Glyptoma simile, Irmler, 2015

Irmler, Ulrich, 2015, The neotropical genus Glyptoma ERICHSON, 1839 with descriptions of new species and a key to the species (Coleoptera: Staphylinidae: Osoriinae), Beiträge Zur Entomologie = Contributions to Entomology 65 (2), pp. 297-325 : 304-305

Glyptoma simile spec. nov.

( Figs 6A, B , 20E )

Type material: male Holotype: Brazil: Rio de Janeiro, leg. Squires, Sharp coll. # 1905-313 ( BMNH) . Paratypes: Brazil: 2 females with same data as holotype ( BMNH) ; 2 males, 2 females, without further data ( BMNH) ; male, Rio de Janeiro, Sumaré , 23.11.1962, leg. H. Schubart ( UIC) ; male, same location, 29.5.1960, leg. H. Schubart & J. Becker ( UIC) ; 4 females, Rio de Janeiro, Floresta de Tijuca , 17.7. & 27.7.1960, leg. H. Schubart ( UIC) ; Suriname: female, Marowijne, Nassau Mountain (54°36.20'W, 4°48.56'N), 480 m elev., under bark, 3.6.1999, leg. Z. Falin, #SUR1 F99017 ( KNHM) ; French Guiana: female, Roura , 8.4 km SSE (52°13.25'W, 4°4041'N), 200 m elev., under bark, 23.5.1997, leg. J. Ashe & R. Brooks, #FG1AB97008 ( KNHM) ; Guyana: female, Region B, Iwokrama Forest, Pakatau hills (59°01.36'W, 4°44.54'N), 70 m elev., under bark, 28.5.2001, leg. R. Brooks & Z. Falin, #GUY1BF01052 ( KNHM) ; female, same region, 26 km SW Kurupukari, Iwokrama Mt. , base camp, (58°48.38'W, 4°20.17'N), 60 m elev., under bark, 24.5.2001, leg. R. Brooks & Z. Falin, #GUY1BF01019 ( KNHM) ; female, same region, Kabocalli Field Stn. (58°30.35'W, 4°17.4'N), 60 m elev., under bark, 4.6.2001, leg. R. Brooks & Z. Falin, #GUY1BF01029 ( KNHM) ; Paraguay: 2 females, Cazzaapa, Hermosa, prop. Lopez family, San Rafael Reserve (55°44.29'W, 26°18.56'S), 80 m elev., under bark, 1.12.2000, leg. Z. Falin #PAR1F00081 ( KNHM) .

Diagnosis: The species resembles G. opacum ( SHARP, 1876) in size, microsculpture and matt surface. It can be easily distinguished from that species by the shinier clypeus of the head. Furthermore, the aedeagus is wider and with numerous lateral sensillae on apical lobe, whereas the aedeagus of G. opacum ( SHARP, 1876) is thin and without lateral sensillae.

Description: Length: 3.6–3.8 mm. Colouration: Black; antennae dark brown; legs slightly lighter brown.

Head: 0.49 mm long, 0.65 mm wide; eyes slightly prominent; slightly longer than temples; temples narrowed to neck in smooth convex curve; post-ocular part shortly parallel; cheek-like; sides in front of eyes parallel up to base of antennae; anterior edge of clypeus sinuate; central prominent part one third as wide as total width between base of antennae; punctation dense; on vertex partly coriaceous; on clypeus and at base of antennae punctation weaker and sparser; on vertex, surface of punctures and ridges between punctures with dense and deep isodiametric microsculpture; on clypeus, microsculpture weaker; in particular, ridges between punctures shiny.

Antennae as long as head, pronotum and half of elytra combined; first antennomere nearly rectangular, slightly longer than wide; second antennomere narrowed and shorter; wider than long; following antennomeres slightly wider than second; approximately quadrate and with long setae; setae nearly as long as width of antennomeres.

Pronotum: 0.61 mm long, 0.66 mm wide; widest in anterior half; anterior half slightly curved in convex curve, but nearly parallel; posterior half deeply emarginate; at obtuse posterior angles as wide as mesonotum; anterior angles widely rounded; densely and deeply punctate; large punctures in irregular longitudinal rows; on average, interstices less than one third as wide as diameter of punctures; mostly restricted to small ridges between punctures; isodiametric microsculpture deep and dense; totally covering surface including surface of punctures; at posterior angles punctures combined to indistinct impression; surface matt.

Elytra: 0.87 mm long, 0.84 mm wide; widest at middle; shoulders widely rounded; shortly denticulate; sides smoothly curved to obtuse posterior angles; discal carinae distinct; lateral carinae irregular and indistinct; partly absent; punctation deep and dense; large punctures partly coriaceous; interstices restricted to small ridges; surface totally covered by deep isodiametric microsculpture; surface matt.

Abdomen on segments III to VI with large punctation similar to that of elytra; segments VII and VIII with finer punctation; on each segment several punctures with long setae; remaining punctures with short setae; segments III to VI with dense and deep isodiametric microsculpture; surface matt; segments VII and VIII with weak microsculpture; surface moderately shiny.

Aedeagus with basal lobe and apical lobe forming nearly rectangular angle; apical lobe at inner side slightly sinuate near apex; acute apex pointing ventrally; laterally with numerous sensillae; sensillae denser at apex than close to basal lobe; paramere elongate; reaching apical third of apical lobe; at apex of paramere with one long seta; few sensillae near base of paramere.

Etymology: The species name derived from the same Latin word meaning similar and refers to the similarity to G. opacum ( SHARP, 1876) .

Figures

Figs 20: Fore body of Glyptoma laeviceps (A), G. cicatricosa (B), G. rossii (C), G. opacum (D), G. simile (E); scale bar 0.5 mm.

Figs 2–6: Aedeagus (A), antenna (B) and microsculpture of head (C) of Glyptoma laeviceps (2), G. opacum (3), G. cicatricosa (4), G. rossii (5), G. simile (6); scale bar: 0.1 mm.