Osorius ashei, Irmler, 2010

Irmler, Ulrich, 2010, The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 363-426 : 375-376

Osorius ashei sp. n. ( Figs 20 a-d, 37 A)

Type material:

Holotype, male: Costa Rica: Puntarenas, Las Cruzes Biol. Stat. (08°47. 14 ' N, 82°57.58' W), 1330 m elevation, 28.-30.V.2004, leg. J.S. Ashe, Z. Falin, I. Hinojosa, collected by flight intercept trap, #CR1AFH04 059 ( KU).

Diagnosis:

The species resembles O. peruvianusperuvianus in the overall shape, but the pronotum is without a trace of microsculpture. In this respect it is similar to O. laevigatulus . O. laevigatuluslaevigatulus can be differentiated from O. ashei by the numerous supraocular striae which are absent in O. ashei . Furthermore, pronotal punctation in O. asheiashei is more distinct and seems denser than in O. laevigatulus . The shape of the aedeagus in O. ashei is unique by the plate-like apex and can not be confused with any other OsoriusOsorius species.

Description:

Length: 10.5 mm. Colour: black.

Head :: 1.5 mm long, 2.1 mm wide; eyes not prominent, slightly shorter than temples; front edge of clypeus with broad lateral prominences divided by a small gap and a seta inserting in gap; in emargination between lateral prominences; a broad semi-circular prominence; punctation deep and dense; distance between punctures on average as wide as to half as wide as diameter of punctures; on small spaces at base of antennae without or with sparse punctation; few short postocular striae and several granular punctures on a supraocular space; one granular puncture setiferous; microsculpture absent or very weakly developed on supraocular space.

AntennaeAntennae with 2 nd antennomere short and globular, 3 rd antennomere at least twice as long as 2 nd; subsequent antennomeres increasing in width; antennomeres 4 to 6 longer than wide; penultimate antennomeres more or less quadrate.

Pronotum: 1.9 mm long, 1.9 mm wide; widest at tooth-like prominent anterior angles; sides slightly narrowed in anterior half; more strongly narrowed in posterior half; a smooth emargination in front of posterior angles; lateral margin small in anterior half; distinctly widened in posterior half; punctation deep and dense; distance between punctures on average as wide as diameter of punctures; on small spaces in front of posterior angles or in midline with sparser or even absent punctation; distinct micro-punctation between coarse punctures, without microsculpture; surface polished; only near posterior angles with distinct netlike microsculpture; surface there matte.

Elytra: 2.4 mm long, 2.4 mm wide; with coriaceous ground sculpture and deep and dense punctation in ground sculpture visible.

Aedeagus relatively broad with short apical part; apex extremely broad ending in a more transparent platform compared to the basal part.

Etymology:

The species is dedicated to my dear colleague Prof. J. Ashe† who found this species during his intensive research in Costa Rica.

Figures

Fig. 20: O. ashei. - Fig. 21: O. laevigatulus. - Fig. 22: O. wasmanni. - Fig. 23: Osorius peruvianusperuvianus (a: front body, b: antenna, c: aedeagus in ventral and lateral aspect, d: clypeus; scale bar: a, b, d: 1 mm, c: 0.5 mm).