Nazeris bulbosus, 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 : 368-370

Nazeris bulbosus sp. n.

( Figs 52–59 , Map 3 )

Type material: Holotype ♂: “ CHINA [4] – Yunnan, NE Kunming, 25°09'07"N, 102°53'46"E, 2280 m, sec. pine for. with alder, 11.VIII.2014, V. Assing / Holotypus ♂ Nazeris bulbosus sp. n., det. V. Assing 2014” (cAss).

Paratypes: 22 ♂♂, 13 ♀♀ [8 ♂♂, 7 ♀♀ teneral]: same data as holotype (cAss, MNHUB) ; 13 ♂♂, 10 ♀♀ [2 ♂♂, 1 ♀ teneral]: same data, but leg. M. Schülke (cSch) ; 4 ♂♂, 4 ♀♀ [2 ♂♂ teneral]: “ CHINA [5] – Yunnan, NE Kunming, 25°08'40"N, 102°53'48"E, 2290 m, mixed forest, sifted, 11. VIII.2014, V. Assing” (cAss, MNHUB) ; 3 ♂♂, 4 ♀♀ [3 ♀♀ teneral]: same data, but leg. M. Schülke (cSch) ; 4 ♂♂, 5 ♀♀ [1 teneral]: “ CHINA [6] – Yunnan, NE Kunming, 25°08'35"N, 102°53'49"E, 2320 m, mixed forest, sifted, 13. VIII.2014, V. Assing” (cAss, MNHUB) ; 3 ♂♂, 3 ♀♀ [1 ♀ teneral]: same data, but leg. M. Schülke (cSch) .

Etymology: The specific epithet is an adjective derived from the Latin noun bulbus (onion, garlic) and alludes to the shape of ventral process of the aedeagus in ventral view, which somewhat resembles an elongated onion.

Description: Species of relatively small size; body length 4.2–5.5 mm; length of forebody 2.4–2.7 mm. Coloration: body blackish-brown to blackish, with the head often dark reddish-brown; legs and antennae yellowish.

Head ( Fig. 52 ) weakly to moderately oblong, 1.02– 1.09 times as long as broad; lateral contours behind eyes relatively strongly convex in dorsal view; punctation very dense and rather coarse, not confluent, and distinctly umbilicate; interstices forming narrow ridges, without microsculpture. Eyes mostly slightly more than one-third as long as distance from posterior margin of eye to posterior constriction in dorsal view, rarely shorter. Antenna 1.4–1.5 mm long.

Pronotum ( Fig. 52 ) relatively weakly oblong, approximately 1.10–1.15 times as long as broad and 0.90–0.95 times as broad as head; punctation very dense, deeper and coarser than that of head; midline posteriorly with or without short and very narrow impunctate glossy band; lateral portions regular punctation, without distinct impressions or elevations; interstices without microsculpture and glossy.

Elytra ( Fig. 52 ) approximately 0.55 times as long as pronotum; humeral angles obsolete; punctation very dense, less coarse than 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 approximately 1.2 times as broad as elytra; punctation coarse and dense on tergite III, gradually becoming less dense towards tergite V, distinctly finer and sparser on tergites VI–VIII; interstices without microreticulation; posterior margin of tergite VII without palisade fringe; posterior margin of tergite VIII moderately convex.

♂: sternite VII ( Fig. 53 ) moderately transverse, approximately 1.55 times as broad as long, with sparse pubescence, without conspicuous modifications; sternite VIII ( Fig. 54 ) transverse, 1.10–1.15 times as broad as long, posterior excision rather small and V-shaped and approximately one-fifth as deep as length of ster- nite; aedeagus ( Figs 55–58 ) 0.80–0.87 mm long; ventral process short, shaped like an oblong onion in ventral view, laterally not compressed; dorso-lateral apophyses stout, strongly curved (ventral view), strongly sclerotized, apically dilated and vertically truncate, and moderately long, extending slightly beyond apex of ventral process.

Comparative notes: Based on the external and the male primary and secondary sexual characters, N. bulbosus is closely allied to N. zhangi from the Yuan Shan to the West of Kunming, from which it differs by larger body size ( N. zhangi : body length according to the original description 4.1–4.4 mm; length of forebody 2.3–2.4 mm) the darker coloration of the forebody ( N. zhangi : according to the original description “reddish brown to reddish black”), the paler antennomere I ( N. zhangi : according to the original description yellowish-brown), and particularly by the apically stouter and vertically truncate dorso-lateral apophyses of the aedeagus ( N. zhangi : dorso-lateral apophyses apically distinctly oblique with acute internal angle). For illustrations of N. zhangi see WATANABE & XIAO (1993).

Distribution and natural history: The known distribution of N. bulbosus is confined to three geographically close localities to the northeast of Kunming ( Map 3 ). The specimens were sifted from litter in a secondary pine forest, a mixed deciduous forest with scattered pine trees, and a mixed forest with alder, oak and pine at altitudes of 2280–2320 m. Numerous paratypes are teneral.

Figures

Map 3: Distribution of Nazeris species in eastern Yunnan (N. zhangi lineage: black symbols): N. clavilobatus sp. n. (black circle); N. conicus sp. n. (black square); N. bulbosus sp. n. (black diamond); N. zhangi WATANABE & XIAO (black triangle), N. fibulatus sp. n. (white circle); N. lamellatus sp. n. (white diamond); N. semifissus sp. n. (white triangle).

Figs 46–58: Nazeris fibulatus sp. n. (46–51) and N. bulbosus sp. n. (52–58): forebody (46, 52); male sternite VII (47, 53); male sternite VIII (48, 54); aedeagus in lateral and in ventral view (49–50, 55–56); ventral process of aedeagus in ventral view (51); aedeagus in lateral and in ventral view in dry preparation (57–58). Scale bars: 46, 52: 1.0 mm; 47–50, 53–58: 0.5 mm; 51: 0.2 mm.

Figs 59–75: Nazeris clavilobatus sp. n. (59–67) and N. conicus sp. n. (68–75): forebody (59, 68); tergite VIII (60); male sternite VII (61, 69); male sternite VIII (62, 70–71); aedeagus in lateral and in ventral view (63–64, 72–73); aedeagus in lateral and in ventral view in dry preparation (65–66, 74–75); ventral process of aedeagus in ventral view (67). Scale bars: 59, 68: 1.0 mm; 60–66, 69–75: 0.5 mm; 67: 0.1 mm.