Osoriellus neotropicus ( BERNHAUER, 1908 ) 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 : 302-303

Osoriellus neotropicus ( BERNHAUER, 1908) new combination

( Figs 113 A-C, 124C)

Osorius neotropicus BERNHAUER, 1908 , 295

Osorius lynchi BERNHAUER, 1933: 333 new synonymy

Type material examined: Brazil: Rio Grande do Sul, male, without any further data (holotype of O. neotropicus in FMNH) ; Argentina: Buenos Aires, male, 189? (year can not be definitely recognised), leg. C. Bruch (holotype of O. lynchi in FMNH) .

Further material examined: Brazil: São Paulo, male without further data, leg. J. Mráz ( NHMP) ; Prov. Santa Fé, Chaco , 2 males, 2 females, 190?, leg. C. Bruch ( NHMP) ; Paraguay: Itapua, San Pedro Mi, 90 m elevation, San Rafael Reserve (55°48.18'W, 26°02.24'S), male, 28.11.2000, Z.H. Falin, #PAR1F00063 ( KNHM) .

Diagnosis: The species is similar to O. sexpunctatus of the same region, but O. neotropicus is distinctly smaller. It can be additionally distinguished from that species by the shorter lateral teeth at the anterior angles of the pronotum and, in particular, by the deeper and denser punctation and the weaker microsculpture. Bernhauer (1933) differentiated also O. lynchi based on a weaker microsculpture of the pronotum and red elytra. However, I cannot find any difference in the microsculpture and the red elytra can be referred to the damaged status of the O. lynchi holotype. The aedeagi are also identical in the two male type specimens.

Description: Length: 5.9 mm. Colouration: Black; legs and antennae reddish.

Head: 1.00 mm long, 1.25 mm wide; angles of clypeus granulate; anterior edge widely emarginate; distinctly and moderately densely punctuate; interstices between setiferous punctures as wide as or slightly wider than diameter of punctures; short yellow setae pointing diagonally posteriad; wide midline impunctate; several long supraocular setae; microsculpture isodiametric; surface slightly shiny.

Antennae with first antennomere as long as following 3 antennomeres, second antennomere oval and as long as conical third, antennomeres 4 to 6 approximately quadrate; following 4 antennomeres much thicker and wider than long.

Pronotum: 1.25 mm long, 1.35 mm wide; widest at anterior angles; evenly convergent to posterior angles; anterior angles slightly produced to short teeth; posterior angles obtuse; lateral and posterior margin narrow; punctures deep and large; interstices between setiferous punctures irregular; on average, as wide as diameter of punctures; irregular row of 7 to 8 punctures along wide impunctate midline; short yellow setae pointing posteriad; netlike microsculpture; surface slightly shiny.

Elytra: 1.30 mm long, 1.30 mm wide; with coriaceous ground-sculpture; setiferous punctures as deep and dense as on pronotum; short yellow setae pointing posteriad.

Abdomen with dense setiferous punctation; setae pointing diagonally posteriad.

Protibia: 0.62 mm long, 0.21 mm wide; with 7 spines on outer edge; apical three spines inserted on moderately long digits; WLR: 0.87; in posterior aspect, comb of inner emargination distinctly visible throughout its total length.

Aedeagus slender; with slightly curved apical lobe; apex narrow, but obtuse; inner edge of apical lobe with row of several sensillae.

Figures

Fig. 109-113: Remaining-species-group: Osoriellus cordovensis (109), O. germanus (110), O. notmani (111), O. opacinotus (112), O. sexpunctatus (113); antenna (A), protibia (B), aedeagus in ventral and lateral aspects (C); scale bar: 0.1 mm.