Lathrobium horridum, Assing, 2013

Assing, V., 2013, On the Lathrobium fauna of Japan (Coleoptera: Staphylinidae: Paederinae), Linzer biologische Beiträge 45 (1), pp. 1615-1641 : 1628-1630

Lathrobium horridum nov.sp. ( Figs 30-35 )

T y p e m a t e r i a l Holotype 3: " JAPAN Kyushu, Fukuoka Dazaifu, Mt. Houmanzan, 15.v.06 T. Lackner / Holotypus 3 Lathrobium horridum sp.n., det. V. Assing 2013" (cRou). Paratypes: 13, 1♀: same data as holotype (cAss).

E t y m o l o g y: The specific epithet (Latin, adjective: simple) refers to the weakly modified male sternites VII and VIII.

D e s c r i p t i o n: Species of moderate size; body length 6.7-8.0 mm; length of forebody 3.1-3.2 mm. Coloration: head blackish; pronotum dark-brown; elyra brown; abdomen dark-brown, with posterior margin of segment VII and posterior portion of segment VIII paler; legs reddish; antennae dark-reddish to reddish-brown.

Head ( Fig. 30 ) transverse, 1.06-1.10 times as broad as long, weakly dilated posteriad; punctation sparse and moderately coarse; interstices with fine and shallow microreticulation, much broader than diameter of pumctures. Eyes approximately half as long as postocular region in dorsal view, or nearly so, weakly convex, and composed of approximately 50 ommatidia. Antenna 2.2 mm long.

Pronotum ( Fig. 30 ) 1.16-1.18 times as long as broad and and approximately 1.08 times as broad as head; lateral margins subparallel in dorsal view; punctation similar to that of head; interstices without microsculpture; impunctate median band moderately broad.

Elytra ( Fig. 30 ) approximately 0.57 times as long as pronotum, weakly dilated posteriad; punctation rather fine, defined, and moderately sparse. Hind wings completely reduced.

Abdomen approximately 1.08 times as broad as elytra; punctation fine and dense, nearly as dense on tergite VII as on anterior tergites; interstices with fine and shallow microcsculpture; posterior margin of tergite VII without palisade fringe; posterior margin of tergite VIII weakly convex in both sexes.

3: protarsomeres I-IV strongly dilated; sternites III-VI unmodified; sternite VII ( Fig. 31 ) moderately transverse and with shallowly concave posterior margin, pubescence not distinctly modified; sternite VIII ( Fig. 32 ) weakly oblong and weakly modified, posterior margin weakly concave in the middle, pubescence unmodified; aedeagus ( Fig. 33 ) 1.4 mm long and symmetric; ventral process conspicuously long and slender, apical portion straight; dorsal plate with distinctly sclerotized, long, apically very acute, and nearly flat apical portion, and with short membranous basal portion; internal sac without sclerotized structures.

♀: protarsomeres I-IV moderately dilated, distinctly less so than in male; sternite VIII ( Fig. 34 ) slender, strongly oblong, and with strongly convex posterior margin; tergite IX ( Fig. 35 ) long, slender, undivided in the middle, and with short postero-lateral processes; tergite X ( Fig. 35 ) very small, 0.4 times as long as antero-median portion of tergite IX.

C o m p a r a t i v e n o t e s: Lathrobium horridum is readily distinguished from the other species known from Kyushu by the weakly modified male sternites VII and VIII, as well as by the morphology of the aedeagus, particularly the long and slender ventral process.

D i s t r i b u t i o n: The type locality is situated on the Houmanzan near Dazaifu in Fukuoka Prefecture, northern Kyushu.

Figures

Figs 30-35: Lathrobium horridum nov.sp.: (30) forebody; (31) male sternite VII; (32) male sternite VIII; (33) aedeagus in lateral and in ventral view. Scale bars: 30: 1.0 mm; 31-35: 0.5 mm.