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

description: Osoriellus fumarius n. sp.
(Figs 92 A-C, 100F)
Type material: Holotype, male: Peru: Huanuco Prov., Panguana, Cocha, collected between June – October 1976, leg. W. Hanagarth (UIC).
Diagnosis: The species is very similar to O. caliginosus concerning the sligthly sinuate sides of the pronotum. The further differentiating characters are described under O. caliginosus.
Description: Length: 6.4 mm. Colouration: Black; legs and antennae dark brown; elytra and abdomen lighter brown.
Head: 0.81 mm long, 1.33 mm wide; eyes slightly prominent; approximately twice as long as temples; sides of fore-head narrowed to slightly produced anterior angles in smoothly concave curve; anterior edge of clypeus slightly emarginate; setiferous punctation moderately deep and irregularly dense; on clypeus much sparser than close to neck; wide midline, area at base of antennae and transverse oval area close to neck impunctate; on clypeus, interstices between punctures at least as wide as diameter of punctures; on vertex, interstices between punctures approximately half as wide as diameter of punctures; on supracocular area punctation still denser; partly coriacous; setae long and yellow; isodiametric microsculpture dense, but weak; surface slightly shiny.
Antennae slightly longer than head; second antennomere oval; slightly longer than conical third antennomere; antennomeres four to six as wide as preceding antennomeres, but quadrate; following antennomeres slightly wider than preceding antennomeres and also quadrate; last antennomere elongately oval and less wide than tenth antennomere.
Pronotum: 1.19 mm long, 1.42 mm wide; widest close to rectangular anterior angles; in anterior half slightly narrowed; in posterior half strongly narrowed in concave curve to rectangular posterior angles; lateral margin distinct; in dorsal aspect, covered close to anterior angles; widened close to posterior angles; setiferous punctation deep and moderately dense; on average, interstices between punctures approximately twice as wide as diameter of punctures; wide midline impunctate; isodiameteric microsculpture as dense as but deeper than on head; surface matt.
Elytra: 1.50 mm long, 1.49 mm wide; shoulders shortly rounded; sides slightly widened to posterior third; setiferous punctation as deep as but denser than on pronotum; coriacous ground-sculpture weak, but isodiametric microsculpture as deep as and as dense as on pronotum; surface matt.
Abdomen with dense setiferous punctation; narrow midline impunctate; netlike microsculpture weak; surface shiny.
Protibia: 0.63 mm long, 0.23 mm wide; nearly semicircular; outer edge with 9 spines; apical spines inserting on very short digits; WLR: 1.8; in posterior aspect, comb at inner emargination visible throughout its total length; posterior face with moderately dense setation.
Aedeagus angulate in obtuse angle; basal lobe thick; apical lobe more slender; apical lobe evenly narrowed from base to obtuse apex; inner edge of apical lobe with numerous sensillae.
Etymology: The specific name fumarius derives from the same Latin word and means dark brown. It refers to the dark brown colouration of the species.
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 269-270, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706