Glyptoma amazonense, 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 : 305-306

Glyptoma amazonense spec. nov.

( Figs 10A, B , 21D )

Type material: male, Holotype: Brazil, Amazonas , Manaus, 26 km NE of Manaus, Reserva Ducke, collected by flight intercept trap, 1995–1996, #BMNH{E} 2003-84 ( BMNH) ; Paratypes: 2 females with same data as holotype ( BMNH) ; same location, 25 km NNE Manaus , under bark in secondary forest, 120 m elev., female, 26.7.1973, leg. R. T. Schuh ( AMNH) .

Diagnosis: The species mostly resembles G. guianense spec. nov. The differentiating characters between the two species are listed there.

Description: Length: 2.5–2.6 mm. Colouration: Black; legs and antennae dark brown; tarsi lighter yellow brown. Head: 0.35 mm long, 0.49 mm wide; eyes prominent; nearly twice as long as temples; temples behind eyes slightly narrowed; nearly parallel; then, shortly narrowed to neck; cheek-like; posterior edge triangularly emarginate; adjacent to eyes with short groove; sides in front of eyes parallel up to base of antennae; parallel part approximately 1.5 times as long as eyes; then abruptly narrowed in sinuate curve to anterior edge of clypeus; anterior edge of clypeus one third as wide as distance between base of antennae; pseudo-punctures large and slightly elongate; in irregular transverse lines; first line between base of antennae consisting of 6 punctures; interstices between pseudo-punctures restricted to narrow ridges; few setiferous punctures on clypeus and on ridges between pseudo-punctures; longitudinal groove behind eyes dividing vertex from temples; groove deeper at neck than close to eyes; isodiametric microsculpture deep and wide; surface matt.

Antennae slightly longer than head and pronotum combined; width of antennomeres slightly increasing from second antennomere to apical antennomeres; second antennomere slightly narrower that first and nearly twice as wide as long; third antennomere nearly quadrate; following antennomeres slightly wider than long; second to tenth antennomeres with few long yellow setae; setae as long as width of antennomeres.

Pronotum: 0.40 mm long, 0.46 mm wide; widest near middle; narrowed to anterior angles in smooth convex curve; anterior angles widely rounded; narrowed posterior angles in distinct concave curve; posterior angles obtusely rounded; with extremely deep pseudo-punctures; thus, in dorsal aspect lateral edge denticulate; on disc, pseudo-punctures deeper and larger than laterally; close pair of large pseudo-punctures near middle; behind this pair another pair of still larger punctures separated by bulge in width of anterior pair; mostly, interstices between pseudo-punctures restricted to narrow ridges; few setiferous punctures on ridges; at posterior angles with deep impression; coarse microsculpture isodiametric; on disc, partly finer and longitudinal; surface matt.

Elytra: 0.60 mm long, 0.59 mm wide; widest in middle; sides slightly curved from shoulders to obtuse posterior angles, but nearly parallel; shoulders distinct; obtusely rounded; anterior edge slightly concave; discal and lateral carinae indistinct; lateral carina nearly absent; suture line deep; continuing at posterior edge to posterior angles; between suture line and discal carina two irregular rows of pseudo-punctures; between discal carina and lateral carina three irregular rows of pseudo-punctures; pseudo-punctures extremely large; interstices between pseudo-punctures irregularly wide; partly restricted to narrow ridges; partly half as wide as diameter of pseudopunctures; few setiferous punctures on ridges between pseudo-punctures; irregular microsculpture distinct; mostly meshes isodiametric, partly longitudinal; within suture line, microsculpture denser; total surface matt.

Abdomen with one transverse row of large pseudopunctures; setiferous punctures on ridges between pseudo-punctures; microsculpture distinct; surface matt. Aedeagus with nearly rectangular angle between basal lobe and apical lobe; apical lobe sinuate in front of acute apex; several sensillae laterally; paramere short and thin with short apical seta.

Etymology: The species name derived from the Brazilian state Amazonas, where the species was found.

Figures

Figs 21: Fore body of Glyptoma crassicorne (A), G. lescheni (B), G. guianense (C), G. amazonense (D), G. guadelupense (E), G. hirticorne (F); scale bar 0.5 mm.

Figs 7–12: Aedeagus (A) and antenna (B) of Glyptoma crassicorne (7), G. lescheni (8), G. guianense (9), G. amazonense (10), G. guadelupense (11), G. hirticorne (12); scale bar: 0.1 mm.