Nazeris excertus 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 : 49-50

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

Figs 6 , 33–39

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: 3 males, 2 females, same data as holotype. ( SNUC) .

Description. Body length 4.3–5.3 mm; forebody length 2.4–2.6 mm.

Body ( Fig. 6 ) reddish brown; antennae and legs yellowish brown.

Head ( Fig. 33 ) 1.00–1.03 times as long as wide; punctation moderately dense and coarse, distinctly umbilicate and partly confluent, interstices with fine microsculpture ( Fig. 34 ); postocular portion approximately 1.9–2.1 times as long as eye length.

Pronotum ( Fig. 33 ) 1.08–1.10 times as long as wide, 0.93–1.03 times as long and 0.88–0.96 times as broad as head; punctation non-umbilicate, moderately dense, less coarse than that of head; midline posteriorly with very short and narrow impunctate elevation; interstices lacking microsculpture.

Elytra ( Fig. 33 ) 0.64–0.68 times as long as wide, 0.53–0.58 times as long and 0.92–0.95 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 ( Fig. 35 ).

Male. Sternite VII ( Fig. 36 ) with posterior margin nearly truncate at middle. Sternite VIII ( Fig. 37 ) with triangular posterior excision. Aedeagus ( Figs 38, 39 ) well sclerotized; ventral process short, dorsal parts slightly widened near apex in ventral view, curved ventrad in lateral view; dorso-lateral apophyses slender, slightly curved and widened in apical third in ventral view, extending much beyond 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 1,700 –2,150 m.

Comparative notes. The new species is distinguished from all the known species of Nazeris from Guizhou and adjacent area by the microsculpture present on head and abdomen, and by the distinctive shape of the aedeagus, particularly the short ventral process and the long dorso-lateral apophyses ( Fig. 39 ).

Etymology. The specific epithet (Latin, adjective: outstretched) alludes to the dorso-lateral apophyses extending strongly beyond apex of 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 33–39. Nazeris excertus 33 forebody; 34 ventral surface of head; 35 abdominal tergite V; 36 male sternite VII; 37 male sternite VIII; 38 aedeagus in ventral view; 39 aedeagus in lateral view. Scale bars: 33 1.0 mm; 34–35 0.1 mm; 36–39 0.5 mm.