Osoriellus subsinuatus, 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 : 245

Osoriellus subsinuatus n. sp.

( Figs 17 A-C, 20G)

Type material: Holotype, male: Peru: Tambopata Prov. , 15 km NE Puerto Maldonado, ex. Flight intercept trap, 22.6.1989, leg. J.S. Ashe & R.A. Leschen, # 195 ( KNHM) . Paratypes: Peru: 3 females with same data as holotype, but 24.6.1989, #195, #246 and #249; Tambopata Prov., Dpt O. Madre de Dios, 15 km NE Puerto Maldonado, Maldonado Reserva Cuzco Amazónico (12°33'S, 69°03'W), 200 m elevation, Plot #Z2E14, ex flight intercept trap , 1 male, 1 female, 17.6.1989, leg. J.S. Ashe & R.A. Leschen, # 118, 2 females with same data, but #Z2E17, 15.6.1989, #065; 28.6.1989, #314 ( KNHM, UIC) .

Diagnosis: As in O. sinuatus and O. sinuatoangularis , slight emarginations are found at posterior angles in O. subsinuatus . Compared to those species, the emargination is smallest in O. subsinuatus . Furthermore, the pronotal microsculpture in O. subsinuatus is deeper and the surface, thus, less shiny and the punctation coarser and deeper than in O. sinuatus and O. sinuatoangularis .

Description: Length: 4.8 mm. Colouration: Black; elytra, posterior margin of pronotum, and legs reddish; antennae yellow.

Head: 0.66 mm long, 0.93 mm wide; eyes slightly prominent and slightly longer than temples; sides of fore-head narrowed to anterior margin in concave curve; angles of clypeus produced to acute teeth; setiferous punctation irregularly deep and dense; on fore-head sparser and weaker than on vertex and with impunctate midline; interstices between punctures as wide as diameter of punctures; on supraocular area, punctures partly coriaceous and granulate; distinct microsculpture netlike; surface slightly shiny.

Antennae slightly longer than head; second antennomere globular, third conical and shorter than second; antennomeres four to six quadrate and as thick as third antennomere; antennomeres seven to ten distinctly wider than preceding antennomeres; antennomeres 7, 9, and 10 quadrate, 8 wider than long.

Pronotum: 0.93 mm long, 1.01 mm wide; widest at anterior angles; evenly convergent to posterior angles; at anterior angles, lateral margin very fine and covered in dorsal aspect; lateral margin slightly widened to posterior angles; ending shortly in front of posterior angles; at posterior angles with short and weak emargination; setiferous punctation coarse and deep; punctation partly depressed as irregular longitudinal or diagonal impressions; impunctate midline; distinct netlike microsculpture; surface slightly shiny.

Elytra: 1.08 mm long, 1.01 mm wide; with dense setiferous punctation on coriaceous ground-sculpture; surface slightly more shiny than on pronotum.

Abdomen with impunctate midline and dense setiferous punctation on each side of midline; without microsculpture; surface polished and shiny.

Protibia: 0.58 mm long, 0.17 mm wide; nearly semicirular; with 9 spines on outer edge; apical spines not inserted on digits; WLR: 5.0; in posterior aspect, comb at inner emargination visible throughout its total length; posterior face densely covered by yellow setae.

Aedeagus with long apical lobe ending in obtusely rounded apex; inner edge with 8 sensillae.

Etymology: The specific name means slightly emarginate and refers to the short and weak emargination at posterior angles of the pronotum.