Osoriellus pubescens, 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

Osoriellus pubescens n. sp.

( Figs 23 A-C, 27D)

Type material: Holotype, male: Panama: Veraguas, 6.1 km N of Santa Fe, Cerro Tute (81°07.06'W, 8°30.30'N), 1220 m elevation, cloud forest litter, 13.6.1996, leg. R. Anderson, #PAN2A96 96-127D ( KNHM).

Paratypes: Panama: Chiriqui, La Fortuna, Continental Divide Trail (82°12.0'W, 8°46.0'N), 1200 m elevation, berlese forest litter, abdomen lost, 9.6.1995, leg. R. Anderson, #PAN 2A95 10B ( UIC) ; Costa Rica: Alajuela, Peñas Blancas , 850 m elevation, sifted fruit and flower fall, female, 18.5.1989, leg. J. Ashe, R. Brooks, R. Leschen ( KNHM) .

Diagnosis: The species resembles O. setosus cencerning the size and shape of the pronotum. It can be differentiated from that species by the asymmetric shape of the aedeagus and the evenly punctate head.

Description: Length: 6.5 mm. Colouration: Black; legs and antennae brown.

Head: 0.91 mm long, 1.29 mm wide; eyes moderately large; as long as temples; sides of fore-head emarginate; anterior edge of clypeus even; setiferous punctation even; on average, interstices between punctures as wide as diameter of punctures; small area on central posterior vertex and at base of antennae impunctate; punctures close to neck partly granulate; netlike microsculpture weak; surface shiny.

Antennae slightly longer than head; second antennomere globular; as long as third; following antennomeres four to seven approximately quadrate; antennomeres eight to ten slightly longer than wide.

Pronotum: 1.32 mm long; 1.52 mm wide; widest at anterior angles; evenly narrowed to widely rounded posterior angles; anterior angles produced to short acute teeth; lateral margin fine; finer at anterior angles than at posterior angles; setiferous punctation dense and deep; narrow midline impunctate; interstices between punctures one fourth as wide as diameter of punctures; without microsculpture except remains of weak netlike microsculpture close to posterior margin; surface shiny.

Elytra: 1.53 mm long, 1.44 mm wide; as densely and deeply punctate as pronotum, but setiferous punctures hardly visible in deep coriaceous ground-sculpture.

Abdomen with sparser setiferous punctation than forebody; moderately wide midline on tergites impunctate; netlike microsculpture distinct.

Protibia: 0.92 mm long, 0.27 mm wide; 8 long spines at outer edge; apical four spines inserted on moderately long digits; WLR: 0.8; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face with moderately dense setation; on average, setae as long as half of protibial width.

Aedeagus rectangularly angulate; asymmetric; left side of apical lobe with moderately large basal plate; right side without central tooth; both sides of inner edge with few setae.

Etymology: The specific name refers to the dense setiferous punctation of the total body.

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.