Osoriellus ocularis, 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 : 238

publication ID

https://doi.org/ 10.21248/contrib.entomol.64.2.231-354



persistent identifier


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scientific name

Osoriellus ocularis

sp. nov.

Osoriellus ocularis View in CoL n. sp.

( Figs 6 View Fig A-D, 11B)

Type material: Holotype, male: Brazil: Pará, Jacareacanga (57°45.38'W, 6°13.24S), X.1959, leg. M. Alvarenga ( INPA). GoogleMaps

Paratypes: Brazil: 1 male, 7 females with same data as holotype ( INPA, UIC) GoogleMaps ; French Guiana: Nason; Marowijne River, Wanaboo (54°26'36"W, 4°43'35"N), flight intercept trap, male, 5.6.1999, leg. Z.H. Falin ( KNHM) GoogleMaps ; Bolivia: Beni, Ilha Flores (63°07'W, 12°46'S), Rio Iténez , 9 females, 9 males, 7.8.1964, leg. J.K. Bouseman & L. Lussenhop ( AMNH, UIC) GoogleMaps ; Beni, Capivara, 30 km E Versales (63°16'W, 12°43'S), female, 22.7.1964, leg. J.K. Bouseman & L. Lussenhop ( AMNH) GoogleMaps ; Beni, Guayaramerin, Fundo Nuevo Cuba, Soil Zoological Expedition , NO. 408, netted from vegetation, 2 females, 22. + 26.11.1966, leg. J. Balogh, L.S. Mahunka, Zicsi ( NMB) .

Diagnosis: Among the species with a crenate front edge of the clypeus, i.e. O. oculatus and O. hanagarthi , the species can identified by its small size in combination with large, prominent eyes. In dorsal aspect, the space between eyes is only 6 times as wide as the diameter of eyes. The teeth at clypeal angles are longer than in O. oculatus and O. hanagarthi . Furthermore, the apical lobe of the aedeagus is longer than in the two other species.

Description: Length: 3.7 – 3.8 mm. Colouration: Head and pronotum dark brown, abdomen, elytra, legs, and antennae light red; elytra at posterior margin indistinctly darker.

Head: 0.65 mm long, 0.80 mm wide; eyes large and prominent; in dorsal aspect, space between eyes 6 times as wide as diameter of eyes; sides of fore-head convergent to front edge of clypeus in even concave curve; front margin of clypeus crenate and with larger teeth at angles; on large supraocular area with dense and coarse setiferous punctation; clypeus with distinctly finer and sparser setiferous punctation, setae yellow and pointing to apical centre; wide area on vertex impunctate and surface polished and shiny; on remaining vertex and on clypeus with distinct netlike microsculpture; surface matt except small shiny area at base of antennae.

Antennae with first antennomere as long as three following ones, second antennomere oval and longer than conical third antennomere; antennomeres four to six more or less quadrate and not wider than preceding antennomeres; following antennomeres distinctly thicker.

Pronotum: 0.67 mm long, 0.75 mm wide; widest at anterior margin; evenly convergent to posterior margin; at posterior angles only two-third as wide as at anterior angles; in dorsal aspect, lateral margin fine; visible in its total length; setiferous punctation coarse and deep; interstices between punctures only one-fourth of diameter of punctures; yellow setae pointing to middle; punctures close to impunctate midline in indistinct rows of up to 9 punctures; without microsculpture, but with sparse micro-punctation; surface shiny.

Elytra: 0.90 mm long, 0.80 mm wide; with coriaceous ground-sculpture; surface less shiny than pronotum; setiferous punctation as coarse and deep as on pronotum; yellow setae pointing distad.

Abdomen densely and deeply punctate; yellow setae pointing distad.

Protibia 0.50 mm long, 0.13 mm wide; moderately thick and with 9 long spines at outer edge; apical spines inserted on short digits; WLR: 3.8; in posterior aspect, inner edge nearly straight and comb covered in middle; posterior face densely covered by long yellow setae.

Aedaegus with long apical lobe; apical lobe even longer than basal lobe and widely rounded at obtuse apex; only two sensillae at lateral inner edge of apex.

Etymology: The specific name derived from the Latin word oculus meaning eye and refers to the large eyes.




Zimbabwe, Bulawayo, Natural History Museum of Zimbabwe


Instituto Nacional de Pesquisas da Amazonia


The Educational Science Museum [=Kuwait Natural History Museum?]


American Museum of Natural History


Naturhistorishes Museum













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