Osorius nitens SHARP , 1876: 382

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 : 393-394

Osorius nitens SHARP, 1876: 382 (Figs 35 a-c)

O. simplex SHARP, 1876: 383 new synonymy

O. latimargo BERNHAUER ,, 1908: 294 new synonymy

Type material examined:

Brazil: Amazonas: São Paulo de Olivença, 1 female without further data (syntype, BMNH); Amazonas, Tefé, 1 female without further data (holotype of O. simlex, BMNH ) ; Peru: without further data, 2 females (syntypes of O. latimargo, FMNH ) .

Additional material examined:

Brazil: Amapa, Sierra do Navio , sob cascas, 1 specimen, 5.12.1959, leg. R. Arlé ( UIC) ; Ecuador: Sucumbios, Sacha Lodge (76°5' W, 0°5' S), leg. Rougemont, 28.10.2004 ( RC, UIC) ; under bark, 270 m elevation, 4 specimens, 22.3.1999, leg. R.W. Brooks ( KU) ; fruit fall, 1 specimen, 23.3.1999, leg. R.W. Brooks ( KU) ; Napo, Jatun Sacha (77°37' W, 1°03' S), 16 km E Puerto Napo, rain forest, litter fall, 420 m elevation, 2 specimens, 27.2.2006 and 22.7.2009, leg. U. Irmler ( UIC) ; 6.9 km E Puerto Napo (77°43' W, 1°01' S), primary forest with sparse understory, shady leaf litter, rotten branches, along trail, 500 m elevation, 1 specimen, 24.11.2006, leg. Fikácek ( NMP) ; Yuturi Lodge (76°02' W, 0°32' S), under bark, 270 m elevation, 1 specimen, 21.3.1999, leg. R.W. Brooks ( KU) ; Sierra Azul, Hazienda Aragon (77°55' W, 0°40' S), flight intercept trap, 2300 m elevation, 1 specimen, 26.3.1996, leg. R.W. Brooks ( KU) ; Archidona (77°49' W, 0°54' S), 2.4 km W, dense lowland vegetation on bank of stony river, wet leaf litter, sifted, 590 m elevation, 2 specimens, 21.11.2006, leg. Fikácek ( NMP) ; Peru: Madre de Dios (71°02' W, 12°20' S) Manu National Park, Cocha Otorongo , 310 m elevation, under bark, leg. R.W. Brooks, 9 specimens, 21.10.2000 ( KU, UIC) ; Pentiacolla Lodge, Monk Saki trail, under bark, 400 m elevation, 1 specimen, 25.10.2000, leg. R.W. Brooks ( KU) ; 2-7 km NW El Mirador trail, under bark, 1 specimen, 24.10.2000, leg. R.W. Brooks ( KU) ; San Ramon (75°17' W, 11°03' S), Estancia Naranjal, 1000 m elevation, leg. B. Wygodzinski, 27.7.1965 ( AMNH) ; Puerto Maldonado (69°12' W, 12°37' S), Reserva Cuzco Amazonica , flight intercept trap, 1 specimen, 22.6.1989, leg. R. Leschen ( KU) ; 15 km NE, under bark, 200 m elevation, 2 specimens, 17.6.1989 and 7.7.1989, leg. R. Leschen ( KU) ; 15 km NE, fungusy log, 2 specimens, 6.7.1989, leg. R. Leschen ( KU) ; Bolivia: Buena Vista, Hotel Flora y Fauna (63°33' W, 17°29' S), Chiquitano forest leaf litter, 420 m elevation, 1 specimen, 5.11.2002, leg. R. Leschen ( KU) .

Diagnosis:

Compared to the similar species in size, the species can be distinguished by the shiny head and the scarcely shiny pronotum, but identification is difficult without genital dissection. Compared to similar species, the more or less circular shape of aedeagus is characterised by the acuminated, apical part with a distal narrow fold.

Description:

Length: 10.0 mm. Colour: black.

Head :: 1.5 mm long, 2.1 mm wide; with distinct but moderately sparse punctation; distance between punctures on average more than two times wider than diameter of punctures; isodiametric microsculpture very weak; surface nearly polished; clypeus with pair of obtuse lateral teeth carrying a long yellow seta on its inner side; labrum nearly two times wider than long; distinctly projecting clypeal front emargination; eyes 1/3 as long as temples; dorsally and behind eyes with several striae; posterior striae pointing ventrally; with several granular supraocular punctures; lateral and ventral microsculpture distinct.

AntennaeAntennae thick; 2 nd antennomere oval; 3 rd one conical and scarcely longer than 2 nd; antennomeres 4 to 6 slightly longer than wide; subsequent antennomeres more or less quadrate.

Pronotum: 1.7 mm long, 2.2 mm wide; widest at acutely prominent front angles; narrowing continuously to posterior angles; lateral margin narrow at anterior angles; slightly wider at posterior angles; posterior edge margined; with coarser punctation than on head; distance between punctures on average as wide as diameter of punctures; a smooth midline impunctate; isodiametric microsculpture deep and much more distinct than on head; surface scarcely shiny.

Elytra: 2.4 mm long, 2.2 mm wide; with deeply coriaceous ground sculpture; punctation not visible between coarse ground sculpture; surface scarcely shiny due to deep ground sculpture.

Aedeagus more or less circular; with moderately long apical part ending in an acute apex; distad with a narrow fold.