Osoriellus minor Irmler 2014, new combination
Creators: name: Irmler, Ulrich
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Osoriellus
Osoriellus minor

description: Osoriellus minor (NOTMAN, 1925) new combination (Figs 69 A-C, 97F)
Osorius minor NOTMAN, 1925: 4
Type material examined: Trinidad: Montserrat, 1 female, 30. June 1905, leg. A. Busck (holotype in NHMW).
Further material examined: Mexico: Quintana (87°35'W, 19°46'N), 12 km N Reforma, male, 14.10.1986, G. Rozen (AMNH).
Diagnosis: Among the similarly sized species of the O.-s. str.-group, O. minor is characterised by the absence of microsculpture on the pronotum and the dense setiferous punctation. In this respect, it resembles O. tuxtlae, but the pronotal sides are curved in O. minor, whereas they are forming a more trapezoidal shape in O. tuxtlae. The aedeagus of O. minor has a smoothly curved short apical lobe; whereas the aedeagus of O. tuxtlae is rectangularly angulate.
Description: Length: 4.8 mm. Colouration: Black; legs and antennae brown; posterior edge of pronotum dark reddish.
Head: 0.61 mm long, 0.94 mm wide; eyes slightly prominent; approximately twice as long as temples; angles of clypeus produced to short granules; setiferous punctation moderately dense and deep; posteriorly and laterally much denser than on clypeus; on clypeus, interstices between punctures at least twice as wide as diameter of punctures; on posterior vertex interstices between punctures shorter than diameter of punctures; supraocular punctures more distinctly granulate than punctures on vertex; few supraocular short striae; isodiametric microsculpture dense and distinct; surface slightly shiny.
Antennae with oval second and conical third antennomere equally long; following three antennomeres quadrate or slightly wider than long; last five antennomeres distinctly thicker than preceding antennomeres, but more or less quadrate.
Pronotum: 0.93 mm long, 1.00 mm wide; widest near anterior angles; evenly convergent to obtuse posterior angles; lateral margin fine; large setiferous punctures in irregular rows; on average, interstices between punctures half as wide as diameter of punctures; narrow midline impunctate; surface with weak netlike microsculpture; microsculpture less deep than on head and surface more shiny.
Elytra: 1.04 mm long, 1.04 mm wide; large setiferous punctures hardly visible between deep coriaceous ground-sculpture; punctures in irregular rows.
Abdomen with dense and deep setiferous punctation; isodiametric microsculpture distinct and similar as on head; microsculpture more distinct than on pronotum.
Protibia: 0.50 mm long, 0.17 mm wide; 8 spines on outer edge; apical spines inserted on short digits; WLR: 2.10; in posterior aspect, comb of inner emargination totally visible; posterior face with dense setation.
Aedeagus slender; apical lobe straight; slightly curved in nearly rectangular angle to acute apex; inner edge of apical lobe with row of several sensillae.
description: Published as part of Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), pp. 231-354 in Beiträge Zur Entomologie = Contributions to Entomology 64 (2) on page 279, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706