Glyptoma hirticorne SHARP, 1887

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 : 310

Glyptoma hirticorne SHARP, 1887

( Figs 12A, B , 21F )

Glyptoma hirticorne SHARP, 1887: 724

Type material examined: 2 male, 3 female syntypes: Guatemala: Capetillo, leg. Champion ( BMNH) .

Diagnosis: G. hirticorne SHARP, 1887 is the smallest species of the group with pseudo-punctures on the pronotum. Concerning the shiny head and pronotum it resembles G. guadelupense (WENDELER, 1930) . It can be easily identified by the distinctly convergent discal carinae of the elytra and by the dense setation of the antennomeres.

Description: Length: 2.3 mm. Colouration: Dark brown to black; elytra slightly lighter, but still dark brown; legs lighter brown; tarsi yellowish.

Head: 0.30 mm long, 0.39 mm wide; eyes slightly prominent; as long as temples; temples narrowed to neck in smooth convex curve; sides in front of eyes parallel; parallel part slightly longer than eyes; angles at base of antennae widely rounded; narrowed to anterior edge of clypeus in sinuate curve; anterior edge of clypeus approximately half as wide as distance between base of antennae; setiferous punctation sparse and moderately deep; interstices between punctures irregular, but at least as wide as diameter of punctures; without microsculpture; surface shiny.

Antennae as long as head and pronotum combined; second and third antennomeres slightly narrower than following antennomeres; wider than long; fourth to tenth antennomere equally wide; tenth antennomere twice as wide as long; third to tenth antennomere covered by long yellow setae; setae slightly shorter than width of antennomere.

Pronotum: 0.32 mm long, 0.34 mm wide; widest near middle; narrowed to widely rounded anterior angles in smooth convex curve; narrowed to posterior obtusely angled angles in concave curve; pseudo-punctures large; symmetric on both side of midline; three closely adjacent pairs; smaller one in anterior half; larger and smaller one in posterior half; between anterior pair and larger posterior pair with moderately wide impunctate area; on remaining area, interstices between pseudo-punctures restricted to small ridges; at posterior angles combined to irregular impression; setiferous punctation on ridges between pseudo-punctures; surface of pseudo-punctures with netlike microsculpture; ridges with remnants of microsculpture; surface moderately shiny;

Elytra: 0.54 mm long, 0.48 mm wide; widest in middle, but approximately parallel; shoulders widely rounded to emarginate anterior edge; with discal carina distinct; lateral carina absent; discal carinae convergent anteriad; suture line narrow; continued to posterior margin; betweensuturelineanddiscalcarinawithirregularpattern of pseudo-punctures; in posterior part partly coriaceous; laterad of discal carinae with rows of pseudo-punctures; interstices between pseudo-punctures irregular, but approximately half as wide as diameter of pseudo-punctures; setiferous punctation restricted to ridges; remnants of microsculpture longitudinally striate; laterad to discal carinae partly more distinct than between suture line and discal carinae; surface moderately shiny.

Abdomen densely covered by large pseudo-punctures; ridges between pseudo-puncture still narrower than on pronotum and elytra; on posterior segments sparser than on anterior segments; setiferous punctation on ridges between pseudo-punctures.

Aedeagus with nearly rectangular angle between basal and apical lobe, apical lobe abruptly narrowed to acute apex in apical third; close to apex sinuate; group of four sensillae at lateral base of apical lobe and two pairs of sensillae closer to apex; endophallus with obtuse angle at half of apical lobe; paramere short; ending approximately at end of basal third of apical lobe.

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.