Lathrobium damingense Peng

Peng, Zhong, Li, Li-Zhen & Zhao, Mei-Jun, 2013, Two new species and additional records of Lathrobium Gravenhorst (Coleoptera: Staphylinidae: Paederinae) from Guangxi, South China, Zootaxa 3694 (3), pp. 213-220 : 218-220

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Lathrobium damingense Peng


Lathrobium damingense Peng and Li, new species

(Figs 3 C, 5)

Type material. (1 ♂, 2 ♀♀). HOLOTYPE: ♂, labelled ‘ China: Guangxi Prov., Wuming County Mt. Damingshan, 23 ° 23 'N 108 ° 29 'E, alt. 1,500 m 29.vii. 2012, Hu & Song leg.’ (SNUC). PARATYPES: 2 ♀♀, same label data as holotype (SNUC).

Description. Measurements (in mm) and ratios: BL 7.57–9.43, FL 3. 73–4.31, HL 1.00– 1.10, HW 1.10–1.25, PL 1.37–1.55, PW 1.23–1.35, EL 0.67–0.76, AL 1.39, HL/HW 0.88–0.91, HW/PW 0.89–0.93, HL/PL 0.71–0.73, PL/PW 1.11–1.15, EL/PL 0.49–0.50.

Habitus as in Fig. 3 C. Body dark brown with paler apex, legs brown, antennae brown to light brown.

Head weakly transverse, more or less dilated posteriad; punctation coarse and moderately dense, sparser in median dorsal portion; interstices with distinct microreticulation, eyes large, 1 / 3 times as long as postocular region in dorsal view and composed of numerous (> 60) defined ommatidia. Antenna 2.3 mm long.

Pronotum stout, lateral margins conspicuously convex in dorsal view; punctation somewhat sparser than that of head; interstices without microsculpture; impunctate midline moderately broad.

Elytra 0.49–0.50 times as long as pronotum; punctation moderately coarse and dense. Hind wings completely reduced. Protarsi with moderate sexual dimorphism.

Abdomen with fine and dense punctation; interstices with distinct microsculpture; posterior margin of tergite VII without palisade fringe; tergite VIII without appreciable sexual dimorphism, broadly convex posteriorly ( Fig. 5 View FIGURE 5 A).

Male. Sternites III–VI unmodified; sternite VII ( Fig. 5 View FIGURE 5 D) strongly transverse and with very shallow posterior impression, this impression without distinctly modified setae, posterior margin weakly concave in the middle; sternite VIII ( Fig. 5 View FIGURE 5 E) transverse, with shallow postero-median impression, this impression with long setae, posterior margin distinctly concave; sternite IX ( Fig. 5 View FIGURE 5 D) asymmetric; aedeagus as in Figs 5 View FIGURE 5 G, 5 H; ventral process nearly symmetric and tongue-shaped; dorsal plate sclerotized, thin and long; internal sac with membranous structures and usual ring-shaped structure.

Female. Sternite VIII ( Fig. 5 View FIGURE 5 B) oblong, posterior margin convexly produced; tergite IX ( Fig. 5 View FIGURE 5 C) with short antero-median portion and with long postero-lateral processes, median portion with median suture; tergite X ( Fig. 5 View FIGURE 5 C) 5.8 times as long as antero-median portion of tergite IX ( Fig. 5 View FIGURE 5 C).

Comparative notes. This species is readily distinguished from all other Lathrobium species recorded from China by the shape and chaetotaxy of the male sternite VIII, by the shape of the tergites IX–X, and in particular by the distinctive shape and inner structures of the aedeagus. Closer affiliations to any of the described Lathrobium species from China are unclear.

Distribution and biological notes. This species is currently known only from the type locality. The specimens were collected by sifting leaf litter from the floor of a beech forest at an altitude of 1,500 m (Song & Hu, pers. comm.).

Etymology. The species is named after its type locality “Daming Shan”.