Osoriellus rubripennis, 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 : 284-285

Osoriellus rubripennis n. sp.

( Figs 89 A-C, 100E)

Type material: Holotype, male: Peru: Tambopata Prov., Madre de Dios Depto., 15 km NE Puerto Maldonado, Reserva Cuzco Amazónico (69°03'W, 12°33S), 200 m elevation, Plot #Z2E17, collected by flight intercept trap, 20.6.1989, leg. J.S. Ashe, R.A. Leschen #175 ( KNHM).

Paratypes: Peru: 2 females with same date as holotype ( KNHM, UIC) .

Diagnosis: O. rubripennis is characterised by the deep isodiametric microsculpture of the pronotum and the matt pronotal surface. The trapezoidal shape of the pronotum is also found in several other species of the group, e.g. O. verhaagi . O. verhaaghi is larger and the isodiametric pronotal microsculpture is weaker and the surface shinier. A similar pronotal microsculpture is found in O. opacinotus of the remaining-species-group with long protibial digits that are absent in O. rubripennis . Additionally, O. opacinotus is larger and the pronotal lateral margin is different.

Description: Length: 5.1 mm long. Colouration: Dark brown, posterior edge of pronotum, elytra and abdomen dark reddish, legs and antennae red.

Head: 0.65 mm long, 1.05 mm wide; eyes slightly prominent and slightly longer than temples; fore-head deeply emarginate; sides of clypeus parallel; anterior edge of clypeus even with shortly produced acute angles; setiferous punctation irregularly dense and moderately deep; on clypeus sparser than on lateral vertex; on supraocular and postocular area, punctation very dense and granulate; on clypeus and posterior vertex with impunctate midline; wide area at base of antennae impunctate; yellow setae as long as diameter of punctures and interstice between two punctures combined; isodiametric microsculpture deep; surface matt.

Antennae slightly longer than head; second antennomere oval and slightly longer than conical third; antennomeres 4 to 6 slightly increasing in width and approximately quadrate; antennomeres 7 to 11 distinctly wider than preceding antennomeres, but also quadrate.

Pronotum: 1.12 mm long, 1.21 mm wide; widest close to anterior angles; anterior angles obtuse; sides evenly convergent to posterior angles; shortly in front of posterior angles slightly sinuate; posterior angles obtusely rounded; lateral margin fine; slightly widened close to posterior angles; in dorsal aspect, not visible close to anterior angles; setiferous punctation deeper than on head; irregularly dense; on average, interstices between punctures twice as wide as diameter of punctures; yellow setae as long as on head or slightly shorter; isodiametric microsculpture deeper than on head; surface matt.

Elytra: 1.19 mm long, 1.19 mm wide; widest in posterior third, but nearly parallel; setiferous punctation dense and moderately deep; denser than on pronotum and in irregular rows; with deep isodiametric microsculpture; surface still matter than on pronotum.

Abdomen with dense setiferous punctation; netlike microsculpture much weaker than on fore-body; punctures mostly granulate; last tergites without striae.

Protibia: 0.59 mm long, 0.19 mm wide; thick; nearly semicircular; 8 spines inserted directly on outer edge; WLR: 3.0; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face densely covered by long yellow setae.

Aedeagus with long apical lobe ending in widely rounded obtuse apex; apical lobe longer than basal lobe; at inner edge of apical lobe, one sensilla close to apex and seven sensillae closer to base.

Etymology: The specific name is a combination of the Latin words rubra meaning red and penna meaning elytra and refers to the reddish elytra.

Figures

Fig. 84-89: Osoriellus-s. str.-group: Osoriellus rougemonti (84), O. tunariensis (85), O. haitiellus (86), O. multipunctatus (87), O. verhaaghi (88), O. rubripennis (89); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.