Osoriellus macrops, Irmler, 2014

Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 64 (2), pp. 231-354 : 254

Osoriellus macrops n. sp.

( Figs 35 A-C, 41E)

Type material: Holotype, male: Brazil: Amazonas, Reserva Ducke (59°55'W, 2°52'S), 26 km NE Manaus, flight intercept trap, 1995-1996 ( BMNH).

Paratype: Brazil: Amazonas, Manaus, female, 26.10.1955, leg. Elias & Roppa ( UIC) .

Diagnosis: The species mostly resembles O. solidus and can be hardly differentiated from that species. In contrast to O. solidus , the microsculpture of the posterior tergites is dense and distinct and the surface is matt. Additionally, remains of isodiametric microsculpture are found on the pronotum in O. macrops , but not in O. solidus .

Description: Length: 7.0 mm. Colouration: Black; legs and antennae brown.

Head: 0.91 mm long, 1.59 mm wide; eyes thick and distinctly prominent; approximately 1.5 times as long as temples; sides of fore-head narrowed to anterior angles in deep sinuate curve; anterior edge of clypeus even; punctation coarse and moderately dense; large punctures without setae, except few punctures on clypeus, two on vertex and few on supraocular area; partly coriaceous; interstices between punctures irregularly wide; on average, much smaller than diameter of punctures; without impunctate midline; close to neck with narrow transverse impunctate area; without microsculpture; surface shiny.

Antennae slightly shorter than head and half of pronotum combined; second antennomere oval; slightly thicker and longer than conical third antennomere; following antennomeres increasing in width; fourth antennomere slightly longer than wide, fifth quadrate and following antennomeres slightly wider than long.

Pronotum: 1.42 mm long, 1.67 mm wide; widest at anterior angles; anterior angles rectangular; sides narrowed to posterior angles in even slightly convex curve; posterior angles obtuse; smoothly rounded; lateral margin fine in anterior half; slightly widened to posterior angles; in dorsal aspect, covered close to anterior angles; punctation coarse and moderately dense; without setae; impunctate midline in anterior half extremely narrow; in posterior half slightly wider; on average, interstices between punctures slightly shorter than diameter of punctures; between coarse punctation with dense micro-punctation; isodiametric microsculpture weak; hardly visible; surface shiny.

Elytra: 1.77 mm long, 1.76 mm wide; shoulders obtuse, but nearly rectangular; sides slightly widened to posterior third; punctation approximately as dense and coarse as on pronotum; without setae; coriaceous ground-sculpture weak; less deep than punctures.

Abdomen with dense and moderately deep punctation; punctures without setae; punctation on distal tergites denser than on apical tergites; punctures on tergites VII and VIII elongate; microsculpture on apical tergites netlike and weak; microsculpture on tergites VII and VIII densely elongate and deep; apical tergites shiny; distal tergites matt.

Protibia: 0.79 mm long, 0.28 mm wide; outer edge with 9 spines; apical spines on long digits; WLR: 0.49; in posterior aspect, comb of inner emargination totally visible; posterior face sparsely covered by long yellow setae; on average, setae half as long as protibial width or slightly longer.

Aedeagus with long and slender apical lobe; apical lobe much longer than basal lobe; ending in shortly rounded apex; inner edge of apical lobe with sparse row of sensillae.

Etymology: The specific name is a combination of the epithet macro meaning large and ops meaning eye and refers to the large eyes of the species.

Figures

Fig. 32-37: Osoriellus-guiananus-group: Osoriellus guiananus (32), O. breviceps (33), O. solidus (34), O. macrops (35), O. melancholicus (36), O. diversus (37); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.