Osorius sahlbergi BERNHAUER

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 : 400-401

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

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scientific name

Osorius sahlbergi BERNHAUER


Osorius sahlbergi BERNHAUER ,, 1920: 137 (Figs 31 a-c)

Type material examined:

Brazil: Rio de Janeiro, Petropolis (43°10' W, 22°31' S), 2 males, 1 female, Dec. 1850, leg. Sahlberg (syntypes, FMNH) GoogleMaps .

Additional material examined:

Brazil: without further data ( IRSNB) ; Rio de Janeiro (43°14' W, 22°49' S), Caminho do Bico do Papagaio , 3 specimens, 16.12.1959, leg. H. Schubart ( UIC) GoogleMaps ; Rio de Janeiro, 1 specimen without further data ( IRSNB) ; Floresta da Tijuca , 1 specimen, 17.3.1962, leg. Th. Becker ( UIC) ; Itatiaia (43°43' W, 22°42' S), E. of GoogleMaps Rio de Janeiro, 1 specimen, 6.7.1961, leg. O. Mielke ( UIC) ; Minas Gerais, Piquete (45°10' W, 22°36' S), D. Morcina, 1500 m elevation, 2 specimens, 1.10.1957, leg. R. Arlé GoogleMaps ; 1 specimen, 5.1.1960, leg. R. Arlé and Schubart, H. ( UIC) ; São Paulo, Campos de Jordão , 103 specimens, 15.7.1957, leg. K. Lenko ( AMNH) .


The species is characterised by the prominent lateral angles of the clypeus, which are similar to those in O. ater . O. sahlbergisahlbergi is distinctly smaller, and lateral teeth of clypeus less prominent and more obtuse at apex. The aedeagus is characterised by the obtuse emarginate apex that is similar to the aedeagus of O. ashei , but the apical part of the aedeagus in O. asheiashei is longer than in O. sahlbergi .


Length: 10.5 – 11.0 mm. Colour: black. Head :: 2.0 mm, 2.2 mm wide; punctation distinct, distance between punctures as wide as or shortly wider than diameter of punctures; with isodiametric microsculpture; surface slightly shiny; clypeus with distinctly prominent front angles; more or less obtuse at apex, at inner side of lateral prominences with a long seta; labrum slightly emarginate in centre; not projecting clypeal emargination; disc at antennal base shiny; eyes relatively large; nearly as long as temples; few postocular striae and granular punctures.

AntennaeAntennae with 2 nd antennomere short, as long as wide; 3 rd conical and slightly longer than 2 nd; antennomeres 4 to 6 slightly longer than wide; subsequent antennomeres quadrate.

Pronotum: 1.9 mm long, 2.3 mm wide; punctation and microsculpture similar to head; with a short, longitudinally depressed midline; widest at front angles; continuously narrowed to posterior angles; front angles acute with a prominent tooth; lateral margin narrow at front angles, distad widened to posterior angles; front edge without margin, posterior edge with distinct margin.

Elytra: 2.5 mm long, 2.3 mm wide; surface shiny, with deep and sparse punctures, surface coriaceously sculptured.

AedeagusAedeagus pear-shaped with short and broad apical part ending in a flattened concave apex.


Field Museum of Natural History


Institut Royal des Sciences Naturelles de Belgique


American Museum of Natural History