Neosorius brasiliensis, Irmler, 2015

Irmler, Ulrich, 2015, New Neotropical genera and species of the tribe Osoriini (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 65 (1), pp. 173-196: 183

publication ID 10.21248/contrib.entomol.65.1.173-196

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scientific name

Neosorius brasiliensis

spec. nov.

Neosorius brasiliensis   spec. nov.

( Figs 12A–C View Fig , 16E View Fig )

Type material: Holotype male: Brazil, Minas Gerais, Govenador Valadares (41°56'W, 18°51'S), leaf litter, 26.3.1981, leg. L. Sorkin ( AMNH). GoogleMaps  

Paratype: Brazil, Rio de Janeiro, Ipanema , collected by light fixture, female, 13.9.1982, leg. L. Sorkin ( UIC)   .

Etymology: The specific name is derived from the country, where the species was found.

Description: Length: 4.4 mm. Colouration: Black; legs reddish brown, antennae slightly lighter reddish brown.

Head: 0.67 mm long, 0.92 mm wide; eyes prominent; as long as temples; sides of fore-head narrowed to anterior angles of clypeus in slight concave curve; anterior edge of clypeus even; surface of clypeus finely, but distinctly striate; vertex with coarse longitudinal striae ending on line with posterior edge of eyes; neck without striae; only with fine transverse micro-reticulation; within striae sparse setiferous punctation; setae as long or slightly longer than interstices between punctures; small area at base of antennae without punctures and striae; surface matt.

Antennae slightly shorter than head and half of pronotum combined; second antennomere oval; nearly twice as long as wide; third antennomere conical and slightly shorter than second; following antennomere increasing in width, but all approximately quadrate or slightly wider than long.

Pronotum: 0.85 mm long, 1.00 mm wide; widest shortly behind anterior angles; anterior angles obtuse; sides narrowed to posterior angles in smooth convex curve; posterior angles obtuse and smoothly rounded; lateral margin fine; in dorsal aspect covered close to anterior angles; continued to posterior margin; setiferous punctation moderately dense and deep; on average, interstices between punctures as wide as diameter of punctures; between normal punctation with fine micro-punctation; without microsculpture; surface shiny.

Elytra: 1.07 mm long, 1.04 mm wide; widest in posterior third; shoulders rectangular, but rounded; setiferous punctation as dense and deep as on pronotum; coriaceous ground-sculpture weak; surface shiny.

Abdomen with moderately dense setiferous punctation; punctures finer than on elytra and pronotum; narrow midline impunctate; netlike microsculpture weak; surface less shiny than on pronotum.

Protibia: 0.53 mm long, 0.13 mm wide; with seven spines on outer edge; apical spines on long digits; WLR: 0.56; between spine two and three at apex with wider interstice than between other spines; posterior face with row of five spines; apical spines inserting on short digits; between spines with sparse setation; in posterior aspect, inner emargination with comb totally visible.

Aedeagus with thick apical lobe; suddenly narrowed to obtuse apex; endophallus spiralled with three torsions.

Diagnosis: The species is characterised by the longitudinal striae of the head and the smoothly curved sides of the pronotum. Additionally, it is distinctly smaller than N. mexicanus   . According to the descriptions of FAGEL (1959) it resembles species of the African Neosorius   of the arebianus-group.


American Museum of Natural History