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

description: Osoriellus cornifrons n. sp.
(Figs 30A, C, 31C)
Type material: Holotype, male: Ecuador: Sucumbios, Sacha Lodge (76.05°W, 0°.05' S), sampled by Malaise trap, male, 27.8. - 10.9.1994, leg. W. Hibbs (KNHM).
Paratypes: Ecuador: Sucumbios, Sacha Lodge (0°28.14'S, 76°27.35'W), 270 m elevation, sampled by flight intercept trap, male, 21.- 24.3.1999, leg. R. Brooks, #ECU1B99047 (head an pronotum lost) (KNHM); Sucumbios Prov., Sacha Lodge (0.5°S, 76.5°W), 250 m elevation, collected by flight intercept trap, 2 males, 26.- 28.10.2004, leg. G. de Rougemont (UIC); Prov. Napo, Tiputini Res. Stat. (76°09'W, 0°38'S), flight intercept trap, 1 male, 2 females, 5- 25.09.2000, leg. D.J. Inward & K.A. Jackson (BMNH).
Diagnosis: Among the three species of the O.- granarius - group, O. cornifrons resembles O. anceps in the structure of the head. It is distinctly smaller than O. anceps and as large as O. granarius. The aedeagus also resembles O. granarius, but the long acute, hook-like apex is asymmetric.
Description: Length: 6.9 mm. Colouration: Black; legs and antennae dark brown.
Head: 0.93 mm long, 1.34 mm wide; eyes slightly prominent; sides of fore-head shortly emarginate; sides of clypeus parallel; anterior edge of clypeus widely emarginate; anterior angles broadly produced and each ending in short acute tooth; setiferous punctation irregularly dense and moderately deep; on clypeus and at neck denser than on vertex; area at base of antennae impunctate; supraocular punctures granulate; microsculpture distinct; netlike on vertex and clypeus; longitudinally reticulate on impunctate area at base of antennae; surface matt.
Antennae slightly longer than head; second antennomere oval; as long as conical third; following antennomeres approximately quadrate and slightly increasing in width.
Pronotum: 1.35 mm long, 1.38 mm wide; widest at anterior angles; evenly narrowed in smooth curve to posterior angles; posterior angles widely rounded; lateral margin finer in anterior half than in posterior half; in dorsal aspect, not visible slightly behind anterior angles; setiferous punctation large, deep and coarse; punctures much larger than on head; midline impunctate; on average, interstices between punctures half as wide as diameter of punctures; netlike microsculpture deep, but wider than on head; surface slightly shiny.
Elytra: 1.57 mmlong, 1.42 mmwide; setiferouspunctation dense and in irregular rows; coriaceous ground-sculpture weak; punctures distinctly visible; surface more shiny than on pronotum.
Abdomen with dense setiferous punctation; netlike microsculpture on anterior tergites much denser and deeper than on posterior tergites; surface moderately shiny.
Protibia: 0.71 mm long, 0.24 mm wide; thick and nearly semicircular, 10 spines at outer edge; apical spines on short digits; WLR: 1.4; in posterior aspect, inner comb of emargination visible throughout its total length; posterior face with dense setation; on average, setae as long as half of protibial width.
Aedeagus oval; rectangularly angulate; apical lobe triangular, long and asymmetric; apex acute and curved.
Etymology: The specific name is a combination of the epithet cornus meaning horn and frons meaning front of head and refers to the two prominent lobes 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 pages 249-250, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706