Osoriellus multipunctatus, 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 : 279-280

Osoriellus multipunctatus n. sp.

( Figs 87 A-C, 101C)

Type material: Holotype, male: Ecuador: Pichincha, Mindo , 10.6 km W. Mindo Road (78°45.14'W, 0°04.23'S), 1375 m elevation, 26.- 29.3.1999, leg. R. Brooks, D. Brzoska, #ECU1899065, ex. flight intercept trap ( KNHM).

Paratype: Bolivia: Cochabamba, Cochabamba, 109 km E Yungas ( Cochabamba-Villa Tunari Rd. ) (65°42.54'W, 17°08.52'S), flight intercept trap, female, 8.- 12.2.1999, leg. F. Genier, #BOL1G99060 ( UIC) .

Diagnosis: The species can be differentiated from the other similarily sized species by the large prominent eyes and the densely punctate pronotum. It closely resembles O. triangulatus . But the eyes in O. triangulatus are not prominent, the punctation of the pronotum is less dense and the shape of the body is more slender than in O. multipunctatus .

Description: Length: 4.8 mm. Colouration: Dark brown, legs and antennae lighter brown.

Head: 0.57 mm long, 0.97 mm wide; eyes large; twice as long as temples; sides of fore-head strongly convergent; anterior edge of clypeus only half as wide as interstice between eyes; anterior edge of clypeus even; setiferous punctation coarse and dense; on average, interstices between punctures less than half as wide as diameter of punctures; short central area on posterior vertex and at base of antennae impunctate; netlike microsculpture dense and distinct; surface slightly shiny.

Antennae longer than head and half of pronotum combined; second antennomere oblong; third conical and as long as second; fourth antennomere slightly longer than wide; following antennomeres increasing in width, but all quadrate.

Pronotum: 0.90 mm long, 0.99 mm wide; widest shortly behind anterior angles; anterior angles produced to extremely short acute granules; sides evenly convergent to widely ronded posterior angles; lateral margin fine; in dorsal aspect, visible throughout its total length; setiferous punctation coarse and dense, but not coriaceous; on average, interstices between punctures less than half as wide as diameter of punctures; wide midline impunctate; between setiferous punctures with sparse micro-punctation; netlike microsculpture weaker than on head; surface slightly shiny.

Elytra: 1.13 mm long, 1.09 mm wide; with dense coriaceous ground-sculpture; dense setiferous punctation nearly invisible in ground-sculpture.

Abdomen with moderately dense setiferous punctation; netlike microsculpture still weaker than on pronotum; surface moderately shiny.

Protibia: 0.58 mm long, 0.18 mm wide; 9 spines on outer edge; WLR: 1.70; in posterior aspect, comb at inner emargination shortly covered in central part; posterior face densely coverd by yellow setae.

Aedeagus with moderately thick apical lobe ending in obtuse apex; seven sensillae at inner edge of apical lobe.

Etymology: The specific word is a combination of the Latin words multi meaning many and punctatus meaning punctate and refers to the densely punctate pronotum.

Figures

Fig. 84-89: Osoriellus-s. str.-group: Osoriellus rougemonti (84), O. tunariensis (85), O. haitiellus (86), O. multipunctatus (87), O. verhaaghi (88), O. rubripennis (89); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.