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

description: Osoriellus asperatus n. sp.
(Figs 67 A-C, 95F)
Type material: Holotype, male: Brazil: Amazonas, Manaus, INPA/Smithsonian Reserve 2 (59°50'W, 2°25'S), leaf litter of terra firme forest, collected by Winkler method, male, January 1994, leg. R. Didham (BMNH).
Paratypes: Brazil: with same data as for holotype, 3 females, 1 male, January 1994, February 1994, March 1994 (BMNH, UIC); Reserva Ducke, 26 km NE of Manaus, flight intercept trap, female, 1995-1996 (BMNH).
Diagnosis: The species is characterised by the dense coriaceous punctation of the pronotum that is so far unique in the Neotropical Osoriellus species.
Description: Length: 3.4 mm. Colouration: Black, anterior half of elytra dark red.
Head: 0.43 mm long, 0.69 mm wide; eyes thick and distinctly prominent; nearly twice as long as temples; sides of fore-head convergent to anterior angles; not sinuate; anterior edge of clypeus even; extremely dense setiferous punctation deep and coariaceous; interstices between punctures less than one fifth as wide as diameter of punctures; yellow setae long; only small area at base of antennae impunctate.
Antennae slightly shorter than head and half of pronotum combined; second antennomere oval and distinctly thicker than third antennomere; 1.5 times as long as third antennomere; following antennomeres increasing in width; third and fourth antennomeres approximately quadrate; following antennomeres wider than long; eighth antennomere 1.5 times as wide as long; tenth antennomere only slightly wider than long; surface matt.
Pronotum: 0.67 mm long, 0.70 mm wide; widest near anterior angles; sides approximately parallel in anterior half; in posterior half, more strongly and evenly narrowed to posterior angles; slightly sinuate shortly in front of posterior angles; posterior angles nearly rectangular; lateral margin fine; in posterior half, slightly wider than in anterior half; in dorsal aspect, hardly visible in anterior half; extremely dense setiferous punctation deep and coarse; partly coriaceous; punctures larger than on head; interstices between punctures one fifth as wide as diameter of punctures; wide, parallel midline impunctate; yellow setae at least as long as three times of diameter of punctures; without microsculpture; surface matt.
Elytra: 0.78 mm long, 0.75 mm wide; widest near middle; shoulders nearly rectangular; setiferous punctation less dense than on head and pronotum, but also deep and coarse; on average, interstices between punctures as wide as half of diameter of punctures; on average, yellow setae as long as double diameter of punctures; coriaceous ground-sculpture weak; surface matt.
Abdomen as densely and deeply punctate as fore-body; surface matt.
Protibia: 0.34 mm long, 0.12 mm wide; with 7 long spines on outer edge; apical spines inserted on short and wide digits; WLR: 3.1; in posterior aspect, comb at inner emargination totally visible; posterior face with moderately dense setation; yellow setae approximately as long as half of width of protibia.
Aedaegus with thick basal lobe and short and thick apical lobe; apical lobe narrowed to obtuse, widely rounded apex; on inner edge of apical lobe, one sensilla in apical third and four sensillae in basal third.
Etymology: The specific name derived from the same Latin word meaning coarse and refers to the coarse punctation 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 259-260, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706