Osoriellus pubicollis, 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 : 246-247

Osoriellus pubicollis n. sp.

( Figs 24A, C , 27B )

Type material: Holotype, male: Panama: Veraguas, Cerro Tute , 4 km W of Santa Fe, 850 m elevation, male, 30.7.1995, leg. Gillogly ( KNHM).

Paratypes: Panama: 1 female and 2 males with same data as holotype ( KNHM) ; Costa Rica: Cartago Prov., Ref. Nac. de Fauna Silvestre Tapanti , 1.5 km E Station (83°46.90'W, 9°44.97'N), 1240 m elevation, flight intercept trap, female, 30.10.- 1.11.2001, leg. R. Brooks, #CR1B01 14 ( KNHM, UIC) ; Ecuador: Napo Prov., 25 km W Tena, Tena-Talag Grande Road , 2000 ft elvation, litter near stream, female, 23.5.1993, leg. L. Herman, #2739 ( AMNH) ; Napo Prov. 69 km NE Baeza, 15 km SW Reventador , 4600 ft elevation, (without abdomen), litter, 28.- 30.10.1988, leg. L. Herman ( AMNH) .

Diagnosis: Among the O.- hirtulus -group, O. pubicollis is characterised by the polished and shiny pronotum. Additionally, compared to O. setosus and O. pubescens , the pronotum is less convergent from anterior to posterior angles.

Description: Length: 5.8 mm. Colouration: Dark brown; legs and antennae lighter brown.

Head: 0.86 mm long, 1.14 mm wide; eyes moderately large; not prominent; as long as temples; sides of forehead emarginate; anterior edge of clypeus even with two minute granules at angles; setiferous punctation on vertex denser than on fore-head; wide midline and area at base of antennae impunctate; very weak netlike microsculpture; more distinct on punctate areas; surface moderately shiny.

Antennae slightly longer than head; second antennomere globular and as long as third; following antennomeres approximately quadrate; sixth to eleventh antennomeres thicker than preceding antennomeres.

Pronotum: 1.14 mm long, 1.26 mm wide; widest at anterior angles; slightly convergent to posterior angles; posterior angles widely rounded; lateral margin fine; finer at anterior angles than at posterior angles; setiferous punctation dense and deep; on average, interstices between punctures half as wide as diameter of punctures; wide midline impunctate; without microsculpture; surface polished and shiny.

Elytra: 1.34 mm long, 1.27 mm wide; as densely and deeply punctate as on pronotum; setiferous punctures hardly visible in coriaceous ground-sculpture.

Abdomen with dense setiferous punctation and narrow impunctate midline on tergites; netlike microsculpture weak; surface slightly shiny.

Protibia: 0.68 mm long, 0.20 mm wide; 8 spines at outer edge; apical four spines inserted on short teeth; WLR: 0.9; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face with moderately dense setation; on average, setae as long as protibial width.

Aedeagus rectangularly angulate; asymmetric; left side of apical lobe with large basal plate; right side with central tooth; both sides of inner edge with several setae; apical lobe sinuate ending in hook-like acute apex.

Etymology: The specific name means with dense setose pronotum.

Figures

Fig. 21-26: Osoriellus-hirtulus-group: Osoriellus hirtulus (21), O. setosus (22), O. pubescens (23), O. pubicollis (24), O. setulosus (25), O. setifer (26); antenna (A), protibia (B), aedeagus in ventral and lateral aspects (C); scale bar: 0.1 mm.

Fig. 27: Osoriellus-hirtulus-group: Head and pronotum and elytra of Osoriellus hirtulus (A), O. pubicollis (B), O. setulosus (C), O. pubescens (D), O. setosus (E), O. setifer (F); scale bar: 0.5 mm.