Osoriellus punctatellus, 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

Osoriellus punctatellus n. sp.

( Figs 47 A-C, 94E)

Type material: Holotype, male: Ecuador: Cotopaxi, Tinalandia , Santo Domingo de los Colorados , 700 m elevation, collected at light, 18.5.1993, leg. J.J. Morrone ( AMNH).

Paratypes: Ecuador: with same data as for holotype, abdomen lost ( UIC) ; Pichincha, Tinalandia (79°03'39W, 0°16'53S), 800 m elevation, 2 females, 2.11.1983, leg. L. Huggert ( SMNH) ; Pichincha, Maquipucuna, 50 km NW Quito, banana, Berlese , female, 23.12.1991, leg. C.E. Carlton ( KNHM) ; Maquipucuna , montane evergreen forest litter, male & female, 27.10.1999, leg. R. Anderson ( KNHM) ; Peru: Madre de Dios, 15 km NE Puerto Cusco Amazonica , flight intercept trap, female, 17.06.1989, leg. R. Leschen ( KNHM) ; Panama: Colon, Parque Nat. Soberania Pipeline Road (79°45'W, 9°07'N), flight intercept trap, female, 27.05.1995, leg. J. Jolly & C. Chaboo ( KNHM) ; Colon, Parque Nat. Soberania, Pipeline Road (79°45'W, 9°07'N), from leaf litter, female, 29.05.1995, leg. J. Jolly & C. Chaboo ( UIC) ; Colon, Parque Nat. Soberania, Pipeline Road km 5.3 (79°45'W, 9°07'N), 40 m elevation, collected by flight intercept trap, male, 31.5.- 2.6.1995, leg. J. Ashe & R. Brooks ( KNHM) .

Diagnosis: The species strongly resembles O. indescriptus in size and both the shape and punctation of the pronotum. The colouration is darker than in O. indescriptus and the aedeagus has a more acute apex, whereas the adeagal apex of O. indescriptus is stout. The shape of the aedeagus is similar to that of O. exiguus , but the pronotal punctation of O. exiguus is distinctly sparser.

Description: Length: 2.8. Colouration: Black; elytra dark brown with posterior margin black; anterior margin of clypeus yellow; legs and antennae yellow.

Head: 0.45 mm long, 0.50 mm wide; with eyes not prominent; as long as temples; shape of fore-head trapezoidal; setiferous punctation dense and deep; on supraocular vertex still coarser; on lateral clypeus sparser and finer; wide midline impunctate; midline on clypeus wider than on posterior vertex; without microsculpture; surface of midline and clypeus polished and shiny.

Antennae with second antennomere oval and slightly thicker than following 4 antennomeres; third antennomere conical; fourth antennomere quadrate; antennomeres 5 and 6 slightly wider than long, but not wider than preceding antennomeres; antennomeres 7 to 11 much wider than preceding antennomeres and wider than long; tenth antennomere nearly twice as wide as long.

Pronotum: 0.50 mm long, 0.50 mm wide; widest at anterior angles; evenly convergent to posterior angles in smooth curve; in posterior third slightly more strongly convergent; lateral margin fine; in dorsal aspect, not visible in anterior half; setiferous punctation coarse, deep and dense; on average, interstices between punctures one-fourth as wide as diameter of punctures; with narrow impunctate midline; without microsculpture, but with sparse micro-punctation; surface polished and shiny.

Elytra: 0.65 mm long, 0.55 mm wide; with deep and coarse setiferous punctation; with remains of microsculpture, but mainly polished and shiny.

Abdomen deeply and densely punctate; narrow midline without setiferous punctures and shiny.

Protibia: 0.30 mm long, 0.10 mm wide; nearly semicircular; 8 spine on outer edge; WLR: 2.50; in posterior aspect, comb of inner emargination totally visible; posterior face densely covered by setae.

Aedeagus with long basal lobe; acute apical lobe nearly in rectangular angle to basal lobe.

Etymology: The specific name refers to the densely and coarsely punctate pronotum.

Figures

Fig. 43-47: Osoriellus-s. str.-group: O. exiguus (43), Osoriellus indescriptus (44), O. coruscus (45), O. luteus (46); O. punctatellus (47); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.