Archiclaviger Heller, 1936

Yin, Zi-Wei, Hlaváč, Peter & Cuccodoro, Giulio, 2020, The first record of Archiclaviger in continental Asia, with description of a new species from China (Coleoptera: Staphylinidae: Pselaphinae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 537-544 : 539

Archiclaviger Heller, 1936

Chinese common name: Ŝ寡Ṫȃmh

Archiclaviger Heller, 1936: 66 .

Type species. Archiclaviger overbecki Heller, 1936 (by original monotypy).

Revised diagnosis. Small clavigerite beetles with body size slightly over 2.0 mm. Body moderately convex dorso-ventrally. Head elongate, sub-rectangular, with small, moderately separated asetose vertexal foveae; gular region impressed around small and asetose posterior tentorial pits (gular foveae). Each antenna composed of six antennomeres; antennal fossae entirely and scapes largely covered by rostrum in dorsal view, but can be clearly observed in frontoventral view ( Fig. 1D ); antennomeres 1 (scape) and 2 (pedicel) short, antennomeres 3 to 6 each distinctly longer than pedicel, apex of antennomere 6 truncate, filled with dense, thick setae. Pronotum sub-globose, transverse, broadest near middle, with lateral antebasal foveae and median longitudinal sulcus/impression. Prosternum with shallow lateral procoxal foveae; anterior margin of coxal cavities slightly carinate. Elytra roundly trapezoidal; each elytron with oblique anterior margin; lacking basal foveae, sutural striae complete, lacking obvious discal striae; posterolateral corners obliquely truncate; posterior margin slightly curved; disc covered with short and evenly distributed setae, posterior margin lacking trichomes, with sparse or dense long setae. Mesoventrite strongly protuberant in middle, transverse, confluent with metaventrite, the latter strongly convex in middle and evenly sloping laterally; both meso- and metaventrite with linear microsculpture. Legs short, tibiae straight, narrow at bases and thickening distally.Abdomen dorso-ventrally rounded, disc strongly to moderately convex; composite tergite deeply concave at base, lacking trichomes in cavity; with three pairs of paratergites, both paratergites of first pair bearing well-developed trichome. Sternite 2 (IV) approximately twice length of sternite 1 (III) along midline, as long (in A. overbecki ) as to 1.35 times longer (in A. gaofani sp. nov.) than sternite 3 (V).

Sexual dimorphism. The male of A. gaofani sp. nov. described below possesses a large, curved spine on mesofemur, and a preapical spur on mesotibia. Only a single female is known for A. overbecki , hence the condition of sexual dimorphism of this species remains unknown.

Distribution. China (Jiangsu), Indonesia (Java).

Figures

Fig. 1. Archiclaviger gaofani sp. nov. A–C – habitus (A – dorsal, male; B – lateral, male; C – dorsal, female); D – frontoventral view of antennal bases, showing antennal fossae and scapes.Abbreviations: a1–3 = antennomere 1–3. Scale bars: 0.5 mm in A–C; 0.2 mm in D.