brown to nearly black. Legs bicolored, yellowish brown with apices of femora and bases of tibiae narrowly reddish brown to nearly black.

Head transverse, 1.13–1.21 times as broad as long, broadest across eyes, posterior angles obsolete. Frontoclypeal ridge straight to curved and imcomplete, separated medially. Dorsal surface without impression; surface with coarse, moderately dense punctures. Postero-median region with denser punctation. Eyes strongly convex, 1.33–1.7 times as long as distance from posterior margin of eye to posterior constriction.

Pronotum 0.83–1.0 times as broad as head and 1.11–1.17 times as long as broad, widest anteriorly and distinctly tapering posteriorly. Median dorsal portion with dense and irregular coarse, postero-median region with relatively sparser and coarser punctures. Punctation distributed in indistinct series on either side of midline, midline and oblong lateral callosities impunctate.

Elytra short and depressed (EW/EL=1.04–1.23, EL/PL=0.89–0.97); surface with dense and coarse punctation. Hind wing completely reduced.

Abdomen with dense and irregular punctation not arranged in rows, punctation on segments III-VI coarser and denser than on segments VII and VIII. Anterior impressions of tergites III-VI without longitudinal keels; anterior impressions of tergites III-VII with pronounced reticulate microsculpture, remainder of tergal surfaces with very shallow and fine microsculpture composed of transverse striae; microsculpture of tergite VIII composed of transverse meshes.

Male. Sternites VI-VI unmodified. Sternite VII ( Fig. 4 D) with symmetric square-shaped impression in posteromedian portion; this impression impunctate, but posteriorly with moderately short and stout dark setae, and laterally delimited by pronounced folds on either side; posterior margin weakly bisinuate in middle. Sternite VIII ( Fig. 4 E) impressed in middle; median portion with distinctive oval-shaped structure with spur-shaped or lineshaped carina in middle; posterior margin with symmetric, broad, deep posterior excision, this excision of subtriangular shape. Tergite VIII ( Fig. 4 F) with posterior margin weakly convex in middle; transverse basal ridge curved and interrupted in middle. Tergite IX ( Fig. 4 G) with posterior processes 1.24–1.43 times as long as median portion of tergite IX. Sternite IX shaped as in Fig. 4 H. Aedeagus ( Figs 4 A–4C) asymmetric; ventral process long, flattened and acutely pointing ventrad in lateral view, subapically with two conspicuous processes pointing ventrad. Parameres moderately long and slender apically.

Female. Sternites IV-VIII unmodified. Segment IX shaped as in Fig. 4 I.

Etymology. The specific epithet (adjective) is derived from the Daming Shan where the type locality is situated.

Comparative notes. Oedichirus damingensis is most similar in general appearance to O. sp.3 from Diancang Shan, Yunnan (in press by Assing) and O. pengzhongi sp. n. from Jianfengling, Hainan (described below), but is easily separated from the former by the different chaetotaxy of the male sternite VII (with pronounced median impression posteriorly, and with numerous modified, very short and stout setae) and the different morphology of the aedeagus; from the latter by the special median structure of the sternite VIII and the longer ventral process of the aedeagus (lateral view).

Habitat and distribution. The type locality is situated in the Daming Shan, Guangxi, South China. The specimens were sifted from leaf litter in a mixed forest at an altitude of 1200–1300 m.

Figures

FIGURE 2. Oedichirus flammeus, O. damingensis and O. pemgzhongi. A, B O. flammeus habitus, dorsal, ventral C, D O. damingensis habitus, dorsal, ventral E, F O. penzhongi habitus, dorsal, ventral. Scales: A – F 1 mm.

FIGURE 4. Oedichirus damingensis. A aedeagus, left lateral B aedeagus, ventral C aedeagus, right lateral D male sternite VII E male sternite VIII F male tergite VIII G male tergite IX H male sternite IX I female segment IX, ventral. Scales: A – I 0.5 mm.