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

description: Osoriellus francke i (WENDELER, 1955) new combination (Figs 72 A-C, 98A)
Osorius franckei WENDELER, 1955: 197
Type material examined: Brazil: Santa Catarina, Nova Teutonia (52°23'W, 27°11'S), male, leg. F. Plaumann (holotype in ZMHB).
Further material examined:
Brazil: São Paulo, Teodoro Sampaio (52°10.15'W, 22°31.56'S), 2 females, August 1973, leg. F.H. Oliveira (AMNH, UIC); Santa Catharina, Corupa (49°13'W, 26°26'S), Hansa Humboldt, female, Sept. 1948, leg. A. Maller (AMNH).
Diagnosis: Among the species of similar size and without pronotal microsculpture, O. franckei is characterised by the specific punctation of the pronotum. Compared to O. parumpunctatus, the pronotal punctation is denser, compared to O. tuxtlae and O. minor, the pronotal punctation is sparser. The aedeagus is charaterised by its strongly curved long apical lobe with only few sensillae on its inner edge.
Description: Length: 4.4 mm. Colouration: Black; elytra dark reddish-brown; legs and antennae reddish.
Head: 0.59 mm long, 0.90 mm wide; eyes not prominent; slightly longer than temples; sides of fore-head strongly narrowed in concave curve to anterior angles; front edge of clypeus even with short stout granules at angles; setiferous punctation on supraocular area coriaceous, on vertex coarse and dense, and on clypeus slightly sparser than on disc; wide midline impunctate; microsculpture weak, but dense; on supraocular area much denser and surface matter than on vertex; surface on vertex moderately shiny.
Antennae with oblong second antennomere; conical third antennomere as long as second; following three antennomeres approximately quadrate and as thick as preceding antennomeres; antennomeres 7 to 11 distinctly thicker than preceding antennomeres, but also approximately quadrate.
Pronotum: 0.88 mm long, 0.94 mm wide; widest at anterior angles; distinctly convergent to posterior angles in smooth curve; posterior angles smoothly rounded; lateral margin fine; in dorsal aspect, nearly invisible close to anterior angles; setiferous punctures much larger than on head; partly elongate and in irregular rows; row adjacent to impunctate midline consisting of 10 large punctures; on average, interstices between punctures of adjacent rows half as wide as diameter of punctures; distance between punctures within rows only one-fourth as wide as diameter of punctures; with weak netlike microsculpture and with sparse micro-punctation; surface shiny.
Elytra: 0.92 mm long, 0.95 mm wide; with weak coriaceous ground-sculpture; setiferous punctation in irregular rows; surface shiny.
Abdomen with dense setiferous punctation and impunctate midline; yellow setae pointing to midline; with weak netlike microsculpture; surface less shiny than on elytra and pronotum.
Protibia: 0.50 mm long, 0.15 mm wide; with 7 spines at outer edge; WLR: 1.6; in posterior aspect, comb of inner emargination totally visible; posterior face densely covered by yellow setae.
Aedeagus elongately curved; angulate in nearly rectangular angle.
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 268, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706