Orsunius discipennis ( FAUVEL 1895) Assing, 2011

Assing, V., 2011, Orsunius gen. nov. from the Oriental region (Coleoptera: Staphylinidae: Paederinae: Medonina), Linzer biologische Beiträge 43 (1), pp. 221-244 : 238-240

Orsunius discipennis ( FAUVEL 1895) , nov.comb. ( Figs 70-76 )

Medon discipennis FAUVEL 1895: 230 .

Medon (Hypomedon) discipennis : CAMERON (1931).

T y p e m a t e r i a l e x a m i n e d Lectotype Ƌ, present designation: "Carin, Asciuii Ghecù, 1400-1500 m, L. Fea. III-IV.88 / discipennis Fvl. / Ex-Typis / I. R. Sc. N. B. / Lectotypus Ƌ Medon discipennis Fauvel , desig. V. Assing 2011 / Orsunius discipennis (Fauvel) , det. V. Assing 2011" (IRSNB). Paralectotype ♀: same data as lectotype (IRSNB).

C o m m e n t: The original description is based on an unspecified number of syntypes from " Birmanie, Carin Asciuii Ghécu, 1400-1500 m " ( FAUVEL 1895). Three syntypes, two males and a female, were located in the Fauvel collection at the IRSNB. They belong to two species. The male that is conspecific with the female is designated as the lectotype. The male of the second species is designated as the holotype of the species described in the following section.

R e d e s c r i p t i o n: Body length 4.3-4.5 mm. Habitus as in Fig. 70 . Coloration: head and pronotum reddish; elytra pale reddish, with the anterior two thirds infuscate, except for the suture and the humeral angles; abdomen dark-reddish; legs and antennae reddish.

Head approximately 1.25 times as broad as long ( Fig. 71 ); punctation coarse and dense, somewhat sparser in posterior median portion of dorsal surface; interstices without microsculpture; lateral margins with numerous long black setae. Eyes large and bulging, slightly longer than postocular portion in dorsal view. Anterior margin of labrum with distinct median incision.

Pronotum ( Fig. 71 ) distinctly transverse, 1.20-1.25 times as broad as long and 1.05-1.10 times as wide as head; punctation similar to that of head; midline with rather broad, distinct, and complete impunctate band; margins with numerous long black setae.

Elytra approximately as long as pronotum ( Fig. 71 ); punctation very fine and dense. Hind wings present and apparently fully developed. Tarsi moderately short; protarsomeres I-IV distinctly dilated; metatarsomere I slightly shorter than the combined length of II and III.

Abdomen with fine, moderately dense punctation and with moderately pronounced microsculpture; posterior margin of tergite VII with palisade fringe.

Ƌ: sternite VII transverse, pubescence not distinctly modified ( Fig. 72 ); sternite VIII with truncate posterior margin ( Fig. 73 ); aedeagus 0.83 mm long and with long asymmetric ventral process of distinctive shape ( Figs 74-76 ).

C o m p a r a t i v e n o t e s: In external and the male sexual characters, O. discipennis is extremely similar to O. wunderlei , from which it is distinguished only by the less pronounced microsculpture and less dense punctation of the abdomen, as well as by the different shape of the ventral process of the aedeagus.

D i s t r i b u t i o n a n d n a t u r a l h i s t o r y: This species has become known only from the type locality in Burma, where it was collected at an altitude of 1400-1500 m during the period from March through April.

Figures

Figs 70-76: Orsunius discipennis (FAUVEL), lectotype: (70) habitus; (71) forebody; (72) male sternite VII; (73) male sternite VIII; (74-75) aedeagus in lateral and in ventral view; (76) apex of ventral process of aedeagus in lateral view. Scale bars: 70-71: 1.0 mm; 72-75: 0.2 mm; 76: 0.1 mm.