Glyptoma nitens ( 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 : 315-316

Glyptoma nitens ( BERNHAUER, 1908)

( Figs 15A, B, C , 22C )

Calocerus nitens BERNHAUER, 1908: 284

Calocerus reichenspergi SCHEERPELTZ 1970 , 135 new synonymy

Type material examined: male, Holotype: Brazil: São Paulo, leg. A. Barbiellini ( FMNH).

G. reichenspergi SCHEERPELTZ, 1970: 1 female syntype: São Paulo, Mogy das Cruzes, 1.5.1917, leg. J. Mráz (NHMW); 1 female syntype of G. reichenspergi, Blumenau , leg. P. Witte (NHMW).

Further material examined: Brazil: São Paulo, 31 specimens, leg. J. Mráz ( MNHP, AMNH, UIC) ; Rio de Janeiro, Floresta da Tijuca , 6 males, 8 females, 17.07.1960, leg. H. Schubart ( UIC) ; same location, 1 male, 6 females, 17.03.1962, leg. J. Becker & H. Schubart ( UIC) ; same location, 2 females, 1.8.1960, leg. H. Schubart ( UIC) ; same location, 1 female, Caminho do Rio do Papageio , 16.7.1959, leg. H. Schubart ( UIC) ; same location, 1 female, Estrada do Sumaré , 6.7.1960, leg. H. Schubart ( UIC) .

Diagnosis: The species resembles G. nitidum (BERN- HAUER, 1908) by its shiny surface. But G. nitens is larger and the elytral punctures are more numerous and much coarser. SCHEERPELTZ (1970) published that G. reichenspergi should be 3.25 mm long. My own measurements of the two syntypes of G. reichenspergi revealed a length of 2.8–2.9 mm. I found no other characters to distinguish G. reichenspergi from G. nitens . Therefore, I synonymise G. reichenspergi with G. nitens .

Description: Length: 2.6–2.9 mm, Colouration: Brown, elytra reddish, legs light brown.

Head: 0.40 mm long, 0.50 mm wide; eyes slightly prominent; as long as temples; temples smoothly rounded to neck; sides in front of eyes up to base of antennae parallel; parallel part slightly longer than length of eyes; then, abruptly narrowed in sinuate curve to anterior edge of clypeus; width of anterior edge of clypeus half as wide as width between base of antennae; setiferous punctation dense and coarse; interstices between punctures less than half as wide as diameter of punctures; on vertex partly wider; without microsculpture; surface polished.

Antennae as long as head and pronotum combined; all antennomeres equal in width; only second antennomere slightly narrower than the following; second antennomere nearly twice as wide as long, third antennomere wider than long, but nearly quadrate; penultimate antennomeres slightly less than twice as wide as long; antennomere two to ten with long yellow setae; setae approximately as long as width of antennomeres.

Pronotum: 0.40 mm long, 0.50 mm wide; widest in anterior third; narrowed to anterior edge in smooth convex curve; anterior edge also slightly prominent in convex curve; in posterior half narrowed to posterior angles in deep concave curve; setiferous punctation coarse and deep; partly coriaceous; laterally denser than on disc; in middle of disc with smaller punctures and with varying large impunctate area; surface of punctures with coarse isodiametric microsculpture; remaining surface without microsculpture; impunctate areas on disc and ridges between punctures polished; lateral and posterior parts less shiny.

Elytra: 0.60 mm long, 0.60 mm wide; widest in posterior third; sides smoothly rounded; shoulders obtuse, but distinct; anterior edge slightly concave; discal carina distinct; posteriad more or less distinctly curved; pointing to suture; lateral carina indistinct; suture line consisting of small dense partly coriaceous punctures continuing to posterior edge; between suture line and discal carina two irregular rows of setiferous punctures; between discal carina and lateral carina two rows of setiferous punctures; punctation denser and more regular than between suture and discal carina; setiferous punctures large and with isodiametric microsculpture; remaining surface without microsculpture; polished.

Abdomen with transverse rows of large setiferous punctures; punctures as large as on elytra; surface of setiferous punctures with isodiametric microsculpture, in particular, in punctures at base of each abdominal segment; surface between punctures polished.

Aedeagus smoothly curved from basal to apical lobe; continuously narrowed to apex; apex shortly rounded; apical lobe with numerous sensillae from apical third to near base; paramere 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.