Osoriellus germanus ( SHARP, 1887 ) 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 : 299-300

Osoriellus germanus ( SHARP, 1887) new combination

( Figs 110 A-C, 124B)

Osorius germanus SHARP, 1887: 680

Type material examined: Guatemala: Capetillo , 1 female, leg. Champion (holotype in BMNH) .

Further material examined: Mexico: Oaxaca, San Felipe, Mt. Mex. (96°46'W, 18°09'N), female, 16.- 17.9.1947, leg. B. Malkin ( AMNH) ; Oaxaca, Oaxaca City , stream bank in tropical forest (partly sifting), male, 20.11.1989, leg. R. Baranowski ( SMNH) ; Mexico, without further data ( NHMP) ; Nuevo Leon, 37 km SW Linares, 4.8 km S on Busque Escuela Rd (99°54'W, 24°42'N), 1300 m elevation, under stones/leaves, 3 specimens, 21.3.1991, leg. R. Brooks, R. Leschen ( KNHM, UIC) ; Chiapas, Mpio, San Christobal de las Casas , Reserva Huitepec (92°40.96'W, 16°45.09'N), 2450 m elevation, lower cloud forest litter, 1 specimen, 13.11.2001, leg. R. Anderson ( KNHM) .

Diagnosis: O. germanus resembles the complex of similar species of the South Mexican-Guatemalan region, i.e. O. mexicanus , O. brevipennis , and O. cordovensis . However, it is conspicuously larger than these species. Additionally, it differs from O. brevipennis by the absence of microsculpture on the head. The species resembles, in particular, O. mexicanus in punctation and polished surface of the head, but O. mexicanus has no protibial digits. In contrast to O. mexicanus , the pronotal anterior angles are produced to long teeth.

Description: Length: 6.8 mm. Colouration: Black; legs and antennae reddish.

Head: 0.80 mm long, 1.30 mm wide; eyes slightly prominent; nearly as long as temples; angles of clypeus with granules; setiferous punctures moderately large and dense; large area at base of antennae impunctate; on average, interstices between punctures as wide as diameter of punctures; close to neck punctation denser; punctation on temples and on supraocular area very dense, granulate and partly coriaceous; isodiametric microsculpture extremely weak; surface on disc nearly polished; laterally matt due to dense coriaceous punctation.

Antennae with second antennomere slightly longer than wide; third antennomere not longer than second, but conical; antennomeres 4 to 6 slightly smaller than preceding antennomeres, but quadrate; following 4 antennomeres wider and approximately quadrate.

Pronotum: 1.25 mm long, 1.45 mm wide; widest at anterior angles; evenly convergent to obtuse posterior angles; lateral and posterior margin fine; punctation distinct and as fine and sparse as on vertex of head; interstices between punctures at least as wide as diameter of punctures; irregular midline impunctate; between coarser punctures with extreme sparse micro-punctation; surface without microsculpture and polished.

Elytra: 1.55 m long, 1.50 mm wide; setiferous punctation coarse; much denser and deeper than on pronotum; with fine coriaceous ground-sculpture; surface shiny, but less shiny than pronotum.

Abdomen with dense setiferous punctation; midline impunctate; surface with netlike microsculpture; slightly shiny; in particular, on anterior tergites; two posterior tergites with less dense microsculpture and shinier than anterior tergites.

Protibia: 0.85 mm long, 0.31 mm wide; thick; nearly semi-circular; 8 spines on outer edge; apical 3 spines on long digits; WLR: 0.50; in posterior aspect, comb at inner emargination covered in apical half; posterior face sparsely covered by yellow setae.

Aedeagus angulate in nearly rectangular angle; apical lobe very slender; ending in acute apex; at inner edge of apical lobe with row of 9 sensillae.

Figures

Fig. 109-113: Remaining-species-group: Osoriellus cordovensis (109), O. germanus (110), O. notmani (111), O. opacinotus (112), O. sexpunctatus (113); antenna (A), protibia (B), aedeagus in ventral and lateral aspects (C); scale bar: 0.1 mm.