Paederus (Gnathopaederus) zhangmuensis Cheng and Peng, 2019

Cheng, Zhi-Fei & Peng, Zhong, 2019, A new species and additional records of brachypterous Paederus (Coleoptera, Staphylinidae) of mainland China and Taiwan, Zootaxa 4686 (1), pp. 127-132 : 129-132

Paederus (Gnathopaederus) zhangmuensis Cheng and Peng , new species

( Figs 2 , 3 )

Type material. HOLOTYPE: ♂, labeled ‘ China: Xizang Prov., Nielamu County, Zhangmu, Lixin , 2600 m, 26.VII.2010, Jian-Qing Zhu leg. ’ / HOLOTYPE (red), Paederus zhangmuensis sp. nov., det. Cheng & Peng, 2019 ( SNUC) . Paratypes: 2 ♂♂, 1 ♀, same label data as holotype / PARATYPE (yellow), Paederus zhangmuensis sp. nov., det. Cheng & Peng, 2019 ( SNUC) ; 2 ♂♂, 1 ♀: ‘ China: Xizang, Nielamu County, Zhangmu, Quxian , 3200 m, 24.VII.2010, Wen-Xuan Bi leg. ’ / PARATYPE (yellow), Paederus zhangmuensis sp. nov., det. Cheng & Peng, 2019 ( SNUC) .

Description. Measurements (in mm) and ratios: BL: 11.18–11.31; FL: 5.56–5.72; HL: 0.76–0.80; HW: 0.83– 0.91; AnL: 3.06–3.39; PL: 0.92–0.94; PW: 0.83–0.87; EL: 0.80–0.89; EW: 0.83–0.96; AW: 1.04–1.10; AL: 0.96– 1.06; HL/HW: 0.88–0.92; HW/PW: 1.00–1.05; HL/PL: 0.82–0.85; PL/PW: 1.08–1.12; EL/PL: 0.87–0.95; diameter of eye: 0.21–0.23.

Habitus as in Fig. 2A . Coloration: head and labrum black, labial palpi and antennae brown; pronotum brownish red; elytra metallic-blue; legs brown, with apical halves of the femora blackish; abdomen bicoloured with segments III-VI brownish red and segments VII-X black.

Head wider than long, widest across eyes; punctation coarse and sparse; interstices glossy. Eyes distinctly convex. Antenna as in Fig. 2A .

Pronotum nearly oviform, strongly convex in cross-section; punctures sparser and somewhat shallower than those of head.

Elytra nearly trapeziform; punctation coarse, defined and dense. Hind wings reduced. Metatarsomere I as long as combined length of metatarsomeres II and III.

Abdomen distinctly broader than elytra; punctation moderately coarse; interstices with shallow microsculpture; posterior margin of tergite VII without palisade fringe.

Male. Anterior margin of labrum ( Fig. 2C ) in middle with shallow excision. left mandible ( Fig. 2C ) without dorsal tooth, inner margin with one small tooth; right mandible ( Fig. 2C ) with one indistinct dorsal tooth, inner margin with single-pointed tooth. Posterior margin of tergite VIII ( Fig. 3D ) strongly convex; sternite V ( Fig. 2D ) with shallow median impression posteriorly, this impression with weakly modified and dark setae; sternite VI ( Fig. 2E ) with distinct median impression posteriorly, this impression with weakly modified and dark setae; sternite VII ( Fig. 2F ) strongly transverse, with distinct median impression posteriorly, this impression with numerous modified, short black setae, posterior excision rather shallow; sternite VIII ( Fig. 3E ) transverse and with deep posterior incision, this incision 0.5 times as long as sternite VIII; aedeagus as in Figs 3 F–H; dorsal plate apically acute; parameres apically very weakly curved; internal sac with single long sclerotized spine.

Female. Labrum as in Fig. 2B . Posterior margin of tergite VIII ( Fig. 3B ) convex; sternite VIII ( Fig. 3C ) poste- riorly with median process.

Comparative notes. This new species is distinguished from other species of this subgenus by an indistinct dorsal tooth on the right mandible, the chaetotaxy of the male sternites V–VII and the structure of the aedeagus (shape of parameres; single long sclerotized spine in the internal sac).

Distribution and natural history. The type locality is in Zhangmu to the south of Nielamu, southern Xizang. Some specimens were sifted from leaf litter from the floor of a mixed forest at an altitude of 2600 m.

Etymology. The species is named after its type locality (Zhangmu).

Figures

FIGURE 2. Paederus (Gnathopaederus) zhangmuensis. A—Habitus; B—female mouthparts; C—male mouthparts. D—male tergite V; E—male tergite VI; F—male sternite VII. Scale bars: A 3.0 mm, B–F 0.5 mm.

FIGURE 3. Paederus (Gnathopaederus) zhangmuensis. A—male forebody; B—female tergite VIII; C—female sternite VIII. D—male tergite VIII; E—male sternite VIII; F—aedeagus in ventral view; G—aedeagus in lateral view; H—aedeagus in dorsal view. Scale bars: A 3.0 mm, B–H 0.5 mm.