Osoriellus surinamensis, 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 : 288-289

Osoriellus surinamensis n. sp.

( Figs 55 A-C, 96A)

Type material: Holotype, male: Suriname: Brokopondo, Brownsberg Nature Preserve (55°10.53'W, 4°56.55'N), ca. 440 m elevation, ex flight intercept trap, 22.-25. Jun. 1999, leg. Z.H. Falin, #SUR1F99 ( KNHM).

Diagnosis: According to the size and microsculpture of the pronotum, the species resembles O. micros and O. brevicornis . Compared to both species, the eyes are more prominent, the pronotal punctation is denser and the antennae are thicker. In particular, the antennomeres 2 to 6 are distinctly thicker than in O. micros and O. brevicornis .

Description: Length: 3.8 mm. Colouration: Dark reddish; pronotum and abdomen slightly lighter reddish; legs and antennae yellow.

Head: 0.47 mm long, 0.72 mm wide; eyes prominent; slightly longer than temples; sides of fore-head convergent in concave curve to anterior angles; anterior edge of clypeus even with short granules at angles; setiferous punctation deep and moderately dense; on average, interstices between punctures slightly shorter than diameter of punctures; on supra- and postocular area few punctures with longer setae; netlike microsculpture dense and deep; surface matt.

Antennae slightly longer than head; second antennomere globular and thicker than conical third; antennomeres 4 to 6 as wide as third antennomere, but shorter; wider than long; antennomeres 7 to 10 distinctly wider than preceding antennomeres; approximately 1.5 times wider than long.

Pronotum: 0.69 mm long, 0.75 mm wide; widest at anterior angles; evenly convergent to posterior angles except slight emargination in anterior third and in front of posterior angles; lateral margin fine; finer in anterior half than in posterior half; in dorsal aspect, from anterior emargination to anterior angles not visible; setiferous punctation large and denser than on head; punctures in irregular rows; on average, interstices between punctures half as wide as diameter of punctures; impunctate midline at posterior edge twice as wide as at anterior edge; netlike microsculpture weaker than on head; surface, thus, more shiny than on head.

Elytra: 0.88 mm long, 0.82 mm wide; with rounded shoulders; setiferous punctation dense and deep; in irregular rows; weak coriaceous ground-sculpture and irregular, distinct microsculpture; surface matt.

Abdomen as densely and deeply punctate as elytra; punctures with yellow setae; narrow midline impunctate and shiny; anterior segments on punctate area with microsculpture; surface matt; segements VII and VIII without microsculpture; surface polished and shiny.

Protibia: 0.46 mm long, 0.14 mm wide; 10 spine on outer edge; WLR: 6.0; in posterior aspect, comb at inner emargination shortly covered in middle; posterior face with dense setation; setae nearly half as long as protibial width. Aedeagus with slightly curved apical lobe; apical lobe approximately in line with basal lobe; 6 sensillae at inner edge.

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

Figures

Fig. 53-57: Osoriellus-s. str.-group: Osoriellus brevicornis (53), O. micros (54), O. surinamensis (55), O. grossopunctatus (55); Osoriellus ashei (57); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.