Osoriellus parcus Irmler 2014, new combination
Creators: name: Irmler, Ulrich
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Osoriellus
Osoriellus parcus

description: Osoriellus parcus (SHARP, 1887) new combination
(Figs 80 A-C, 99E)
Osorius parcus SHARP, 1887: 680
Type material examined: Guatemala: Panzos (89°37'W, 15°24'N), 3 specimens, leg. Champion (syntypes in BMNH).
Further material examined: Mexico: Mexico City (99°07'W, 19°25'N), Desiertos de los Leones D.F. side Rio Mala, 1 specimen, 23.04.1946, leg. J. Pallister (AMNH); San Antonio (92°46'W, 16°16'N), Volcan Tacaná, leaf litter beside Rio Mala, 9 specimens, 20.12.1976, leg. H. Frania (AMNH, UIC); Union Juarez, NW slope Vulc. Tacaná (92°06'43"W, 15°07'58"N), Barranca Providencia, 1540 m elevation, 4 specimens, 25.12.1976, leaf litter flat area nr. stream, montane trop. forest, 1 specimen, 17.12.1975, Sumidero San Antonio, under moss and large rock, montane trop. forest, 1760 m elevation, 1 specimen, 20.12.1975, Pico Gallo, leaf litter, seepage area, montane trop. forest, 1700 m elevation, leg. H. Frania (AMNH); Tamaulipas (98°55'50"W, 21°09'56"N), 6 mi NW Gomez Farias, Ranch del Cielo, human dung traps, 1230 m elevation, 1 specimen, 4.7.1969, leg. J. Peck (AMNH); Palenque (91°58'W, 17°29'N), Ruines, stump litter, 1 specimen, 6.4.1974, leg. C. Alteri (AMNH); Chiapas, Volcan Tacaná, sumidero San Antonio, leaf litter beside Rio Mala, 1760 m elevation, male, 20.12.1976, leg. H. Frania (AMNH); Tamaulipas, shaded sand gravel banks of Nacimento Rio Frio, 4.5 mi SSE Gomez Farias, male, 4.01.1972, leg. H. Frania (AMNH); Chiapas, 2 mi NE Tenejapa, 30 mi ENE Tuxtla Gutierrez, in debris filled cracks of large rocks (92°22' W, 16°50'N), 2300 m elevation, male 30.12.1972, leg. H. Frania (AMNH); Union Juarez (92°04'W, 15°03N), 4 km N, lower slopes, cloud forest litter, 1950 m elevation, 16 specimens, 18.9.1992, leg. R. Anderson (KNHM, UIC); San Luis Potosi, Tlamaya (nr. Xilitla), 1 specimen, 01.09.1991, leg. D. Yanega (KNHM); Motozintla (92°14'W, 15°21'N), 7.4 km SSW, cloud forest litter, 4 specimens, 17.09.1992, leg. R. Anderson (KNHM); Jalapa, 2.3 km S, deep litter in rock cracks, 1320 m elevation, 1 specimen, 18.07.1992, leg. J.S. Ashe (KNHM); Bazóm, Chiapas, Mpio., Huixtán, mixed magnolia/oak forest litter, 1 specimen, 09.07.2003, leg. R. Anderson (KNHM); Guatemala: Quezaltenango, 14.4 km SW Zunil, 1340 m elevation, 1 specimen, 18.06.1993, leg. J.S. Ashe (KNHM); Panzos, 2 specimens without further data, leg. G.C. Champion (AMNH).
Diagnosis: O. parcus is similarly sized as O. sexpunctatus and O. majusculus. In O. sexpunctatus the pronotum is more convergent from anterior angles to posterior angles than in O. parcus. Furthermore, the setiferous punctation of the pronotum is denser than in O. sexpunctatus, and the protibia is strongly digitate at outer edge. Compared to the similar O. rougemonti, O. parcus is larger and the pronotal punctation is denser and the punctures smaller.
Description: Length: 7.2 mm. Colouration: Black; legs and antennae reddish.
Head: 1.00 mm long, 1.50 mm wide; eyes not prominent; angles of clypeus produced to short granules; anterior edge slightly emarginate; setiferous and granulate punctures irregularly dense; moderately wide midline and area at base of antennae impunctate; on average, interstices between punctures as wide as or slightly wider than diameter of punctures; supraocular punctures coriaceous; dense netlike microsculpture distinct; surface slightly shiny.
Antennae with first antennomere slightly shorter than four following antennomeres; second antennomere oblong; longer than wide and nearly as long as conical third; following three antennomeres increasing in width, but decreasing in length; sixth antennomere quadrate; following four antennomeres slightly wider than sixth antennomere; approximately quadrate; last antennomere smaller than penultimate antennomere.
Pronotum: 1.30 mm long, 1.40 mm wide; widest at anterior angles; anterior angles slightly produced to short teeth; evenly convergent to posterior angles; more distinctly convergent in posterior third; lateral margin fine; setiferous punctures distinctly larger than on head and not granulate; along impunctate midline in irregular rows; adjacent to midline punctures partly coriaceous; laterally sparser; on average, interstices between punctures shorter than or as wide as diameter of punctures; fine microsculpture netlike; sparse micro-punctation present. Elytra: 1.50 mm long, 1.50 mm wide; coriaceous groundsculpture; punctures deep, in irregular rows.
Abdomen with dense setiferous punctation and narrow impunctate midline; weak isodiametric microsculpture; surface shiny.
Protibia: 0.79 mm long, 0.35 mm wide; 10 spines on outer edge; apical 4 spines on short digits; WLR: 1.40; in posterior aspect; comb at inner emargination visible throughout its total length; posterior face with moderately dense setation.
Aedeagus with slender apical lobe widely curved to acute apex; at inner edge of apical lobe slightly sinuate at base.
description: Published as part of Irmler, Ulrich, 2014, The Neotropical species of the genus Osoriellus FAGEL, 1959 (Coleoptera: Staphylinidae: Osoriinae), pp. 231-354 in Beiträge Zur Entomologie = Contributions to Entomology 64 (2) on pages 281-282, DOI: 10.21248/contrib.entomol.64.2.231-354, http://zenodo.org/record/5461706