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.

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.