Osorius laevicollis BERNHAUER

Irmler, Ulrich, 2010, The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 363-426 : 391

Osorius laevicollis BERNHAUER ,, 1908: 294 ( Figs 17 a-c)

Type material examined:

Bolivia: Lima : Mapiri (68°09' W, 15°15' S) 1 male without further data (holotype, FMNH) .

Additional material examined:

Ecuador: Sucumbios, Sacha Lodge (76°27' W, 0°28' S), under bark, 270 m elevation, 1 specimen, 24.3.1999 and in fruit fall, 1 specimen, 23.3.1999 leg. R.W. Brooks ( KU) ; Esmeraldas, Bilsa , 1 specimen, 5.6.1996, leg. P. Hibbs ( KU) ; Peru: Loreto, Boqueron del Padre Abad , 470 m elevation, 13 specimens, 8.8.1946, leg. F. Woytkowski ( AMNH, UIC) ; Junin, La Merced, Villa Rica Road (75°18' W, 10°47' S), flight intercept trap, 1450 m elevation, 1 specimen, 15.10.1999 and 9.5 km NE Villa Rica Rd. , 880 m elevation, 1 specimen, 15.10.1999, leg. R.W. Brooks ( KU) ; Madre de Dios, Pantiacolla lodge (71°16' W, 12°38' S), 8 km NW El Mirador , under bark, 950 m elevation, 1 specimen, 24.10.2000, leg. R.W.Rrooks ( KU) ; Piura, Divisoria Huan , 1 specimen, 8.8.1946, leg. F. Woytkowski ( AMNH) ; Ucayali, Aguaytia , 295 m elevation, 2 specimens, 15.9.1946, leg. F. Woytkowski ( AMNH) .

Diagnosis:

O. laevicollis is similar in size to O. dentatus , O. costaricensis and O. sublaevis , but is, on average, slightly larger than these species.The dense microsculpture and matte pronotal surface resembles that of O. costaricensis and O. sublaevis , but pronotal punctation is distinctly larger and denser. In contrast to O. costaricensis , the apex of the aedeagus is extremely acute and long.

Description:

Length: 7.8 mm. Colour: black, legs and antennae reddish brown.

Head :: 1.2 mm long, 1.5 mm wide; front edge laterad without prominence, but with a wide emargination centrally; punctation dense and moderately deep; on disc, distance between punctures shorter than diameter of punctures; with sparser punctation on clypeus; a small midline and an area above base of antennae impunctate; surface with very weak isodiametric microsculpture; shiny; with several supraocular granular setiferous punctures; with short longitudinal striae at temples behind eyes.

AntennaeAntennae with 2 nd antennomere short and nearly circular; conical 3 rd antennomere only slightly longer than 2 nd; antennomeres 4 to 10 increasing in width; 4 th antennomere quadrate; 10 th antennomere wider than long; relation length: width 0.77.

Pronotum: 1.4 mm long, 1.6 mm wide; widest at anterior edge; sides slightly narrowed in anterior half; distad more distinctly narrowed and slightly emarginate in front of posterior, obtusely rounded angles; lateral margin narrow in anterior half, widened to posterior angles; punctation finer and distinctly sparser than on head; distance between punctures two to three times wider than diameter of punctures; a narrow midline impunctate, but with short central groove; surface with isodiametric microsculpture; slightly shiny.

Elytra: 1.7 mm long, 1.6 mm wide; with deep coriaceous ground sculpture; punctation present, but scarcely visible between deep ground sculpture; in spite of deep ground sculpture, surface shiny.

Abdomen with very sparse and fine punctation and weak, netlike microsculpture; surface shiny; tergites without setae.

Front tibiatibia at outer edge with 9 spines; apical three ones inserting on short teeth.

AedeagusAedeagus oval in shape with extremely short apical part suddenly narrowed in front of acute apex.

Figures

Fig. 17: O. laevicollis. - Fig. 18: O. sublaevis. - Fig. 19: Osorius sinuatocollis (a: front body, b: antenna, c: aedeagus in ventral and lateral aspect; scale bar: a, b: 1 mm, c: 0.5 mm).