Osorius laevigatulus SCHUBERT , 1911: 4

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 : 392

Osorius laevigatulus SCHUBERT, 1911: 4 (Figs 21 a-b)

Type material examined:

Brazil: Paraná, Porto Lucena (55°01' W, 27°51' S), 1 female, without further data (holotype, ZMHU) .

Additional material examined:

Brazil: Paraná, Bituruna Palma (51°34' W, 26°10' S), 1 female, Jan. 1960, leg. V. Stawiarsky ( UIC) ; Ecuador: Sucumbios, Shushufindi (76°38' W, 0°11' S), 1 female, 8.12.2004, leg. P. Banar ( JC) .

Diagnosis:

The species can be easily differentiated from most similar species in size by the total lack of microsculpture on head and pronotum, and by the polished surface. However, it is very similar to O. wasmanniwasmanni in this respect. Pronotum in O. laevigatulus is less narrowed to posterior angles and density of punctation is more varying than in O. wasmanni . Unfortunately, only females could be found in the collections studied.

Description:

Length: 10.8 mm. Colour: black, legs and antennae brown.

Head :: 1.6 mm long, 2.0 mm wide; eyes as long as temples; front edge slightly emarginate; without distinct teeth at outer angles; disc with distinct and moderately dense punctation; distance between punctures partly shorter and partly wider than diameter of punctures; a circular spot with sparser punctation on disc; neck with distinctly denser punctation; with numerous supraocular striae and few granular punctures; surface without microsculpture; polished.

AntennaeAntennae with 2 nd antennomere globular and short; only half as long as conical 3 rd one; subsequent antennomeres 5 and 6 distinctly longer than wide; antennomeres 8 to 10 quadrate.

Pronotum: 1.9 mm long, 2.2 mm wide; widest at anterior edge; sides in front half more or less parallel; distad more strongly narrowed to posterior edge; in front of posterior edge distinctly emarginate; anterior angles distinctly tooth-like prominent; posterior angles obtusely rounded; lateral edge margined; margin widened to posterior angles; posterior edge margined, anterior edge not margined; punctation deep, but moderately dense; distance partly shorter and partly wider than diameter of punctures; in particular at posterior angles, punctation sparser; with deeply longitudinal central furrow, nearly reaching front and posterior edges; additionally, indistinct transverse depressions in anterior and posterior half; surface without microsculpture; polished.

Elytra: 2.4 mm long, 2.3 mm wide; with weak, sparse and irregular punctation; distance between punctures on average much wider than diameter of punctures; surface more or less polished, but less shiny than pronotum as result of irregular coriaceous ground sculpture.

Front tibia with 9 spines at outer edge; 4 apical ones inserting in long teeth; subsequent 3 ones inserting in short teeth and last 2 ones inserting directly in outer edge.