Osoriellus anceps Irmler 2014, n. sp.
Creators: name: Irmler, Ulrich
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Osoriellus
Osoriellus anceps

description: Osoriellus anceps n. sp.
(Figs 29A, C, 31B)
Type material: Holotype, male: Peru: Madre de Dios, Pantiacolla Lodge, 4-7 km NW, El Mirador Trail, 500-800 m elevation, Alto Madre de Dios River (12°39.10'S, 71°15.28'W), collected on logs, 23.10.2000, leg. R. Brooks, #PERU1800 080 (KNHM).
Diagnosis: The species can be easily identified by the specific structure of the clypeus. According to the deep emargination of the clypeus, it resembles O. cornifrons, but the broad triangular prominences are only present in O. anceps.
Description: Length: 9.5 mm. Colouration: Black; legs and antennae dark brown.
Head: 1.35 mm long, 1.86 mm wide; eyes slightly prominent and slightly longer than temples; sides of fore-head deeply emarginate; sides of clypeus parallel; anterior angles of clypeus produced to broad triangles; between triangles with deep semicircular emargination; mandibles elongate and prominent; setiferous punctation deep; impunctate areas at base of antennae and on midline of vertex; interstices between punctures as wide as or slightly shorter than diameter of punctures; netlike microsculpture deep; surface matt.
Antennae as long as head; second antennomere oval; third conical and slightly shorter than second; fourth antennomere slightly longer than wide; following antennomeres approximately quadrate and and slightly increasing in width.
Pronotum: 1.81 mm long, 1.91 mm wide; widest at obtuse anterior angles; slightly narrowed in anterior half; more distinctly narrowed in posterior half; lateral margin finer in anterior half than in posterior half; setiferous punctation deep, but distinctly sparser than on head; moderately wide midline impunctate; interstices between punctures irregular; ranging from as wide as to twice as wide as diameter of punctures; in posterior half small areas impunctate; netlike microsculpture weaker than on head and surface shinier.
Elytra: 2.09 mm long, 2.00 mm wide; with coriaceous ground-sculpture; setiferous punctation in irregular rows; punctures hardly visible in ground-sculpture.
Abdomen with dense setiferous punctation; punctation still denser than on head; netlike microsculpture deep and dense; surface matt.
Protibia: 1.09 mm long, 0.38 mm wide; thick and nearly semicircular; 9 spines at outer edge; apical spines inserted on extremely short digits; WLR: 3.0; in posterior aspect, comb of inner emargination shortly covered in middle; posterior face with dense yellow setation; on average, setae slightly longer than half of protibial width.
Aedeagus broad and thick; rectangularly angulate; apical lobe slightly sinuate; ending in thick obtuse apex.
Etymology: The specific name derived from the same Latin word meaning on both sides and refers to the two prominent triangles on both sides of the clypeus.
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 249, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706