Nazeris xizangensis 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 : 473-474

Nazeris xizangensis Hu & Li , sp. n.

( Figs. 1 , 4–8 , 20 )

Type material. Holotype: CHINA: male: " China: Xizang A. R., Nielamu County, Zhangmu Town , Lixin village , 2600 m, 18.VII.2010, Jian-Qing Zhu leg." ( SNUC).

Description. Body length 7.0 mm; forebody length 3.7 mm.

Body ( Fig. 1 ) dark brown; antennae and legs yellowish brown.

Head ( Fig. 4 ) 1.08 times as long as wide; punctation very dense, moderately coarse, distinctly umbilicate and partly confluent, interstices without microsculpture; postocular portion 1.95 times as long as eye length.

Pronotum ( Fig. 4 ) 1.19 times as long as wide, 0.89 times as broad and as long as head; punctation as dense and as coarse as that of head, partly confluent; midline lacking impunctate elevation; interstices without microsculpture. Elytra ( Fig. 4 ) 0.72 times as long as wide, 0.59 times as long and 0.97 times as broad as pronotum; punctation slightly less dense but coarser than that of pronotum; interstices without microsculpture.

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

Male. Sternite VII ( Fig. 5 ) with posterior margin simply rounded at middle. Sternite VIII ( Fig. 6 ) with Vshaped posterior excision. Aedeagus ( Figs. 7, 8 ) with ventral process slightly narrowed apically in ventral view; dorso-lateral apophyses short and slender, strongly curved subapically in ventral view, not reaching apex of ventral process.

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

Comparative notes. Based on the relatively large body, dense and umbilicate punctation of the head and the weakly modified male sternite VII, N. xizangensis undoubtedly belongs to the N. elegans group. The new species is similar to N. umbilicatus Assing, 2014 in general appearance and aedeagal characters, but can be separated by the rather fine microsculpture of abdominal tergites, and by the wider ventral process of the aedeagus and the slightly more slender dorso-lateral apophyses ( Figs. 7, 8 ).

Etymology. The specific epithet is derived from Xizang, where the species was discovered.

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 4 – 8. Nazeris xizangensis 4 — forebody; 5 — male sternite VII; 6 — male sternite VIII; 7 — aedeagus, in ventral view; 8 — aedeagus, in lateral view. Scale bars: 4: 1 mm, 5 – 8: 0.5 mm