Osoriellus coruscus Irmler 2014, n. sp.
Creators: name: Irmler, Ulrich
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Osoriellus
Osoriellus coruscus

description: Osoriellus coruscus n. sp.
(Figs 45 A-C, 95C)
Type material: Holotype, male: Brazil: Rio de Janeiro, Paulo a Virginia, 10.8.1958, leg. R. Arlé (377) (INPA).
Paratype: Brazil: female with same data as holotype (UIC).
Diagnosis: The species resembles O. exiguus in size and shape of the pronotum. In addition to the differences mentioned below in the diagnosis of O. exiguus, the shape of the aedeagus slightly differs from that of O. exiguus. In O. coruscus the apical lobe is short and thick and the apex truncate, whereas it is elongate in O. exiguus.
Description: Length: 2.6 mm. Colouration: Dark yellow; posterior margin of elytra light brown; legs and antennae light yellow.
Head: 0.35 mm long, 0.47 mm wide; eyes small; not prominent; temples twice as long as eyes; side of fore-head more or less evenly convergent to front angles of clypeus; angles of clypeus produced to short teeth; setiferous punctation of clypeus sparse; punctation of vertex much denser and deeper, but with wide impunctate midline; microsculpture weak; laterad deeper and denser; midline without microsculpture; surface shiny; supraocular area less shiny than vertex.
Antennae slightly longer than head; second antennomere thick and oblong; thicker than antennomeres 3 to 5; third antennomere conical; only half as long as second; fourth to fifth antennomeres approximately quadrate; sixth antennomere wider than long; following antennomeres distinctly wider than preceding antennomeres and increasing in width; 1.5 times as wide as long.
Pronotum: 0.45 mm long, 0.50 mm wide; widest at anterior angles; slightly narrowed to smoothly rounded posterior angles; lateral margin narrow; in dorsal aspect, not visible near anterior angles; setiferous punctation as deep and dense such as on posterior head; on average, interstices between punctures less than half as wide as diameter of punctures; without microsculpture; surface polished and shiny.
Elytra: 0.60 mm long, 0.50 mm wide; with coarse and deep setiferous punctation; ground-sculpture distinctly coriaceous and deep; punctation scarcely visible; surface matt. Abdomen with deep and coarse setiferous punctures; tergites without basal impression; punctation on segments VII and VIII slightly less dense than on preceding segments; anterior segments matt; segments VII and VIII slightly shiny.
Protibia: 0.27 mm long, 0.07 mm wide; 8 long spines on outer edge; apical spines not inserted on digits; WLR: 2.0; in posterior aspect, comb of inner emargination totally visible; posterior face with sparse setation; setae approximately half as long as protibial width.
Aedeagus thick; with short and stout apex; apical lobe smoothly curved.
Etymology: The specific name coruscus derived from the same Latin word meaning shiny and refers to the shiny surface of the pronotum.
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 263-264, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706