Osoriellus bovis, 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 : 240-241

Osoriellus bovis n. sp.

( Figs 12 A-D, 20C)

Type material: Holotype, male: French Guyana: Roura, 8.4 km SSE (52°13.0'W, 4°40.0'N), 200 m elevation, flight intercept trap, 29.05.- 10.06.1997, leg. J.S. Ashe, R. Brooks, #FG1AB97 182 ( KNHM).

Paratypes: French Guyana: 1 male with same dates as holotype; 1 female, Matoury, 41.5 km SSW on Hwy N 2 (52°22.35'W, 4°37.22'N), 50 m elevation, flight intercept trap, 26.- 28.05.1997, leg. J. Ashe, R. Brooks, #FG1AB97 060 ( KNHM, UIC); Guyana: Essequibo River, Moraballi Creek , female, 1929, Oxford University Expedition ( BMNH) .

Diagnosis: As O. notmani and O. cornutus , O. bovis carries a pair of long lateral teeth on the clypeus. It is smaller than these two species, in particular, compared to O. notmani with 5.9 mm length. Furthermore, in contrast to O. notmani , O. bovis has no digitate protibia as the other species of the O.- bicornis -group, whereas O. notmani has long apical digits on outer edge of the protibia and is, therefore, placed to the remainingspecies-group. O. bovis can be identified by the long yellow setae of the head and pronotum and the large, distinctly prominent eyes.

Description: Length: 4.5 mm. Colouration: Dark brown; elytra lighter brown; legs and antennae reddish.

Head: 0.49 mm long, 0.85 mm wide; large eyes distinctly prominent; temples one-fourth as long as eyes; sides of fore-head deeply concave; sides of clypeus parallel; lateral angles of clypeus produced to long acute teeth; teeth longer than one-fourth of width between them; setiferous punctation fine and irregularly dense; on vertex, interstices between punctures as wide as diameter of punctures; long yellow setae pointing anteriad; wide midline impunctate; coriaceous microsculpture dense and deep; surface matt.

Antennae as long as head and half of pronotum combined; second antennomere thick and oval; third antennomere narrower than second, but conical; antennomeres 4 to 6 as wide as third, but quadrate; antennomeres 7 to 10 wider than preceding antennomeres and quadrate.

Pronotum: 0.82 mm long, 0.87 mm wide; widest at shortly produced anterior angles; anterior angles acute; sides evenly convergent to posterior angles; posterior angles rounded; lateral margin fine; in dorsal aspect, invisible in anterior third; setiferous punctation large and dense; interstices between punctures one-fourth as wide as diameter of punctures; wide midline impunctate; long yellow setae pointing anteriad; longitudinal microsculpture weak; surface shiny.

Elytra: 1.01 mm long, 0.91 mm wide, with coriaceous ground-sculpture; setiferous punctation in longitudinal rows; finer than on pronotum; surface less shiny than that of pronotum.

Abdomen densely punctate; on tergites V to VII narrow midline without setiferous punctures.

Protibia: 0.54 mm long, 0.17 mm wide; at outer edge with 10 long spines; apical spines not inserted on digits; WLR: 5.7; in posterior aspect, comb of inner emargination partly covered in middle; posterior face densely covered by long yellow setae.

Aedeagus angulate in nearly rectangular angle; apical lobe long; obtuse at apex; inner edge of apical lobe with 7 sensillae; another group of five sensillae at base of apical lobe.

Etymology: The specific name derived from the same Latin word meaning cow and refers to the pair of acute teeth of the clypeus.

Figures

Fig. 12-15: Osoriellus-bicornis-group:Osoriellus bovis (12), O. cornutus (13), O. bicornis (14), O. spinosus (15); antenna (A), protibia (B), aedeagus in lateral aspect (C), anterior edge of clypeus (D); scale bar: 0.1 mm.