Nazeris biwenxuani Hu & Li

Hu, Jia-Yao, Pan, Zhao-Hui & Li, Li-Zhen, 2016, Three new species of Nazeris Fauvel in Xizang, China (Coleoptera, Staphylinidae, Paederinae), Zootaxa 4175 (5), pp. 473-479 : 477-478

Nazeris biwenxuani Hu & Li , sp. n.

( Figs. 3 , 14–20 )

Type material. Holotype: CHINA: male: " China: Xizang A. R., Bomi Hsien, Gu Xiang , 2600 m, 22.VIII.2010, Wen-Xuan Bi leg." ( SNUC) .

Description. Body length 5.6 mm; forebody length 3.1 mm.

Body ( Fig. 3 ) dark brown; antennae and legs brown.

Head ( Fig. 14 ) 1.13 times as long as wide; punctation very dense, rather coarse, distinctly umbilicate and partly confluent, interstices without microsculpture; postocular portion 2.33 times as long as eye length.

Pronotum ( Fig. 14 ) 1.23 times as long as wide, 0.81 times as broad and 0.88 times as long as head; punctation moderately dense and coarser than that of head; midline with narrow impunctate elevation in posteriorly half; interstices without microsculpture. Elytra ( Fig. 14 ) 0.74 times as long as wide, 0.61 times as long and as broad as pronotum; punctation as dense and slightly less coarse than that of pronotum; interstices without microsculpture.

Abdomen with punctation dense and rather coarse on tergites III–V, dense and less coarse on tergite VI, moderately dense and fine on tergites VII–VIII; interstices lacking microsculpture.

Male. Sternite VII ( Fig. 15, 16 ) with posterior margin distinctly prominent at middle and with some stout black setae subapically. Sternite VIII ( Fig. 17 ) with triangular posterior excision. Aedeagus ( Figs. 18, 19 ) with ventral process short, slightly narrowed near middle in ventral view; dorso-lateral apophyses very long, slightly curved in ventral view, extending far beyond apex of ventral process.

Distribution and habitat data. The species is known only from Bomi in east Xizang ( Fig. 20 ). The specimen was collected at an altitude of 2600 m.

Comparative notes. Based on the distinctly modified male sternite VII, and the structure of the aedeagus, the new species is quite different from all of the species groups from the Himalaya. It is distinguished from the similar and geographically close N. motuensis Hu, Li & Zhao, 2008 by the much narrower ventral process of aedeagus and much longer dorso-lateral apophyses ( Figs. 18, 19 ).

Etymology. The species is named in honor of Wen-Xuan Bi, collector of the new species.

Figures

FIGURE 20. Map showing the distribution of Nazeris in Xizang A— N. motuensis; B— N. tangi; C— N. xizangensis; D— N. zhujianqingi; E— N. biwenxuani.

FIGURES 1 – 3. Habitus 1 — Nazeris xizangensis; 2 — N. zhujianqingi; 3 — N. biwenxuani. Scale bars: 1 mm.

FIGURES 14 – 19. Nazeris biwenxuani 14 — forebody; 15 — male sternite VII; 16 — postero-median portion of male sternite VII; 17 — male sternite VIII; 18 — aedeagus, in ventral view; 19 — aedeagus, in lateral view. Scale bars: 14: 1 mm, 15, 17 – 19: 0.5 mm, 16: 0.25 mm.