Nazeris muricatus 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 : 49

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

Figs 5 , 28–32

Type material. Holotype: CHINA: male: " China: Guizhou, Leishan County, Leigong Mt. , Xiannütang , 26°22'22.11''N, 108°11'52.12''E, 1550 m, 3.v.2021, Tang, Peng, Cai & Song leg." ( SNUC) . Paratypes: 1 male, same data as holotype ; 2 males, 2 females, same data, except "summit of Leigong Mt. , 26°23'13.78''N, 108°12'11.87''E, 1700–2150 m, 1.v.2021 " ; 1 male, 1 female, same data, except " Rongjiang County, Xiaodanjiang , 26°20'16.09''N, 108°20'23.34''E, 700 m, 5.v.2021 " ( SNUC) .

Description. Body length 5.4–5.7 mm; forebody length 2.8–3.2 mm.

Body ( Fig. 5 ) dark brown; legs reddish brown; antennae reddish brown to light brown.

Head ( Fig. 28 ) 1.01–1.05 times as long as wide; punctation moderately dense and coarse, distinctly umbilicate, interstices lacking microsculpture; postocular portion approximately 1.8–2.0 times as long as eye length.

Pronotum ( Fig. 28 ) 1.08–1.16 times as long as wide, 0.95–1.03 times as long and 0.90–0.93 times as broad as head; punctation non-umbilicate, moderately dense and as coarse as that of head; midline posteriorly with very short and narrow impunctate elevation; interstices lacking microsculpture.

Elytra ( Fig. 28 ) 0.52–0.60 times as long as wide, 0.50–0.53 times as long and 0.97–1.03 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; with fine microsculpture on all tergites.

Male. Sternite VII ( Fig. 29 ) with posterior margin truncate at middle. Sternite VIII ( Fig. 30 ) with V-shaped posterior excision. Aedeagus ( Figs 31, 32 ) moderately sclerotized; ventral process long, narrowed apicad, with acute apex in ventral view, curved ventrad in lateral view; dorso-lateral apophyses slender, distinctly curved in ventral view, slightly widened near apex in ventral view, not reaching apex of ventral process.

Distribution and habitat data. The species is known from Leigong Mt. and Xiaodanjiang in eastern Guizhou. The specimens were collected by sifting leaf litter at altitudes of 700–2,150 m.

Comparative notes. The new species is very similar to N. rugosus Hu & Qiao ( Hu & Qiao 2019: 436, Figs 17–24 ) in general appearance but can be separated by the microsculpture only present on abdomen, by the ventral process of aedeagus distinctly wider and lacking basal laminae in ventral view ( Fig. 32 ).

Etymology. The specific epithet (Latin, adjective: pointed) alludes to the pointed ventral process of the aedeagus.

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 28–32. Nazeris muricatus 28 forebody; 29 male sternite VII; 30 male sternite VIII; 31 aedeagus in ventral view; 32 aedeagus in lateral view. Scale bars: 28 1.0 mm; 29–32 0.5 mm.

FIGURES 13–17. Nazeris resimus 13 forebody; 14 male sternite VII; 15 male sternite VIII; 16 aedeagus in ventral view; 17 aedeagus in lateral view. Scale bars: 13 1.0 mm; 14–17 0.5 mm.

FIGURES 18–22. Nazeris leigongensis 18 forebody; 19 male sternite VII; 20 male sternite VIII; 21 aedeagus in ventral view; 22 aedeagus in lateral view. Scale bars: 18 1.0 mm; 19–22 0.5 mm.

FIGURES 23–27. Nazeris yujiei 23 forebody; 24 male sternite VII; 25 male sternite VIII; 26 aedeagus in ventral view; 27 aedeagus in lateral view. Scale bars: 23 1.0 mm; 24–27 0.5 mm.