Osoriellus huggerti, 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 : 271

Osoriellus huggerti n. sp.

( Figs 49 A-C, 95B)

Type material: Holotype, male: Ecuador: Napo, Baeza , 12.- 22.11.1983, leg. L. Huggert ( NHMS).

Paratypes: female with same locality as holotype, but 13.11.1983, leg. L. Huggert ( NHMS) .

Diagnosis: Concerning the iridescent shine of the head and pronotum, the species resembles O. flaveolus . In contrast to O. flaveolus , the punctation of the pronotum is distinctly denser. Whereas the pronotal punctation of O. flaveolus is sparse with the interstices between the punctures much wider than the diameter of punctures, the interstices between the pronotal punctures in O. huggerti are less than half of the diameter of the punctures.

Description: Length: 3.5 mm long. Colouration: Dark brown; legs and antennae reddish.

Head: 0.53 mm long, 0.73 mm wide; eyes slightly shorter than temples; sides in front of eyes shortly convergent to front angles; front angles of clypeus produced to short triangular teeth; front edge between teeth slightly emarginate; setiferous punctation moderately dense and deep; on average, interstices between punctures slightly shorter than diameter of punctures; with wide impunctate midline on vertex and small impunctate area at base of antennae; microsculpture fine; mostly isodiameteric; surface with iridescent shine.

Antennae nearly as long as head and half of pronotum combined; second antennomere thicker and slightly longer than third; following antennomeres increasing in width and approximately quadrate; only eighth and nineth antennomeres wider than long.

Pronotum: 0.74 mm long, 0.77 mm wide; widest at anterior angles; evenly convergent to obtuse posterior angles; lateral margin fine; at anterior angles finer than at posterior angles; setiferous punctures large; in irregular rowes; interstices between punctures shorter than diameter of punctures; in row adjacent to impunctate midline less than half of diameter of punctures; irregular microsculpture similar as on head, but still weaker; surface with iridescent shine.

Elytra: 0.75 mm long, 0.76 mm wide; with coarse coriaceous ground-sculpture; setiferous punctation in irregular rows.

Abdomen with setiferous punctation on all tergites; irregular impunctate midline only on posterior tergites VI to VIII; without or only weak traces of microsculpture; surface shiny.

Protibia: 0.43 mm long, 0.13 mm wide; 8 spines on outer edge; apical spines on short digits; WLR: 1.36; in posterior aspect, comb of inner emargination visible throughout its total length; posterior face with moderately dense long yellow setation.

Aedaegus elongate; apical lobe straight at base, then suddenly angulate in nearly rectangular angle and narrowed to acute apex; without sensillae at inner edge of apical lobe.

Etymology: The specific name derived from the name of its collector, L. Huggert.

Figures

Fig. 48-52: Osoriellus-s. str.-group: Osoriellus lewisi (48); O. huggerti (49), O. flaveolus (50), O. coriaceus (51), O. latitibialis (52); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.