Lasinus inexpectatus, Bekchiev, Rostislav, Hlavac, Peter & Nomura, Shuhei, 2013

Bekchiev, Rostislav, Hlavac, Peter & Nomura, Shuhei, 2013, A taxonomic revision of Tyrini of the Oriental region. V. Revision of the genus Lasinus Sharp, 1874 (Coleoptera, Staphylinidae, Pselaphinae), ZooKeys 340, pp. 21-42 : 35-36

Lasinus inexpectatus sp. n. Figs 15, 25

Type material

(3 ♂♂, 1♀). HOLOTYPE, ♂, labelled as follows: (p) Japan, Kyushu, Miyazaki Pref., Aya-chô, Ôtsuribashi, 25.IV.1993, leg. S. Nomura. red label (p) HOLOTYPE, Lasinus inexpectatus sp. n., Bekchiev, Hlaváč & Nomura det. 2013 (NSMT). PARATYPES, (2 ♂♂, 1♀): 1 ♂, 1 ♀, same data as holotype, 1 ♂: (p) Japan, Kyushu, Miyazaki Pref., Nangoh-choh, Ohshima (3), leg. Atsushi Nagai (NSMT, NMNH, PCPH).

Description.

Body unicoloured, reddish-brown, elytra slightly lighter, maxillary palpi light brown, length 2.80-3.20 mm.

Head about 1.05 longer than wide, and as long as pronotum; median sulcus very weakly-defined, slightly visible only on rostrum, absent on vertex. Genae with weak protuberance, covered with erected, dense golden setae.

Antennae 2.20-2.24 mm long (Fig. 15); scapes long, about 3.25 times longer than pedicels; pedicels slightly shorter than antennomeres III–VII combined, which are subequal; VIII slightly longer and about 1.30 times wider than VII; antennomeres IX rectangular, simple, in male slightly shorter (0.18 mm) than in the female (0.24 mm); X about as wide as long; terminal antennomeres 1.60 times longer than X.

Pronotum 1.05 times longer than wide, wrinkly, evenly rounded before lateral foveae; lateral and median setose foveae well-defined; median sulcus thin, present only on disc.

Legs long and slender; protrochanters with large apical spine; profemora with long spine in middle of its length; mesotrochanters at apex with one minuscule (male) or two strong (female) spines; mesofemora with minuscule spine at basal third.

Abdomen slightly wider than elytra; first visible abdominal tergite (IV) finely punctate with dense and long golden setae on sides, disc glabrous, about 3 times longer than second visible tergite (V); basal carinae very short, almost invisible in males. Aedeagus (Fig. 25) 0.63 mm long; median lobe weakly narrowed apically, with long and narrow apical lobe; endophallus with three spines and small lamella; ventral spine large, forming large plate, acute and curved at apex; dorsal spine large, curved, acute at apex; lateral spine very slender and small, acute at the apex; lamella small, finely dentate on apical part; parameres short, unequal in length, not overlapping apical lobe, enlarged at apex.

Differential diagnosis.

Lasinus inexpectatus is close to Lasinus sinicus due to the simple antennomeres IX lacking any sexual character. The two species can be separated by the absence of swellings before lateral foveae on the pronotum in Lasinus inexpectatus . From all other Japanese species, Lasinus inexpectatus also differs by the shapes of the aedeagus and the antennae.

Etymology.

The name is realated with the „unexpected” discovery of this species.

Distribution.

Japan (Kyushu).