The Nazeris fauna of the Leigong Mountain, Guizhou, China (Coleoptera, Staphylinidae, Paederinae) Author Lin, Xiao-Bin 0000-0003-2510-479X Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai, 200234, China. & 1608049791 @ qq. com; https: // orcid. org / 0000 - 0003 - 2510 - 479 X 1608049791@qq.com Author Yu, De-Hui 0000-0003-3662-0132 Leigongshan Natural Reserve, Leishan County, Guizhou Province, 557199, P. R. China. & yudehui 503 @ 163. com; https: // orcid. org / 0000 - 0003 - 3662 - 0132 Author Hu, Jia-Yao 0000-0002-9861-9551 Laboratory of Systematic Entomology, College of Life Sciences, Shanghai Normal University, 100 Guilin Road, Xuhui District, Shanghai, 200234, China. & hujiayao @ shnu. edu. cn; https: // orcid. org / 0000 - 0002 - 9861 - 9551 hujiayao@shnu.edu.cn text Zootaxa 2022 2022-05-16 5138 1 41 53 journal article 55519 10.11646/zootaxa.5138.1.4 160ab352-6b26-4553-8082-5516c0c2176b 1175-5326 6552139 86A410C0-6C8F-4FDF-8973-ADCA2CC498EE Nazeris serratus Lin, Yu & Hu , sp. n. Figs 7 , 40–44 Type material. Holotype : CHINA : male: " China : Guizhou , Rongjiang County , Xiaodanjiang , 26°20'16.09''N , 108°20'23.34''E , 700 m , 5.v.2021 , Tang, Peng, Cai & Song leg." ( SNUC ) . Paratypes : 25 males , 26 females , same data as holotype. ( SNUC ) . Description. Body length 4.1–4.5 mm ; forebody length 2.3–2.6 mm . Body ( Fig. 7 ) reddish brown; antennae and legs yellowish brown. Head ( Fig. 40 ) 1.10–1.19 times as long as wide; punctation very dense, moderately coarse, distinctly umbilicate and partly confluent, interstices lacking microsculpture; postocular portion approximately 1.7–1.9 times as long as eye length. FIGURES 40–44. Nazeris serratus 40 forebody; 41 male sternite VII; 42 male sternite VIII; 43 aedeagus in ventral view; 44 aedeagus in lateral view. Scale bars: 40 1.0 mm; 41–44 0.5 mm. Pronotum ( Fig. 40 ) 1.12–1.17 times as long as wide, 0.88–1.06 times as long and 0.90–0.94 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. 40 ) 0.65–0.68 times as long as wide, 0.55–0.57 times as long and 0.94–0.98 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. 41 ) with posterior margin shallowly emarginated in the middle. Sternite VIII ( Fig. 42 ) with triangular posterior excision. Aedeagus ( Figs 43, 44 ) moderately sclerotized; ventral process long, with acute apex in ventral view; dorso-lateral apophyses with inner sides serrated in ventral view, extending slightly beyond apex of ventral process. Distribution and habitat data. The species is known from Xiaodanjiang in eastern Guizhou . The specimens were collected by sifting leaf litter at an altitude of 700 m . Comparative notes. This species is very similar in general appearance to N. maoershanus Hu & Qiao ( Hu & Qiao 2019: 435 , Figs 12–16 ) and N. huapingensis Hu & Li ( Hu & Li 2017: 336 , Figs 10–14 ) and separated only by the aedeagal characters: the ventral process with acute apex and by the serrated inner sides of dorso-lateral apophyses of aedeagus ( Fig. 43 ). Etymology. The specific epithet (Latin, adjective: serrated) alludes to the serrated dorso-lateral apophyses of the aedeagus.