Lasinus mikado, 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 : 32-33

Lasinus mikado sp. n. Figs 5, 13, 23

Lasinus spinosus Sharp: Jeannel 1958: 121-122; figs 146, 147, 148.

Lasinus spinosus Sharp: Sawada 1961: 41; pl. 7, figs 5, 6.

Type material

(14 ♂♂, 17 ♀♀). HOLOTYPE, ♂, labelled as follows: (p) [Japan, Miyanoshita, Lewis], red label (p) HOLOTYPE Lasinus mikado sp. n., Bekchiev, Hlaváč & Nomura det., 2013. (BMNH); PARATYPES (2 ♂♂, 1♀): Japan, Nanatsukahara, Shobara City, Hiroshima Pref., 10.X.1987, I. Okamoto leg.; (1 ♂) Japan, Honshu, Chiyoda-ku, Tokyo Pref., Fukiage Gyoen, Imperial palace, 19.I.2001, S. Nomura leg.; (1 ♂) same data, 8.V.2001; (1 ♀) 18.XII.2003; (2 ♀♀) 2.II.2004; (3 ♀♀) 12.II.2007; (1 ♂) Japan, Honshu, Fussa-shi, Tokyo Pref., Tamagawa riverside, Mutsumi-bashi, 12.II.2007, S. Nomura leg.; (1 ♂) Japan, Honshu, Akiu-machi, Miyagi Pref., Futakuchi Valley, 27.VII.1990, S. Nomura leg.; (3 ♂♂, 1 ♀) Japan, Honshu, Saitama Pref., Ranzan-machi, Kagamata, 5.IV.1996, K. Toyoda leg.; (1 ♂) Japan, Honshu, Chiba Pref., Kôzaki-jinja, Kôzaki-machi, 14.X.2001, S. Nomura leg.; (1 ♂, 2♀♀) Japan, Honshu, Niiharu-mura, Gunma Pref., Hôshi-onsen, 600 m, 20.X.2001, S. Nomura leg.; (2 ♀♀) Japan, Niigata Pref., Kuroiwa, Shibata, 22.XI.1990, H. Koike leg.; (1 ♂) Japan, Nara, 27-31.VII.1980, C. Besuchet leg.; (1 ♂) Japan, Shikoku, Ishizuchi Mts., Omogo Valley, 700 m, 18-25.VIII.1980, J. Peck leg.; (1 ♂) Japan, Ôhira, Shimamaki-mura, Hokkaido, 4-18. VI. 1994, S. Hori leg.; (1 ♂) Japan, Teshio-gawa, Teshio-chô, Hokkaido, 22. VII. 1992, S. Hori leg.; (4 ♂♂, 2 ♀♀) Russia, Kunashir Island, Tretiakovo VIII., 20.VII.1990, S. Kurbatov leg.; (1 ♀) same data, 18.VII.1990; (1 ♂) Japan, 1890, Schönfeldt leg.; (7 ♂♂, 10 ♀♀) Japan, Kanagawa, Sauter leg., (BMNH, NSMT, NHMW, NMNH, MHNG, PCPH, PCSK).

Description.

Body (Fig. 5) unicoloured, reddish-brown, maxillary palpi light brown, length 2.87-3.1 mm.

Head elongate, about 1.10 times longer than wide, slightly longer than pronotum; median sulcus visible on rostrum, on vertex reaching level of vertexal foveae. Genae with weak protuberance, covered with erected, dense golden setae.

Antennae about 2.15 mm long (Fig. 13); scapes long, about 3.4 times longer than pedicels; pedicels about 1.18 times shorter than antennomeres III, antennomeres V and VI as long as pedicels; VII 1.25 times shorter than VI; antennomeres VIII about 1.27 times longer and distinctly wider than VII; antennomeres IX about 1.5 times longer than wide, about the same length as terminal antennomeres, in male with deep ventral concavity on apical half terminating with nail-shaped protuberance, in female unmodified; antennomere X quadrate, 1.5 times shorter than IX; terminal antennomeres 1.6 times as long as X and about 1.5 times longer than wide.

Pronotum about as wide as long, wrinkly, evenly rounded before lateral foveae; lateral and median setose foveae well-defined; median sulcus thin.

Legs long and slender; protrochanters with large apical spine; profemora with long spine in middle of its length; mesotrochanters at apex with two minuscule (male) or two strong (female) and one minuscule spine; 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, about 4 times longer than second visible tergite (V); basal carinae very short, distance between carinae 0.53 of maximal tergal width. Aedeagus (Fig. 23) 0.61 mm long; median lobe weakly narrowed apically, with long and relatively narrow apical lobe; endophallus with one bifid spine and two small lamellas; lamellas finely dentate on the apical part; parameres long, overlapping apical lobe, enlarged at apex.

Differential diagnosis.

Lasinus mikado is close to Lasinus monticola and Lasinus yakushimanus by the presence of a nail-shaped protuberance on antennomeres IX, it differs from both by the presence of a deep concavity on antennomeres IX and by the shape of aedeagus.

Etymology.

The name is derived from the Japanese word - „mikado“, meaning the Emperor of Japan.

Distribution.

Japan (Hokkaido, Honshu, Shikoku), Russia (Kuril Islands).

Remarks.

The original type series of Lasinus spinosus in the Sharp collection is in fact a mix of Lasinus spinosus and Lasinus mikado sp. n.