Osoriellus hanagarthi, 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 : 237

Osoriellus hanagarthi n. sp.

( Figs 8 A-D, 11A)

Type material: Holotype, male: Peru: Huanuco, Panguana (74°56'W, 9°37'S), Cocha, male, 6.-9.1975, leg. W. Hanagarth ( UIC).

Paratypes: from the same location, 4 females, June – Sept. 1975, Oct. 75 - Jan. 1976, leg. W. Hanagarth; river margin, female, 26.12.1975, leg. W. Hanagarth ( UIC); Madre de Dios, Iberia , 160 m elevation, female, 30.4.1947, leg. J.C. Pallister; Huanuco, Tingo Maria, 670 m elevation, male, 29.12.1946, leg. J.C. Pallister ( AMNH); Madre de Dios , Puerto Maldonado , 1 female, 6.1.1984, leg. L. Huggert ( SMNH); Venezuela: Aragua, Rancho Grande Biological Station , 28 km N (67°41.0'W, 10°28.0'N), km 48, 120 m elevation, male, collected by flight intercept trap VEN1P94, 22.6.- 18.7.1994, leg. T. Phillips ( KNHM) .

Diagnosis: The species resembles O. ocularis and O. oculatus in the crenate structure of the clypeus. In contrast to these two species, the eyes of O. hanagarthi are shorter and not produced. Moreover, the apical lobe of the aedeagus is shortly rounded at apex and much short than in the two other species.

Description: Length: 4.0 – 4.2 mm. Colouration: Black, legs and antennae yellow.

Head: 0.50 mm long, 0.80 mm wide; eyes approximately as long as temples, not prominent; sides of fore-head evenly convergent to anterior angles; anterior edge crenate with slightly produced teeth at angles; setiferous punctures deep and large; setae pointing to middle; punctation dense on supraocular area nearly coriaceous; interstices between punctures not wider than one fourth as wide as diameter of punctures; wide midline and area at base of antennae impunctate; without microsculpture; surface polished and shiny.

Antennae with first antennomere more or less as long as following two antennomeres; second antennomere oval; conical third antennomere slightly shorter than second; following three antennomeres not wider than second and quadrate; antennomeres 7 to 11 much thicker than preceding antennomeres; antennomere 10 slightly wider than long.

Pronotum: 0.75 mm long, 0.80 mm wide; widest at anterior angles; evenly convergent to posterior angles; slightly emarginate in posterior half; posterior angles obtuse; lateral margin very fine; in dorsal aspect, not visible in anterior half; setiferous punctation irregular; punctures slightly larger and deeper than on head; on both sides of impunctate midline with row of 12 punctures; dense punctation between midline and lateral margin, but few areas with sparser punctation; without microsculpture, but with sparse micro-punctation; surface polished.

Elytra: 0.95 mm long, 0.80 mm wide; with deep coriaceous ground-sculpture; setiferous punctures in rows; nearly invisible in coarse ground-sculpture.

Abdomen deeply and densely punctate; setae short, pointing to middle; with impunctate and shiny midline.

Protibia 0.50 mm long, 0.15 mm; outer edge with 9 spines; apical spines on short digits; WLR: 2.7; inner edge nearly straight; in posterior aspect, comb at inner emargination visible throughout its total length; posterior face covered by thick setae.

Aedeagus thick with obtuse apex; few sensillae at inner edge of apical lobe.

Etymology: The species is named to its collector and my dear friend Dr. Werner Hanagarth, who unfortunately passed too early.

Figures

Fig. 6-10: Osoriellus-oculatus-group: Osoriellus ocularis (6), O. oculatus (7), O. hanagarthi (8) O. sexdentatus (9) O. denticornis (10); antenna (A), protibia (B), aedeagus in lateral aspect (C), anterior edge of clypeus (D); scale bar: 0.1 mm.