Lasinus yakushimanus, 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 : 36-37

Lasinus yakushimanus sp. n. Figs 7, 10, 16, 26

Type material.

(8 ♂♂, 7 ♀♀). HOLOTYPE, ♂, labelled as follows: (p) [Japan, Kyushu, Kagoshima Pref., Yakushima, Hananoegô, 17.III.2001, H. Hoshina leg.] red label (p) HOLOTYPE Lasinus yakushimanus sp. n., Bekchiev, Hlaváč & Nomura det., 2013 (NSMT). PARATYPES: (6 ♂♂, 3 ♀♀) same data as holotype; (1 ♂, 3♀♀) Japan, Kagoshima Pref., Yakushima, Mt. Nonkidake, 1350 m, 4.IX.2006, S. Nomura leg.; (1♀) Japan, Kagoshima Pref., Yakushima, Mt. Aikodake, 200 m, 5.IX.2006, S. Nomura leg. (NSMT, PCPH, NMNH, PCSK).

Description.

Body unicoloured, reddish-brown, maxillary palpi yellow dark, length 2.84-2.96 mm.

Head elongate, about 1.07-1.11 times longer than wide and about as long as pronotum; median sulcus visible on rostrum and on vertex reaching level of vertexal foveae. Genae with weak protuberance, covered with erected, dense golden setae (Fig. 7).

Antennae about 1.94 mm long (Fig. 16); scapes long, about 3.0 times longer than pedicels; pedicels as long as antennomeres III; antennomeres IV and V slightly longer than wide; antennomeres VI 1.62 times longer than wide; antennomeres VII as long as wide; antennomeres VIII as long as and slightly wider than VII; IX about 1.20 times longer than wide, in male with shallow ventral excavation on apical half terminating with small nail-shaped protuberance, in female unmodified; antennomeres X 1.21 longer than wide; terminal antennomeres about 1.27 times longer than wide.

Pronotum about as wide as long, wrinkly, with weak lateral swellings before lateral foveae (Fig. 10); lateral and median setose foveae well-defined; median sulcus thin.

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

Abdomen slightly wider than elytra; first visible abdominal tergite (IV) finely punctate, with dense, very short golden setae; carinae short, distance between carinae 0.49 of maximal tergal width. Aedeagus (Fig. 26) 0.56 mm long; median lobe weakly narrowed apically, with short and large apical lobe; endophallus with two spines; ventral spine large, forming narrow curved plate; dorsal spine slender, evenly curved, acute at apex; parameres long, overlapping apical lobe, enlarged at apex.

Differential diagnosis.

Lasinus yakushimanus is close to Lasinus okinawanus by sharing the presence of weak lateral swelling on the pronotum, and to Lasinus monticola by the presence of a nail-shaped protuberance on antennomeres IX, it differs from both by the shapes of the antennae and the aedeagus.

Etymology.

The name is associated with the name of the locality, Yakushima, where the speciments was found.

Distribution.

Japan (Yaku-shima Island).