Glyptoma obscuricolle ( BERNHAUER, 1908 )

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 : 317-318

Glyptoma obscuricolle ( BERNHAUER, 1908) : 284

( Figs 14 A, B, C , 22B )

Calocerus obscuricolle BERNHAUER, 1908: 284

Type material examined: female, Holotype: Brazil, without further data of location or collecting ( FMNH).

Further material examined: Brazil: 1 male, 3 females, Santa Catharina, Blumenau, 1889 , leg. A. Hetschko ( NHMW) ; 1 female only with location Santa Catarina ( NHMW) ; 1 female, Santa Catarina, Theresopolis, leg. S. Fruhstorfer ( ZMHU) ; Rio de Janeiro, Floresta de Tijuca , 3 males, 1 female, 17.7.1960, leg. H. Schubart ( UIC) ; 1 male, same location, 17.3.1962, leg. I. Becker & H. Schubart ( UIC) ; 23 specimens, São Paulo, without further data, leg. J. Mráz ( MNHP, AMNH, BMBH, UIC) ; 2 specimens, same location, June 1914, leg. J. Mráz ( MNHP) ; 13 specimens, same location, July 1914, leg. J. Mráz ( MNHP) ; 1 male, 1 female, same location without further data ( BMNH) ; 1 female with only information “ Brazil ” ( BMNH) ; Paraguay: 1 female, Cazaapá, Hermosa, prop. Sosa family, San Rafael Reserve (55°44.55'W, 26°19.15'S), under bark, 90 m elevation, 4.12.2000, leg. Z. Falin #PAR1F00105 ( KNHM) .

Diagnosis: G. obscuricolle ( BERNHAUER, 1908) is the largest species of the group. The vertex of the head is finely punctate, whereas punctures are larger in the other species of the group. The longitudinal micro-striae of the vertex give a characteristic iridescent shine. The smoothly curved aedeagus resembles that of G. schuhi spec. nov., but the apical lobe is shorter and has fewer sensillae.

Description: Length: 3.2 mm, Colouration: Black; elytra slightly lighter, dark brown; legs and antennae still lighter brown.

Head: 0.40 mm long, 0.60 mm wide; eyes slightly prominent; eyes as long as temples; temples smoothly rounded to the neck in convex curve; sides in front of eyes up to base of antennae parallel; parallel part as long as length of eyes; then, abruptly angulate; narrowed to anterior edge of clypeus in sinuate curve; anterior edge of clypeus 2.5 times as wide as distance between base of antennae; clypeus with moderately dense setiferous punctation; on average, interstices between punctures as wide as or wider than diameter of punctures; on vertex punctation sparer than on clypeus; interstices between punctures at least twice as wide as diameter of punctures; microsculpture extremely dense; consisting of diagonal micro-striae pointing to centre of vertex; on central line of vertex micro-striae more or less longitudinal; thus, surface matt, in central area slightly shiny.

Antennae as long as head, pronotum and half of elytra combined; antennomeres slightly widened anteriad; second antennomere slightly narrower than first; slightly wider than long; third to ninth antennomeres approxi- mately quadrate; tenth antennomere again slightly wider than long.

Pronotum: 0.50 mm long, 0.55 mm wide; widest in anterior third; slightly narrowed to anterior angles in smooth convex curve; anterior angles obtuse, but distinct; anterior edge also slightly convex; posteriad narrowed in concave curve to obtusely rounded posterior angels; posterior edge as wide as neck; setiferous punctation coarse and dense; central area less densely punctate; laterally, interstices between punctures restricted to extreme narrow ridges; punctures partly coriaceous; on disc, punctures smaller; interstices between punctures ranging between as wide as or even wider than diameter of punctures; pair of larger punctures in middle of posterior half in front of posterior edge; margined by transverse moon-shaped carinate structure separated by short longitudinal carinae; indistinct transverse depression in middle shortly behind anterior edge; longitudinal micro-striae microsculpture slightly weaker than on head; surface of large punctures with more or less isodiametric microsculpture; surface matt, but slightly shinier than on head.

Elytra: 0.80 mm long, 0.70 mm wide; widest in posterior third; sides slightly curved in convex curve, but nearly parallel; shoulders obtusely rounded; anterior edge margined; discal carinae distinct; slightly curved; lateral carina absent; suture line deeply impressed; marked by small extremely dense punctures; continuing to posterior edge; between suture line and discal carina two irregular rows of large slightly elongate setiferous punctures; punctation of outer row at discal carina denser than of inner row adjacent to sutural line; outer row partly coriaceous; laterad of discal carina another coriaceous row of setiferous punctures; laterally two more irregular rows of sparser punctures; interstices partly restricted to narrow ridges; longitudinally striate microsculpture dense; on surface of large punctures, microsculpture widely isodiametric; surface matt, but still shinier than on pronotum.

Abdomen with irregular transverse rows of large punctures; on average, width of abdominal punctures as wide as width of punctures of inner rows of elytra.

Aedeagus smoothly curved from basal to apical lobe; apical lobe ending in acute apex; apical lobe laterally with two groups of sensillae; one with numerous sensillae at middle and one with four sensillae at base; paramere thin; reaching middle of apical lobe.

Figures

Figs 22: Fore body of Glyptoma nitidum (A), G. obscuricollis (B), G. nitens (C), G. cognatum (D), G. sanctaecatharinae (E), G. klimschi (F); scale bar 0.5 mm.

Figs 13–17: Aedeagus (A), antenna (B) and microsculpture of head (C) ofGlyptoma nitidum (13), G. obscuricolle (14), G. nitens (15), G. cognatum (16), G. denieri (17); scale bar: 0.1 mm.