Nazeris ingentis Lin, Yu & Hu, 2022

Lin, Xiao-Bin, Yu, De-Hui & Hu, Jia-Yao, 2022, The Nazeris fauna of the Leigong Mountain, Guizhou, China (Coleoptera, Staphylinidae, Paederinae), Zootaxa 5138 (1), pp. 41-53 : 42

Nazeris ingentis Lin, Yu & Hu , sp. n.

Figs 1 , 8–12

Type material. Holotype: CHINA: male:" China: Guizhou, Leishan County, summit of Leigong Mt. , 26°23'13.78''N, 108°12'11.87''E, 1700–2150 m, 1.v.2021, Tang, Peng, Cai & Song leg." ( SNUC) . Paratypes: 1 male, 7 females, same data as holotype ; 2 females, same data, except " Leigong Mt. , Xiannütang, 26°22'22.11''N, 108°11'52.12''E, 1550 m, 3.v.2021 " ( SNUC) .

Description. Body length 7.7–8.1 mm; forebody length 3.6–4.3 mm.

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

Head ( Fig. 8 ) 1.06–1.11 times as long as wide; punctation very dense, moderately coarse, distinctly umbilicate, interstices lacking microsculpture; postocular portion approximately 1.8–2.1 times as long as eye length.

Pronotum ( Fig. 8 ) 1.12–1.18 times as long as wide, 0.95–1.02 times as long and 0.88–0.96 times as broad as head; punctation non-umbilicate, moderately dense and as coarse as that of head; midline posteriorly with short and very narrow impunctate elevation; interstices lacking microsculpture.

Elytra ( Fig. 8 ) 0.63–0.72 times as long as wide, 0.53–0.61 times as long and 0.94–0.99 times as broad as pronotum; punctation as dense as, and slightly coarser than that of pronotum; interstices lacking 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. 9 ) with posterior margin U-shaped emarginated in the middle. Sternite VIII ( Fig. 10 ) with U-shaped posterior excision. Aedeagus ( Figs 11, 12 ) well sclerotized; with ventral process long and straight, widened near middle in ventral view; dorso-lateral apophyses moderately strong, distinctly curved in ventral view, curved dorsally and subtriangularly widened near apical third in lateral view, not reaching apex of ventral process.

Distribution and habitat data. The species is known from Leigong Mt. in eastern Guizhou. The specimens were collected by sifting leaf litter at altitudes of 1,550 –2,150 m.

Comparative notes. The new species is very similar to N. giganteus Watanabe & Xiao , ( Watanabe & Xiao 1997: 3, Figs 1, 2, 6–8 ) in general appearance and aedeagal characters, but can be separated by the U-shaped posterior excision of male sternite VII ( Fig. 9 ), and by the smaller subtriangular expansion of dorso-lateral apophyses of aedeagus ( Fig. 12 ).

Etymology. The specific epithet (Latin, adjective: large) alludes to the large size of this species.

Figures

FIGURES 1–7. Habitus 1 N. ingentis; 2 N. resimus; 3 N. leigongensis; 4 N. yujiei; 5 N. muricatus; 6 N. excertus; 7 N. serratus. Scale bars: 1.0 mm.

FIGURES 8–12. Nazeris ingentis 8 forebody; 9 male sternite VII; 10 male sternite VIII; 11 aedeagus in ventral view; 12 aedeagus in lateral view. Scale bars: 8 1.0 mm; 9–12 0.5 mm.