Osorius ater PERTY, 1830

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 : 376-377

Osorius ater PERTY ,, 1830: 30 ( Figs 1 a-d)

Type material examined:

The two type specimens without any information on locality or collector are deposited in ZSM; one is labelled Osorius ater , the other is without label. According to information of the curator Dr. M. Baehr, both specimens are from Perty’s collection. The one with label Osorius ater is fixed as lectotype.

Additional material examined:

Brazil: Rio de Janeiro (43°14' W, 22°49' S), with many other labels 2 specimens coll. Fermaire ( IRSNB) ; Rio de Janeiro, coll. Camille van Voxem, 3 specimens ( IRSNB) ; Rio de Janeiro with additional label Paraná, Minas Gerais, Caracai, 1.2.1885 leg. E. Gounelle; Bartacéna, coll C. van Voxem 1 specimen ( IRSNB) ; Rio de Janeiro, Fry coll. 4 specimens ; Rio de Janeiro, Corcovado , leg. Bryant, 17.12.1912, 2 specimens ( BMNH) ; Rio de Janeiro, Corcovado , 1 specimen, 7.11.1963, B. Wygodzinski ( AMNH) ; Magé , 70 km N Rio de Janeiro 2 specimens, 10.11.1999, leg. W. Grosser ( JC) ; São Paulo, Piracicaba, Steel coll., 2 specimens ( BMNH) ; Rio de Janeiro, 9 specimens, leg. Reinhardt ( ZMUK) ; São Paulo, Piracicaba, Mata de Escola Superior Agricola Luiz der Queiroz , 01.05.1962, leg. J. Becker, 7 specimens ( UIC) ; São Paulo, Serra Bocaina , 1650 m elevation, 1 specimen, 1.11.1969, leg. M. Alvarenga ( AMNH) ; Espiritu Santo, 2 specimens, coll. Sharp, 4 specimens, coll. Cameron ( BMNH) ; Santa Catharina, Fry coll. ( BMNH) ; Brazil without further data 1 specimen ( IRSNB) ; Petropolis 1 specimen ( IRSNB) , Theresopolis 1 specimen; Piquete, D. Morcina , 1500 m elevation, 1.12.1957, leg. H. Schubart ( UIC) ; Serra de Bocaima , 1 specimen, 15.4.1961, leg. H. Nobregasd ( UIC) ; Pinhal Grande (50°13' W, 30°15' S), 1 specimen, 15.12.1947 and 15.1.1948, leg. A. Maller ( AMNH) ; Corupa (49°13' W, 26°26' S), Hansa Humboldt , 3 specimens, 15.10.1948 and 15.11.1948, leg. A. Maller ( AMNH) ; Rolandia (51°22' W, 23°18' S), 2 specimens, 15.10.1947, leg. A. Maller ( AMNH) ; Santa Catharina, Cauna , 1 specimen, 15.11.1948, leg. A. Maller ( AMNH) ; Nova Teutonia (52°23'' W, 27°11' S), 1 specimen, 15.12.1946, leg. F. Plaumann ( AMNH) ; 2 specimens, Jan. 1938 and Sept. 1939, leg. F. Plaumann ( MS) ; Lages, South Brazil , 4 specimens, 15.11.1948 ( AMNH) ; Rio Grande do Sul, Represa, Guanabara , 1 specimen, 15.9.1969, leg. F.M. Oliveira ( AMNH) ; Parana, 1 specimen, 15.10.1900, leg. B. Pohl ( AMNH) ; Espirito Santo (40°12' W, 20°05 ' S), 2 specimens, 12.9.1914, leg. Hauschild ( ZMUK) ; Lagoa Santa (43°54' W, 19°38 ' S), Minas Gerais, 12 specimens, leg. Reinhard ( ZMUK) ; Minas Gerais, 2 specimens, leg. Reinhardt ( ZMUK) ; Brazil , 2 specimens, leg. R.H. Stamm repectively leg. Westermann ( ZMUK) ; Argentina: Ipiranga and Monte des Ozuges near Rio Missiones , 1 specimen ( IRSNB) ; Paraguay: without further data, 1 specimen, leg. Hauschild ( ZMUK) .

Diagnosis:

The clypeus with a pair of long and strong prominent teeth is unique in the Neotropical Osorius species. Clypeal teeth are found in some other species, but distinctly shorter and narrower.

Description:

Length: between 13.5 and 17.0 mm. Colour: totally black.

Head :: 3.0 mm long, 3.0 mm wide; distinctly and moderately sparse punctation; on average distance between punctures slightly wider than diameter; microsculpture distinct; netlike reticulate; surface scarcely shiny; anterior edge with a pair of long prominent teeth; in lateral aspect; anterior edge in front of eyes and lower dorsal edge forming a more or less rectangular angle; edge in front of eyes with four granular setiferous punctures; a supraocular area with seven granular punctures; on disc with four setae.

Antennae: antennomeres 4 to 10 more or less quadrate.

Pronotum: 2.5 mm long, 3.2 mm wide; widest at anterior angles; sides distinctly narrowed to the posterior angles; in front of posterior angles with short slight emargination; posterior angles forming a rectangular angle; surface sparsely punctate; distance between punctures on average more than twice as wide than diameter; microsculpture similar as on head; netlike reticulate; surface scarcely shiny; prosternum with ventral prominence at anterior edge.

Elytra: 2.0 mm long, 3.1 mm wide; with relatively large and dense punctures; distance between punctures not wider than diameter of punctures; surface slightly shiny; ground sculpture coriaceous; metanotum without setae.

AedeagusAedeagus with a very short apical part ending in an obtuse apex.

Figures

Fig. 1: Osorius ater. - Fig. 2: O. stipes. - Fig. 3: O. alternansalternans (a: front body, b: antenna, c: aedeagus in ventral and lateral aspect, d: clypeus with labrum, e: head in lateral aspect; scale bar a, b: 1 mm, c, d, e: 0.5 mm).