Osorius puncticeps SHARP , 1887: 678

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 : 398-400

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https://doi.org/ 10.21248/contrib.entomol.60.2.363-426

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Osorius puncticeps SHARP , 1887: 678


Osorius puncticeps SHARP, 1887: 678 View in CoL ( Figs 33 View Fig a-c)

Type material examined:

Mexico: Cordoba , 1 male, 1 female without further data (syntypes, BMNH) .

Additional material examined:

Mexico: Mexico, 4 specimens without further data ( BMNH, ZMUK) ; Mexico, 1 specimen, Eppelsheim Steind. without further data ( AMNH) ; Veracruz, Jalapa (92°48' W, 17°42' N), 1 specimen without further data, leg. W. Schaus ( AMNH) GoogleMaps ; 1.1 km S on Coatepec road, under bark, 1280 m elevation, 6 specimens, 12.7.1992, leg. J.S. Ashe ( KU, UIC) ; 2.3 km S. Jalapa , forest litter, 1 specimen, 1320 m elevation, 1 specimen, 13.7.1990, leg. J.S. Ashe ( KU) ; 1.7 km W Huatusco (96° 57' W, 19°08' N), under bark, 1250 m elevation, 3 specimens, 11.7.1990, leg. R. Leschen ( KU) GoogleMaps ; 7 km E Huatusco, Hwy 125, leaf litter/fruitfall, 1 specimen, 1230 m elevation, 16.7.1990, leg. J.S. Ashe ( KU) ; Fortin de las Flores (97°00' W, 18°90' N), 1 specimen, 2.1.1989, leg. Danforth ( KU) , Hidalgo, Tlanchinol (98°65' W, 20°98' N), 4.4 km N., Hwy 105, under bark, 1420 m elevation, 1 specimen, 6.7.1992, leg. J.S. Ashe ( KU) ; San Luis Potosi, 3 km E Xilitla (91°37' W,A 6°36' N), under bark,F00 m elevation,C specimens,F.7.,G.7. andI.7.1990 GoogleMaps ,

leg. J.S. Ashe ( KU); Tlamaya (nr. Xilitla ), 1 specimen, 24.8.1988 , leg. D. Yanega ( KU); Chiapas, Lago de Montebello (91°40' W, 16°06 ' N), Cinco Lagos, Liquidamber oak pine forest litter, 1500 m elevation, 1 specimen, 22.9.1992 GoogleMaps , leg. R. Anderson ( KU); Misantla (96°51.0 W, 19°56.4 N), Salvador Díez Mirón, Bosque mesófilo de montana, 2 specimens, 17.04.1999, 05.07.1997 GoogleMaps , leg. J. Marquez ( UNAM); Cordoba (96°55 W, 18°53 N), Camino a Plan de Ayala, Loma Chica , Bosque mesófilo de montana, ex tronco caido, 1330 m elevation, 3 specimens, 17.04.1999 GoogleMaps , leg. J. Marquez ( UNAM); Xicotepec de Juárez (97°57.29 W, 20°16.32 N), Hydroeléctrica Patla, Selva mediana, ex troncos caidos, 460 m elevation, 1 specimen, 5.10.2002 GoogleMaps , leg. J. Marquez ( UNAM); Huayacocotla (98°23.31 W, 20°41.13 N), San Antonio, Bosque mesófilo de montana, en tronco, 2 specimens, 17.10.2006 GoogleMaps , leg. J. Marquez ( UNAM); Xilitla (98°59 W, 21°22 N), San Luis Potosi, Las Pozas de James, Selva mediana, en troncos con hongos, 585 m elevation, 1 specimen, 18.07.2007 GoogleMaps , leg. J. Marquez ( UNAM); Hidalgo, Tamaulipas (98°55.50 W, 21°09.56 N), Chapulhuacán, Bosque mesófilo de montana, troncos podridos, 3 specimens, 3.7.2003 GoogleMaps , leg. J. Marquez ( UNAM).


The species is very similar to O. nitens , O. propinquus , and O. confusus . It can be distinguished from O. nitensnitens and O. propinquus by the more narrowed pronotum, with the front edge more than 1.3 times wider than the posterior edge. Compared to O. confusus the distinct longitudinal stria is absent and the apical part of the aedeagus is much longer.


Length: 11.0 mm. Colour: black, tarsi and antennae dark red.

Head :: 1.80 mm long, 2.30 mm wide; short eyes not prominent; temples twice as long as eyes; front edge of clypeus with an obtuse, wide prominence at each outer angle and in central part; lateral prominence denticulate and with short setae; punctation distinct and irregularly dense; partly coriaceous, but on average distance between punctures half as wide as diameter of punctures; a fine micro-punctation present; impunctate at base of antennae and a small space on posterior disc; partly with very weak, netlike microsculpture; surface polished.

AntennaeAntennae with 1 st antennomere as long as four subsequent ones; 2 nd antennomere short and oblong, half as long as conical 3 rd one; subsequent four antennomeres increasing in width, but still longer than wide; antennomeres 8 to 10 quadrate.

Pronotum: 1.90 mm long, 2.50 mm wide; widest at anterior angles forming a short prominent tooth; distad distinctly narrowed; lateral margin narrow at anterior angle; distinctly broadened to posterior angles; punctures deep and larger than on head, but of similar density; on average, distance between punctures half as wide as diameter of punctures; at anterior edge and along smooth impunctate midline with finer and sparser punctation; with weak, netlike microsculpture, but surface polished.

Elytra: 2.30 mm long, 2.45 mm wide; with deep coriaceous ground sculpture; irregular rows of punctures scarcely visible; punctures more distinct at sides and ground sculpture weaker.

AedeagusAedeagus is nearly circular with a long acuminate apical part.

Osorius pusillus n. sp. (Figs 16 a-c, 36 D, 38 E)

Type material:

Holotype, male: Peru: Huanuco, Panguana (74°56' W, 9°37' S), male, 18.2.1984, leg. M. Verhaagh, rain forest, # Pwa 6 ( UIC). GoogleMaps

Paratypes: 1 female, 1 male, rain forest, 21.1. – 18.2.1984, leg. M. Verhaagh ( UIC) .


This is the smallest species of the Neotropical OsoriusOsorius known. It is smaller than O. venezuelanus , but resembles that species in the microsculpture of the pronotum and the numerous granulate supraocular punctures. In contrast to O. venezuelanus , a second distinct tooth is not developed at front edge of clypeus in O. pusillus .


Length: 6.0 mm. Colour: black; antennae reddish; femur dark red; tibia and tarsi lighter red.

Head :: 0.8 mm long, 1.1 mm wide; eyes not prominent; sides in front of eyes slightly emarginate to front angles of clypeus; anterior edge of clypeus widely emarginate and with a pair of short teeth; with granular punctures and striae on a supraocular and postocular space; two supraocular setiferous punctures; two setiferous punctures on each side of central disc and several setiferous punctures on clypeus; three preocular setiferous punctures; discal setae long, clypeal setae short; punctation irregularly dense; a central space near neck, a space at base of antennae and at front margin of clypeus impunctate; discal punctures large, but not deep; with dense micro-reticulation; microsculpture indistinct; surface shiny.

AntennaeAntennae slightly longer than head; with 2 nd antennomere oblong; 3 rd antennomere conical and not longer than 2 nd; subsequent antennomeres increasing in width; 4 th antennomere longer than wide; subsequent antennomeres more or less quadrate.

Pronotum: 1.1 mm long, 1.25 mm wide; widest at anterior angles; anterior angles tooth-like and prominent; lateral margin narrow at anterior angles, widened in posterior half; posterior angles widely rounded in an obtuse angle; punctation distinct; distance between punctures on average as wide as or slightly wider than diameter of punctures; an impunctate midline throughout total length; a setiferous puncture in posterior third; distance of puncture to lateral margin shorter than to posterior margin; isodiametric microsculpture more distinct than on head, but still not deep; surface shiny.

Elytra: 1.3 mm long, 1.3 mm wide; with coriaceous ground sculpture; sparse punctation; nearly invisible in deep ground sculpture.

Abdomen nearly impunctate; only with few setiferous punctures; isodiametric microsculpture moderately deep; surface as shiny as on pronotum.

Aedeagus pear-shaped with moderately long apical part ending in an obtusely acuminate apex.


The specific name derives from the same Latin word and refers to the small size of the species.


American Museum of Natural History


Biodiversity Institute, University of Kansas


Universidad Nacional Autonoma de Mexico














Osorius puncticeps SHARP , 1887: 678

Irmler, Ulrich 2010

Osorius puncticeps

SHARP, D. 1887: 678
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