Neosorius mexicanus, 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 : 183-184

Neosorius mexicanus spec. nov.

( Figs 13A–C , 16F )

Type material: Holotype male: Mexico, without further data, leg. Skwara ( NMPC).

Paratypes: two females with same data as holotype ( NMPC, UIC) .

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

Description: Length: 6.0 mm. Colouration: Black; legs and antennae brown.

Head: 1.03 mm long, 1.16 mm wide; eyes slightly prominent; temples approximately 1.5 times longer than eyes; fore-head narrowed to anterior angles of clypeus in long slight concave curve; anterior edge of clypeus deeply emarginate; thus, clypeal angles produced to broad triangles; clypeus with large elongate coriaceous punctures; on vertex similarly coarse elongate punctation separated by narrow impunctate midline; large area at base of antennae impunctate; continued to middle and separating clypeal punctation from vertex punctation; punctures of clypeus and vertex with setae; impunctate areas without microsculpture; overall surface matt, but impunctate areas shiny.

Antennae slightly longer than head; second antennomere elongate; slightly longer than wide; third antennomere conical and as long as second; following antennomeres increasing in width, but all approximately quadrate or slightly wider than long.

Pronotum: 1.08 mm long, 1.29 mm wide; widest in anterior third; smoothly narrowed to obtuse anterior angles; more distinctly narrowed to posterior angles; in front of posterior angles sinuate; posterior angles rectangular; lateral margin narrow; in dorsal aspect, lateral margin covered close to anterior angles; thicker close to posterior angles and continued to posterior edge; setiferous punctation deep and moderately dense; close to impunctate midline denser than laterad; on average, close to midline interstices between punctures half as wide as diameter of punctures; laterally, interstices between punctures as wide as diameter of punctures; between normal punctation with fine micro-punctures; without microsculpture; surface shiny.

Elytra: 1.28 mm long, 1.26 mm wide; widest in posterior third; shoulders rectangular, but rounded; setiferous punctation dense and deep; on average; interstices between punctures slightly shorter than diameter of punctures; coriaceous ground-sculpture weak; surface moderately shiny.

Abdomen with dense and fine setiferous punctation; punctures distinctly finer than on elytra; setae as long as two interstices between punctures; netlike microsculpture weak; surface moderately shiny.

Protibia: 0.74 mm long, 0.17 mm wide; with nine spines on outer edge; apical spines on moderately short digits; WLR: 0.65; on posterior face with row of five spines inserting on short digits; between spines sparsely covered by long yellow setae; in posterior aspect, inner emargination with comb totally visible.

Aedeagus with long apical lobe; broad at base; then suddenly narrowed to long small apex; apex slightly sinuate; at base of lateral apical lobe with numerous sensillae; endophallus smoothly spiralled; with only two torsions.

Diagnosis: The species can be easily identified by the deep emargination of the clypeus and the posteriad sinuate sides of the pronotum.

Figures

Fig. 10–14: Tumboecus struyvei (10); Osoriosetus hanagarthi (11), Neosorius brasiliensis (12), N. mexicanus (13), Paratrochus tilli (14); antenna (A), protibia in posterior aspect (B), aedeagus (C); antenna (A), protibia in posterior aspect (B), aedeagus (C); scale bar: 0.1 mm.

Fig. 16: Head, pronotum, and elytra of Neorhabdopsis brasiliensis (A), N. pecki (B), N. lutzi (C), N. panamae (D), Neosorius brasiliensis (E), and N. mexicanus (F); scale bar: 0.5 mm.