Orsunius flavovirgatus, Assing, 2014

Assing, V., 2014, On Orsunius II. Eight new species and additional records (Coleoptera: Staphylinidae: Paederinae: Medonina), Linzer biologische Beiträge 46 (1), pp. 461-479 : 471

Orsunius flavovirgatus nov.sp.

( Figs 22-25 , 34-35 , Map 2 )

Type material Holotype: " Thailand, 23.-25.ii.1996, Ranong prov. 9°56' 98°40', Ranong: Hot Springs , K. Majer leg. / Holotypus Orsunius flavovirgatus sp.n. det. V. Assing 2013" ( NHMB) . Paratypes: 4, 1: same data as holotype ( NHMB, cAss).

Etymology: The specific epithet is an adjective composed of the Latin adjectives flavus (yellow) and virgatus (striped). It alludes to the coloration of the elytra.

Description: Body length 3.0- 3.6 mm; length of forebody 1.8-2.1 mm. Habitus as in Fig. 22 . Coloration: head and pronotum blackish-brown to blackish; elytra distinctly bicoloured, blackish-brown with the anterior margins, the humeral angles, and the posterior fourth bright yellowish; abdomen dark-brown to blackish-brown, with the posterior portions of segments VII and VIII yellowish; legs and antennae yellowish.

Head ( Fig. 23 ) strongly transverse, 1.15-1.20 times as broad as long, broadest across eyes and with moderately marked posterior angles; lateral margins behind eyes subparallel; posterior margin not distinctly concave in the middle; punctation moderately dense and coarse in anterior half, fine and sparse in posterior half of dorsal surface; interstices without microsculpture; lateral margins without long black setae. Eyes large and strongly bulging, distinctly longer than postocular portion in dorsal view. Antennae approximately 1.0 mm long; antennomeres VII-X transverse. Anterior margin of labrum with Ushaped excision in the middle.

Pronotum ( Fig. 23 ) approximately 1.15 times as wide as long and 0.95 times as broad as head, noticeably tapering posteriad; posterior angles rounded, weakly marked; lateral margins without long black setae; punctation very sparse and fine; midline with broad impunctate band; interstices without microsculpture.

Elytra ( Fig. 23 ) approximately 1.05 times as long as pronotum; punctation dense and fine; interstices without microsculpture. Hind wings fully developed. Protarsomeres I-IV distinctly dilated. Metatarsomere I moderately slender, longer than II, but somewhat shorter than the combined length of II and III.

Abdomen slightly narrower than elytra; punctation dense and fine; interstices with distinct isodiametric microreticulation; posterior margin of tergite VII with palisade fringe.

: sternite VII with weakly concave posterior margin; sternite VIII ( Fig. 34 ) weakly oblong and with shallow, broadly V-shaped posterior excision ( Fig. 35 ); aedeagus ( Figs 24-25 ) small, 0.35 mm long, ventral process relatively short and stout.

Comparative notes: Aside from the male sexual characters, O. flavovirgatus is distinguished from other Orsunius species particularly by the coloration and by the distinctive punctation of the head and pronotum.

Distribution and natural history: The type locality( Map2 )and other data are identical to those of O. latexcisus .

Figures

Map 2: Distributions of Orsunius gladiator (white and black circles), O. latexcisus (black circle), O. flavovirgatus (black circle), O. heissi (black star), O. stimulans (black and grey triangles), O. granulosus (white and grey triangles), O. cuneatus (white diamond), and O. spathulatus (black square).

Figs 18-25: Orsunius latexcisus nov.sp. (18-21) and O. flavovirgatus nov.sp. (22-25): (18, 22) habitus; (19, 23) forebody; (20, 24) aedeagus in lateral view; (21, 25) aedeagus in ventral view. Scale bars: 18-19, 22-23: 1.0 mm; 20-21, 24-25: 0.2 mm.

Figs 26-35: Orsunius granulosus nov.sp. (26-32), O. latexcisus nov.sp. (33) and O. flavovirgatus nov.sp. (34-35): (26) habitus; (27) forebody; (28) male sternite VII; (29, 33, 34) male sternite VIII; (30, 35) posterior portion of male sternite VIII; (31) aedeagus in lateral view; (32) aedeagus in ventral view. Scale bars: 26-27: 1.0 mm; 28-29, 31-34: 0.2 mm; 30, 35: 0.1 mm.