Osorius sublaevis, BERNHAUER

Irmler, Ulrich, 2010, The Neotropical species of the genus Osorius G - M, 1829 with remarks to the Neotropical Osoriid complex (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 60 (2), pp. 363-426 : 403-406

Osorius sublaevis, BERNHAUER ,, 1920: 9 (Figs 18 a-c)

Type material examined:

Paraguay: 1 male, without further data, leg. C. Bruch (holotype, FMNH) .

Diagnosis:

O. sublaevissublaevis can be distinguished from the similarly smaller-sized O. costaricensis , O. verhaaghi and O. paganus by the denser and deeper punctation on the pronotum. The species most distinctly resembles O. laevicollislaevicollis in size and punctation of the pronotum, but anterior angles in O. sublaevis are acuminate, whereas they are obtuse in O. laevicollis . Apical part of aedeagus in O. sublaevissublaevis is widely curved, whereas it is shortly curved in O. laevicollis .

Description:

Length: 7.5 mm. Colour: black; legs light red.

Head :: 1.2 mm long, 1.5 mm wide; sparse but distinct punctation; distance between punctures on average two times wider than diameter of punctures; isodiametric ground sculpture distinct; surface dull; front edge of clypeus obtusely prominent; on inner side with one setiferous puncture; eyes not prominent; several setae in front of eyes, two supraocular setae, and one seta between postocular seta and neck.

AntennaeAntennae with 3 rd antennomere slightly longer than 2 nd; 4 th and 5 th antennomeres slightly longer than wide; subsequent antennomeres globular.

Pronotum: 1.5 mm long, 1.7 mm wide; distinctly narrowed from front angles to posterior angles, and with narrow lateral margin; margin at posterior angles nearly as wide as at anterior angles; front angles distinctly tooth-like prominent; punctation considerably finer than on head; distance between punctures on average at least three times wider than diameter of punctures; with wide smooth midline in posterior half; isodiametric ground sculpture distinct; similar as on head and also with dull surface.

Elytra: 1.5 mm long, 1.6 mm wide; with coriaceous surface; punctures scarcely visible; surface moderately shiny; distinctly shinier than on head and pronotum.

Abdominal tergites nearly impunctate; except one lateral seta on each abdominal tergite.

Front legs at apical outer margin with three longer spines followed by three shorter spines; an additional apical tooth pointing outwards.

Aedeagus elongate with a long apical part ending in an acute apex.

Osorius tschirnhausi sp. n. (Figs 25 a-d, 37 B)

Type material:

Holotype, male: Venezuela: Maracay (67°35' W, 10°14' N), Parque National, coastal mountains, male, 26.3.1998, M. v. Tschirnhaus ( UIC).

Paratypes: 1 male, 1 female with same data as holotype ( UIC); Aragua, Rancho Grande Biol. Stn., Portachelo Pass (67.41 W, 10.21 N), 1100 m elevation , 1 female, 14.5.1998, leg. J.S. Ashe, R. Brooks & R. Hanley, # VEN1ABH98, 037, collected in sifted leaf litter near creek ( KU) .

Diagnosis:

The species can be easily identified by the conspicuous shape of the clypeus with a pair of long, second teeth mediad to the normal pair of broad lateral prominence. The aedeagus is similar to O. continentalus , O. boops , and O. wasmanniwasmanni in its slender shape and resembles, in particular, that of O. continentalus .

Description:

Length: 9.5 - 10.0 mm. Colour: black.

Head :: 1.3 mm long, 1.7 mm wide; eyes slightly prominent; sides of clypeus in front of eyes deeply emarginate; thus, angles of clypeus nearly rectangular; front edge of clypeus with a pair of broad, obtuse teeth and mediad a second pair of more acute teeth; punctation irregularly dense; lateral parts of clypeus densely punctate; distance between punctures on average half as wide as diameter of punctures; on disc, distance between punctures at least twice as wide as diameter of punctures; with numerous supraocular granular setiferous punctures; neck very densely, nearly coriaceously punctate; with dense isodiametric microsculpture; surface slightly shiny.

AntennaeAntennae with 2 nd antennomere globular; 3 rd conical antennomere nearly twice as long as 2 nd, subsequent antennomeres only slightly increasing in width and, at least, slightly longer than wide.

Pronotum 1.8 mm long, 2.2 mm wide; widest at anterior acute angles; continuously narrowed in a smooth curve to posterior angles; shortly in front of posterior angles a distinct emargination; lateral margin narrow in anterior half and distinctly widened at posterior emargination; punctation as deep as on head, but more regularly dense; distance between punctures on average as wide as diameter of punctures and only in few parts with wider punctation; at posterior angles a finer and denser punctation; microsculpture similar to head; surface slightly shiny.

Elytra: 2.4 mm long, 2.2 mm wide; with coriaceous ground sculpture and with indistinct sparse punctation.

Aedeagus elongate with a discontinued, long apical part ending in an acute apex.

Etymology:

The species is dedicated to its collector Dr. Michael von Tschirnhaus, Bielefeld, Germany, who kindly collected this species for my studies even though he is mainly interested in flies.

Osorius venezuelanus sp. n. (Figs 15 a-c, 36 C)

Type material:

Holotype, male: Venezuela: Lara Sanare , 14.4 km SE. Yacambu N.P. (9°42 '22 ' ' N, 69°34 '42 ' ' W), 1500 m elevation, male, 16 May 1998, leg. R. Anderson, #VEN1A98 012D, collected in cloud forest litter ( KU).

Paratypes: 1 male, 2 females with same data as for holotype ( KU, UIC) .

Diagnosis:

The species is similar to O. costaricensiscostaricensis in size and isodiametric microsculpture of pronotum. O. venezuelanusvenezuelanus is on average even slightly smaller than O. costaricensis . O. venezuelanus can be distinguished from O. costaricensis by the specific shape of the clypeal front edge. The large inner tooth of the lateral prominence resembles the structure in O. tschirnhausi , and looks bidentate in dorsal aspect. Moreover, the aedeagus of O. venezuelanus is much narrower than the aedeagus of O. costaricensis and resembles that of O. tschirnhausi .

Description:

Length: 6.2 – 6.5 mm. Colour: black.

Head :: 0.8 mm long, 1.2 mm wide; eyes not prominent and slightly shorter than temples; front edge of clypeus with broad lateral denticulate prominence; gap between outer tooth and inner teeth deep and wide and with a setiferous puncture; emargination between lateral prominences more or less straight; punctation on disc much sparser than laterad; on disc, distance between punctures as wide as or wider than diameter of punctures; laterad, punctation much denser, partly coriaceous; a large supraocular space with numerous granular punctures; isodiametric microsculpture distinct; surface slightly shiny.

Antennae with oval 2 nd antennomere and conical 3 rd antennomere; equal in size; subsequent antennomeres increasing in width; penultimate antennomeres more or less quadrate.

Pronotum: 1.25 mm long, 1.4 mm wide; widest at tooth-like prominent front angles; sides continuously narrowed from anterior to posterior angles; only indistinctly emarginate in front of posterior angles; lateral margin narrow in anterior half; distinctly widened in posterior half; punctation moderately dense and deep; distance between punctures on average as wide as diameter of punctures; posterior half of midline without punctures; isodiametric microsculpture distinct, as on head; surface slightly shiny.

Elytra: 1.5 mm long, 1.4 mm wide; with distinct punctation; punctures on average slightly larger than on pronotum, but sparser; distance between punctures on average two times wider than diameter of punctures; isodiametric microsculpture dense and deep, more distinct than on head; surface less shiny than on pronotum.

AedeagusAedeagus elongate; long apical part laterally depressed and ending in an obtuse apex.

Etymology:

The species name derives from the country’s name where it was collected.

Osorius verhaaghi sp. n. (Figs 13 a-c, 36 A)

Type material:

Holotype, male: Peru: Huanuco, Panguana (74° 56 ' W, 9 ° 37' S), male, 26.5. – 3.6.1984, leg. M. Verhaagh, collected by pitfall trap ( UIC).

Paratype: female collected in rain forest, Aug-Sept. 1975, leg. W. Hanagarth ( UIC) .

Diagnosis:

O. verhaaghi can be easily identified by the shape and surface of the pronotum. The lateral margin, visible throughout its total length, and the deep microsculpture, producing a matte surface, is characteristic for the species. Eyes E are slightly prominent, but less prominent than in O. boops and O. affinis . In contrast to O. boops , the clypeus and the lateral sides of pronotum are less emarginate in O. verhaaghi . Furthermore, the pronotal surface is slightly shiny in O. boops , but matte in O. verhaaghi .

Description:

Length: 6.5 mm. Colour: dark brown.

Head :: 0.8 mm long, 1.4 mm wide; eyes slightly prominent; sides in front of eyes deeply emarginate; front edge of clypeus slightly emarginate; without distinct lateral prominences; with several supraocular granular punctures; punctation on disc moderately deep and dense; on average, distances between punctures as wide as or shorter than diameter of punctures; a granular setiferous puncture near posterior edge of eyes and another mediad one; setae extremely long; isodiametric microsculpture deep and dense; surface matte.

AntennaeAntennae as long as head and half of pronotum combined; with 2 nd antennomere oblong; approximately twice as long as wide; 3 rd antennomere nearly twice as long as 2 nd; subsequent antennomeres increasing in width; 4 th antennomere still longer than wide; subsequent antennomeres more or less quadrate.

Pronotum: 1.3 mm long, 1.5 mm wide; widest at anterior angles; anterior angles slightly projecting into a short tooth; sides straightly narrowed to obtusely rounded posterior angles; without emargination in front of posterior angles; lateral margin narrow and visible throughout total length in dorsal aspect; widened only in posterior third; punctation distinctly finer and sparser than on head; distance between punctures on average at least twice as wide as diameter of punctures; a setiferous puncture in posterior third near lateral margin and two further setiferous punctures near anterior angles; isodiametric microsculpture dense and deep; surface matte.

Elytra: 1.6 mm long, 1.5 mm wide; with almost rectangular shoulders forming slightly prominent angles; punctation deep and partly coriaceous, but still individual punctures visible; distance between punctures at least three times wider than diameter of punctures; isodiametric microsculpture dense, but less deep than on pronotum; surface slightly shiny.

Abdomen with very fine and sparse punctation and microsculpture; surface shiny.

Aedeagus elongate with a long, laterally depressed apical part ending in an obtuse apex.

Etymology:

The species is dedicated to its collector Dr. M. Verhaagh, who collected the species during his research on ants in Panguana, Peru.