Nazeris claviger, Assing, 2014

Assing, Volker, 2014, A revision of Nazeris. VI. On the fauna of East Yunnan, China (Coleoptera: Staphylinidae: Paederinae), Beiträge Zur Entomologie = Contributions to Entomology 64 (2), pp. 355-373 : 361-363

Nazeris claviger sp. n.

( Figs 20–25 , 33 , Map 2 )

Type material: Holotype ♂: “ CHINA [20] – Yunnan, mt. W Gejiu, mixed forest, 23°24'13"N, 103°07'28"E, 1990 m, 23.VIII.2014, V. Assing / Holotypus ♂ Nazeris claviger sp. n., det. V. Assing 2014” (cAss).

Paratypes: 13♂♂, 6 ♀♀ [3 ♂♂, 2 ♀♀ teneral]: same data as holotype (cAss, MNHUB) ; 13♂♂, 12 ♀♀ [1 ♂, 2 ♀♀ teneral]: same data as holotype, but leg. M. Schülke (cSch) ; 4 ♂♂, 4 ♀♀ [1 ♂, 2 ♀♀ teneral]: “ CHINA [20a] – Yunnan, mt. W Gejiu, mixed forest, 23°24'13"N, 103°07'28"E, 1990 m, 24. VIII.2014, V. Assing” (cAss, MNHUB) ; 1 ♂, 2 ♀♀ [1♂ teneral]: same data, but leg. M. Schülke (cSch) ; 2 ♂♂, 3 ♀♀ [1 ♀ teneral]: “ CHINA [20b] – Yunnan, mt. W Gejiu, mixed forest, 23°24'13"N, 103°07'28"E, 1990 m, 25. VIII.2014, V. Assing” (cAss, MNHUB) ; 4 ♂♂ [1 teneral]: same data, but leg. M. Schülke (cSch) .

Etymology: The specific epithet (Latin, noun in apposition: carrier of clubs) alludes to the distinctly club-shaped dorso-lateral apophyses.

Description: Moderately large species; body length 5.8–7.5 mm; length of forebody 3.1–3.5 mm. Coloration: body blackish; legs and antennae yellowish, with antennomere I often slightly darker.

Head ( Fig. 20 ) weakly oblong, approximately 1.05 times as long as broad; lateral contours behind eyes smoothly and weakly curving towards posterior constriction in dorsal view, posterior angles obsolete; punctation very dense, moderately coarse, and distinctly umbilicate; interstices forming narrow ridges, without microsculpture. Eyes approximately one-third as long as distance from posterior margin of eye to posterior constriction in dorsal view. Antenna 1.8–2.0 mm long.

Pronotum ( Fig. 20 ) approximately 1.2 times as long as broad and 0.90–0.95 times as broad as head; punctation very dense and much coarser than that of head; midline posteriorly with short and narrow impunctate glossy elevation; lateral portions without distinct impressions or elevations; interstices without microsculpture and glossy.

Elytra ( Fig. 20 ) 0.51–0.55 times as long as pronotum; humeral angles obsolete; punctation approximately as coarse and as dense as that of pronotum; interstices without microsculpture and glossy. Hind wings completely reduced. Metatarsomere I elongated, nearly as long as the combined length of II–V.

Abdomen 1.20–1.25 times as broad as elytra; punctation coarse and very dense on tergites III–VI, slightly finer and slightly sparser on tergites VII and VIII; interstices usually without microreticulation, rarely with shallow traces near posterior margin of tergite VII; posterior margin of tergite VII usually with, rarely without narrow rudiment of a palisade fringe; posterior margin of tergite VIII strongly convex.

♂: sternite VII ( Fig. 21 ) approximately 1.6 times as broad as long, with shallow postero-median impression, posterior margin with shallow median concavity, this concavity with a dense lateral cluster of long black setae on either side ( Fig. 22 ); sternite VIII ( Fig. 23 ) approximately as long as broad and with moderately convex anterior margin, posterior excision narrow and anteriorly acute, slightly less than 0.3 times as deep as length of sternite; aedeagus ( Figs 24–25 ) approximately 1.6 mm long; ventral process very long, apico-ventrally deeply incised in the middle, apically of distinctive shape both in ventral and in lateral view, basally without a short semicircular projection on either side; dorso-lateral apophyses weakly sclerotized, very short, far from reaching middle of ventral process, weakly curved, strongly dilated in apical half (club-shaped) ( Fig. 33 ).

Comparative notes: The morphology of the aedeagus and the derived shape and chaetotaxy of the male sternite VII leave no doubt that N. claviger belongs to the N. brevilobatus group. It is distinguished from other species of this group particularly by the chaetotaxy of the male sternite VII (more pronounced posterior clusters of black setae) and by the morphology of the aedeagus (shapes of ventral process and of dorso-lateral apophyses).

Distribution and natural history: The type locality is situated in a mountain close to, and to the west of, Gejiu in southeastern Yunnan ( Map 2 ). The partly teneral specimens were sifted from litter and various debris in a mixed forest at an altitude of nearly 2000 m. For an illustration of the type locality see Assing (in press: figure 8).

Figures

Map 2: Distribution of the named species of Nazeris brevilobatus group in eastern Yunnan: N. brevilobatus sp. n. (white circle); N. virilis sp. n. (black circles); N. claviger sp. n. (black diamond); N. constrictus sp. n. (white triangles), N. discissus sp. n. (black square).

Figs 14–25: Nazeris constrictus sp. n. (14–19) and N. claviger sp. n. (20–25): forebody (14, 20); male sternite VII (15, 21); posteromedian portion of male sternite VII (16, 22); male sternite VIII (17, 23); aedeagus in lateral and in ventral view (18–19, 24–25). Scale bars: 14, 20: 1.0 mm; 15, 17–19, 21, 23–25: 0.5 mm; 16, 22: 0.2 mm.

Figs 26–33: Nazeris discissus sp. n. (26–31), N. constrictus sp. n. (32), and N. claviger sp. n. (33): forebody (26); male sternite VII (27); postero-median portion of male sternite VII (28); male sternite VIII (29); aedeagus in lateral and in ventral view (30–31); median portion of aedeagus in ventral view (32–33). Scale bars: 26: 1.0 mm; 27, 29–31: 0.5 mm; 28, 32–33: 0.2 mm.