Sinotrisus vietnamensis Yin & Nomura

Yin, Zi-Wei, Nomura, Shuhei & Li, Li-Zhen, 2012, A taxonomic revision of the genus Sinotrisus Yin & Li (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 205, pp. 45-57 : 53-55

Sinotrisus vietnamensis Yin & Nomura sp. n. Figs 4B, 6

Type material.

Holotype, male, labeled 'Mt. Phang Si Pang (moss: / 2,000 m). Lai Chau Prov. / [N. VIETNAM] / 17.v.2003, S. Nomura leg. // HOLOTYPE [red] / Sinotrisus vietnamensis sp. n. / Yin and Nomura / det. 2012, NSMT’.

Diagnosis.

Vertex modified in male. Antennomeres VII greatly transverse. Pronotum lacking spines along discal ridges; basolateral foveae small. Mesotibiae with apical spur about as long as first tarsomeres.

Description.

Male (Fig. 4B). Length 3.00. Head (Fig. 6A) distinctly wider than long, HL 0.57, HW 0.71; frons convex medially, extending posteriorly to anterior mar gin of vertexal cavity; shallow transverse cavity with large foveae, area posterior to cavity strongly raised medially to form rostrum, densely covered with setae; with distinct occipital carinae; postocular margins evenly narrowed toward head base; antennomeres IV (Fig. 6B) about same length as VI, clubs formed by apical three antennomeres, IX strongly transverse, X slightly longer than IX, XI nearly oval, narrowed toward apex in apical half. Pronotum about as long as wide, PL 0.63, PW 0.65; median longitudinal sulcus slightly widened posteriorly to form shallow oval antebasal impression, lacking median antebasal fovea; paranotal carinae extending through length of prosternum. Elytra slightly wider than long, EL 0.92, EW 1.13; barely angulate at humeri. Mesotrochanters (Fig. 6C) with long basoventral spine; mesotibiae with apical spur (Fig. 5D) about same length of first tarsomeres; metatrochanters (Fig. 6E) broadly expanded ventrally, with small blunt tubercle at ventral margin. Abdomen slightly wider than long, AL 0.88, AW 1.10; segments lacking basal ridges. Aedeagus (Figs 6 F–I) well-sclerotized, length 0.39.

Female. Unknown.

Distribution.

Vietnam: Lai Chau.

Habitat.

The individual was collected from a pile of moist moss.

Etymology.

Named after the country where the type locality lies.