Osoriellus oculatus Irmler 2014, new combination
Creators: name: Irmler, Ulrich
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Osoriellus
Osoriellus oculatus

description: Osoriellus oculatus (SHARP, 1876) new combination (Figs 7 A-D, 11C)
Osorius oculatus SHARP, 1876: 386
Type material examined: Brazil: Tefé (64°41'W, 3°21'S), without further data (holotype BMNH).
Further material examined: Brazil: Mato Grosso, Cáceres (54°42'W, 16°03'S), 3 females, 7 males, 2./ 4.12.1955, leg. M. Alvarenga (UIC).
Diagnosis: Within the O.- oculatus -group, the species is characterised by its prominent eyes and the 3 short teeth on each side of the middle at anterior edge of the clypeus. The punctation of the pronotum is similar as in O. hanagarthi, but the shape of the pronotum is different. In O. oculatus, the pronotum is more deeply sinuated shortly in front of the posterior angles than in O. hanagarthi. The aedeagi are very similar in O. oculatus and O. hanagarthi, but the apex of the aedeagus in O. hanagarthi is obtuse, whereas it is acute O. oculatus.
Description: Length: 4.2 – 4.7 mm. Colouration: Dark brown; legs and antennae reddish.
Head: 0.60 mm long, 0.85 mm wide: with large and prominent eyes; eyes at least half as long as temples; angles of clypeus produced to short teeth; adjacent to tooth two smaller granules; middle not granulate, but slightly produced; clypeus and disc densely and coarsely punctate; interstices between punctures almost one-fourth as wide as diameter of punctures; large supraocular and indifferent area on vertex impunctate; surface moderately shiny; on parts of vertex indistinct weak microsculpture present.
Antennae with oblong second antennomere; third antennomere conical; one-fourth shorter than second; antennomeres 4 to 6 quadrate and equal in width; antennomeres 7 to 11 much wider and longer than preceding ones, slightly wider than long.
Pronotum: 0.80 mm long, 0.85 mm wide; widest at anterior angles, in anterior two-third slightly narrowed; in posterior third more strongly convergent to posterior angles; posterior angles obtusely rounded; lateral margin fine; in dorsal aspect, not visible at anterior angles; surface with large and deep setiferous punctures; interstices between punctures approximately half as wide as diameter of punctures; at each side of wide impunctate midline with row of 10 to 11 punctures partly forming coriaceous furrow; without microsculpture, but with sparse micro-punctation; surface shiny.
Elytra: 1.0 mm long, 0.90 mm wide; with dense, partly coriaceous setiferous punctures; punctures forming irregular rows; punctation laterally sparser than on disc; surface shiny, but partly with weak coriaceous groundsculpture.
Abdomen with dense setiferous punctation; setae pointing to middle; interstices between punctures less than one-fourth of diameter of punctures.
Protibia 0.48 mm long, 0.17 mm wide; with 9 spines at outer edge; apical spines inserted on short digits; WLR: 2.1; in posterior aspect, comb at inner emargination visible, but partly covered in apical part; on posterior face with dense setation.
Aedeagus stout with short apical lobe and four sensillae at inner edge.
description: Published as part of Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), pp. 231-354 in Beiträge Zur Entomologie = Contributions to Entomology 64 (2) on pages 238-239, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706