Osoriellus trinitatis ( BLACKWELDER, 1943 ), 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 : 308-310

Osoriellus trinitatis ( BLACKWELDER, 1943) new combination

( Figs 103 A-C, 123B)

Osorius trinitatis BLACKWELDER, 1943: 199

Type material examined: Trinidad: Arima, 12 mi. N, female, 23.06.1935, leg. G. Weber (paratype in NMNH) .

Further material examined: Trinidad: Arima (61°16'W, 10°37'N), Blanchisseuse, rotten log on ground, 550 m elevation, male, female, 05.01.1961, leg. T. Clay ( BMNH) ; Aripo (61°15'W, 10°42'N) N. Range, cloud forest, debris among aerial palm roots, 920 m elevation, 2 females, 21.01.1961, leg. T. Clay ( BMNH) ; Panama: La Fortuna, Continental Divide Trail (82°12'0"W, 8°46'0"N); berlesate forest litter, 1200 m elevation, 2 males, 5 females, 9.6.1995, leg. R. Anderson, #PAN2A95 10F ( KNHM, UIC) ; Costa Rica: Heredia, 10 km SE La Virgen (84°05'W, 10°20'N), 450-550 m elevation, female, 17.- 21.3.2003, leg. R. Anderson ( KNHM) ; Heredia, La Selva, 3.2 km SE Puerto Viejo, 100 m elevation, flight intercept trap, female, 17.3.1992, leg. W. Bell ( KNHM) ; Guanacaste, Guanacaste Conservation Area, Patilla Field Station , sampled in cloud-wet montane trans. litter, 1000 m elevation, 1 male, 2 females, 14.2.1996, leg. R. Anderson ( KNHM, UIC) ; Alajuela, E.B. San Ramon, R.B. San Ramon , 27 km N & 8 km W San Ramon (84°35'30"W, 10°13'30"N), 950 m elevation, female, 14.7.1997, leg.

R. Anderdson ( KNHM); Peru: Loreto, Campamento San Jacinto (75°51'77" W, 2°18'75" S), 175-215 m elevation, rainforest berlese, female, 6.7.1993, leg. R. Leschen ( KNHM) ; Loreto, 1.5 km N Teniente Lopez (76°06.92'W, 2°35.66'S), 210-240 m elevation, nr. Ganoderma, female, 21.7.1993, leg. R. Leschen ( KNHM) ; Bolivia: Cochabamba, 117 km E Yungas, Lagunitas (65°40'57"W, 17°6'22"S), flight intercept trap, female, 1.- 6.2.1999, leg. F. Genier ( KNHM) .

Diagnosis: Among the species with digitate protibia and setiferous pronotal punctation, the species resembles O. carinicollis in size and shape of the pronotum, but it has a distinctly finer punctate pronotum. The aedeagus is thick and obtuse at apex, whereas it is thin and acute in O. carinicollis .

Description: Length: 3.1 mm. Colouration: Brown; pronotum and elytra at shoulders reddish; legs, antennae, and anterior margin of clypeus yellow.

Head: 0.37 mm long, 0.58 mm wide; eyes not prominent and as long as temples; sides of fore-head sinuate; anterior edge of clypeus even; without lateral granules; width of anterior edge smaller than width of head in front of eyes; on vertex, setiferous punctation dense and coarse; interstices between punctures half as wide as diameter of punctures; irregular midline impunctate; impunctate midline without microsculpture; surface polished and shiny; on punctate areas of vertex with remains of microsculpture; surface matt or slightly shiny.

Antennae short; slightly longer than head; second antennomere thick and oval; distinctly longer than conical third antennomere; following 3 antennomeres slightly increasing in width and distinctly wider than long; antennomeres 7 to 11 distinctly thicker than preceding antennomeres; antennomere 10 only slightly wider than long.

Pronotum: 0.53 mm long, 0.56 mm wide; widest at anterior angles; sides evenly convergent to posterior widely rounded angles; lateral margin fine; in dorsal aspect, visible throughout its total length; setiferous punctation distinctly finer and sparser than on head; interstices between punctures approximately as wide as diameter of punctures; between normal punctures with sparse micropunctation and weak remains of microsculpture; surface mostly polished and shiny.

Elytra: 0.68 mm long, 0.59 mm wide; ground-sculpture deep and coarse; coarse setiferous punctation nearly invisible in ground-sculpture; surface matt.

Abdomen with coarse setiferous punctation; similar to elytral punctation; surface matt, except impunctate shinier midline.

Protibia: 0.30 mm long, 0.10 mm wide; on outer edge with 8 long spines; 3 apical spines inserted on short digits; WLR: 1.00; posterior face covered with sparse setae; in posterior aspect, inner emargination distinctly visible; in middle, partly covered by posterior inner edge.

Aedeagus with thick apical lobe ending in widely rounded obtuse apex; along inner edge with groups of several sensillae.

Figures

Fig. 103-108: Remaining-species-group: Osoriellustrinitatis (103), O. carinicollis (104), O. sticticus (105), O. acutus (106), O. orbiculatus (107), O. adustus (108); antenna (A), protibia (B), aedeagus in lateral aspect (C); scale bar: 0.1 mm.