Osoriellus rougemonti, 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 : 283-284

Osoriellus rougemonti n. sp.

( Figs 84 B-C, 100C)

Type material: Holotype, male: Ecuador: Napo Prov., Sacha Lodge (76°27.32"W, 0°28.15'S), 250 m elevation, 26.- 28.10.2004, leg. G. de Rougemont ( UIC).

Paratypes: Colombia: without further data, as O. columbicus in litteris name given by Bernhauer , female ( BMNH); Magdalena, N. Sierra Nevada de Marta, Rio Buritaca , male, 19.11.1974, leg. M. Cooper ( BMNH) .

Diagnosis: The species resembles O. schwarzi , O. opacus , O. opacinotus and O. neotropicus in size. It can be easily differentiated from O. opacus by the absence of the isodiametric microsculpture of the elytra and from O. schwarzi by the longitudinal microsculpture of the pronotum. Both O. opacinotus and O. neotropicus differ by the protibial digits, the shinier surface and the different shape of the pronotum. The apical part of the aedeagus in O. rougemonti is more curved and thicker than in O. schwarzi .

Description: Length: 5.8 mm. Colouration: Black, elytra dark red, legs light brown.

Head: 0.80 mm long, 1.22 mm wide; eyes not prominent; sides of fore-head concavely convergent to anterior margin of clypeus; anterior margin of clypeus even without lateral granules; setiferous punctation moderately dense; large area at base of antennae impunctate; punctation on supraocular area much denser than on vertex; partly coriaceous; isodiametric microsculpture deep and dense; surface hardly shiny.

Antennae destroyed.

Pronotum: 1.24 mm long, 1.37 mm wide; widest at anterior angles; anterior angles shortly produced to acute teeth; sides convergent in smooth curve to posterior smoothly rounded angles; in anterior half less convergent than in posterior half; anterior edge 1.7 times as wide as posterior edge; lateral margin moderately thick; in dorsal aspect, not visible close to anterior angles; setiferous punctation moderately dense; punctures larger than on head; on average, interstices between punctures as wide as diameter of punctures; within row adjacent to impunctate midline, interstices between punctures denser; approximately 10 punctures in row; between setiferous punctures with sparse micro-punctation; microsculpture distinct; partly netlike, partly longitudinal; surface more shiny than on head.

Elytra: 1.30 mm long, 1.35 mm wide; with weak coriaceous ground-sculpture; irregular rows of setiferous punctures distinctly visible.

Abdomen with dense setiferous punctation and with narrow impunctate midline on tergites; netlike microsculpture moderately weak; surface shiny.

Protibia: 1.09 mm long, 0.41 mm wide; 9 spines on outer edge; WLR: 6.0; in posterior aspect, comb of distinct inner emargination covered in middle; posterior face densely covered by short setae.

Aedaegus with apical lobe slightly shorter than basal lobe; thick apical lobe sharply curved and ending in obtuse apex.

Etymology: The species is named to honour its collector Dr. G. de Rougemont.

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.