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: 238-239

publication ID

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

persistent identifier

http://treatment.plazi.org/id/E01A87D0-FFCA-FFCC-4DEA-FF1DFEC6FB66

treatment provided by

Felipe

scientific name

Osoriellus ocularis
status

n. sp.

Osoriellus ocularis   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.

Osoriellus oculatus ( SHARP, 1876)   new combination ( Figs 7 View Fig A-D, 11C)

Osorius oculatus SHARP, 1876: 386  

Type material examined: Brazil: Tefé (64°41'W, 3°21'S), without further data (holotype BMNH) GoogleMaps   .

Further material examined: Brazil: Mato Grosso, Cáceres (54°42'W, 16°03'S), 3 females, 7 males, 2./ 4.12.1955, leg. M. Alvarenga ( UIC) GoogleMaps   .

Diagnosis: Within the O.- oculatus   -group, the species is characterised by its prominent eyes and the 3 short teeth on each side of the middle at anterior edge of the clypeus. The punctation of the pronotum is similar as in O. hanagarthi   , but the shape of the pronotum is different. In O. oculatus   , the pronotum is more deeply sinuated shortly in front of the posterior angles than in O. hanagarthi   . The aedeagi are very similar in O. oculatus   and O. hanagarthi   , but the apex of the aedeagus in O. hanagarthi   is obtuse, whereas it is acute O. oculatus   .

Description: Length: 4.2 – 4.7 mm. Colouration: Dark brown; legs and antennae reddish.

Head: 0.60 mm long, 0.85 mm wide: with large and prominent eyes; eyes at least half as long as temples; angles of clypeus produced to short teeth; adjacent to tooth two smaller granules; middle not granulate, but slightly produced; clypeus and disc densely and coarsely punctate; interstices between punctures almost one-fourth as wide as diameter of punctures; large supraocular and indifferent area on vertex impunctate; surface moderately shiny; on parts of vertex indistinct weak microsculpture present.

Antennae with oblong second antennomere; third antennomere conical; one-fourth shorter than second; antennomeres 4 to 6 quadrate and equal in width; antennomeres 7 to 11 much wider and longer than preceding ones, slightly wider than long.

Pronotum: 0.80 mm long, 0.85 mm wide; widest at anterior angles, in anterior two-third slightly narrowed; in posterior third more strongly convergent to posterior angles; posterior angles obtusely rounded; lateral margin fine; in dorsal aspect, not visible at anterior angles; surface with large and deep setiferous punctures; interstices between punctures approximately half as wide as diameter of punctures; at each side of wide impunctate midline with row of 10 to 11 punctures partly forming coriaceous furrow; without microsculpture, but with sparse micro-punctation; surface shiny.

Elytra: 1.0 mm long, 0.90 mm wide; with dense, partly coriaceous setiferous punctures; punctures forming irregular rows; punctation laterally sparser than on disc; surface shiny, but partly with weak coriaceous groundsculpture.

Abdomen with dense setiferous punctation; setae pointing to middle; interstices between punctures less than one-fourth of diameter of punctures.

Protibia 0.48 mm long, 0.17 mm wide; with 9 spines at outer edge; apical spines inserted on short digits; WLR: 2.1; in posterior aspect, comb at inner emargination visible, but partly covered in apical part; on posterior face with dense setation.

Aedeagus stout with short apical lobe and four sensillae at inner edge.

INPA

Instituto Nacional de Pesquisas da Amazonia

KNHM

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

AMNH

American Museum of Natural History

NMB

Naturhistorishes Museum

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Osoriellus

Loc

Osoriellus ocularis

Irmler, Ulrich 2014
2014
Loc

Osorius oculatus

SHARP, D. 1876: 386
1876