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

publication ID

https://doi.org/ 10.21248/contrib.entomol.60.2.363-426

persistent identifier


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scientific name

Osorius ashei

sp. n.

Osorius ashei sp. n. ( Figs 20 View Fig 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). GoogleMaps


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.


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.


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


Biodiversity Institute, University of Kansas