Glyptoma guadelupense (WENDELER, 1930)

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 : 308-309

Glyptoma guadelupense (WENDELER, 1930)

( Figs 11A, B , 21E )

Calocerus guadelupensis WENDELER, 1930: 182

Type material examined: 1 male, 2 female syntypes: Guadeloupe: Trois Riviere, without further data, leg. Dufeau, ( ZMHU) .

Diagnosis: Among the species of the G. crassicorne -group, G. guadelupense (WENDELER, 1930) is characterised by the short elytra that are wider than long. Moreover, the pseudo-punctures of the elytra are combined to large deep impressions covered by a wide netlike microsculpture. In contrast to the other species of the group, the head is without microsculpture and shiny. The apical lobe of the aedeagus is widened in the apical half similar as in G. amazonense spec. nov. But sensillae were only found in the basal half, whereas in G. amazonense spec. nov. they were found in the apical half.

Description: Length: 2.4 mm; Colouration: Dark brown, elytra slightly lighter brown; legs still lighter yellowish brown.

Head: 0.40 mm long, 0.45 mm wide; eyes small; not prominent; temples 1.5 times as long as eyes; supraocular groove from posterior edge of eyes to neck; sides in front of eyes parallel up to base of antennae; parallel part twice as long as length of eyes; then angulate in nearly rectangular angle; narrowed to anterior edge of clypeus in deep concave curve; anterior edge of clypeus half as wide as distance between base of antennae; setiferous punctation moderately deep; interstices between punctures ranging from as wide as diameter of punctures to three times as wide as diameter; clypeus with weak transversely striate microsculpture; vertex without microsculpture; surface polished.

Antennae as long as head and pronotum combined; all antennomeres approximately equally wide; second and third antennomere quadrate; fourth nearly twice as wide as long; following antennomere 1.5 times wider than long; second to tenth antennomere with long yellow setae; setae nearly as long as width of antennomeres.

Pronotum: 0.43 mm long, 0.47 mm wide; widest at anterior half; slightly narrowed in smooth convex curve to anterior angles; anterior angles obtusely rounded; narrowed to posterior angles in deep concave curve; posterior angles obtusely rounded; pseudo-punctures extremely deep and large; in most parts coriaceous; interstices between punctures restricted to narrow ridges; at midline with two pairs of pseudo-punctures; each pair nearly combined to one pseudo-puncture separated only by very low and narrow ridge at base; anterior pair smaller than posterior pair; very few setiferous punctures on ridges between pseudo-puncture; surface of pseudo-punctures with coarse widely meshed netlike microsculpture; surface of ridges without microsculpture; surface moderately shiny.

Elytra: 0.48 mm long, 0.52 mm wide; widest close to posterior margin; slightly narrowed to shoulders; shoulders smoothly rounded to deeply sinuate anterior edge; discal carina distinct; irregularly sinuate; lateral carina weaker and partly cut by large pseudo-punctures; broad suture stripe deeply impressed; continued to posterior margin; between suture stripe and discal carina with one longitudinal line of four to five large pseudo-punctures; between discal carina and lateral carina irregular pattern of pseudo-punctures; interstices between pseudopunctures restricted to extremely narrow ridges; partly, pseudo-punctures combined to larger pattern of deep grooves; few setiferous punctures on ridges between pseudo-punctures; surface of suture stripe and pseudopunctures with coarse deep netlike microsculpture; surface of ridges and carinae without microsculpture; surface moderately matt.

Abdomen at base of segments with transverse row of deep large pseudo-punctures forming irregular transverse grooves; at posterior edge of segments another narrow transverse impression; on ridges between pseudo-punctures few setiferous punctures; with similar coarse and deep microsculpture as fore-body; surface moderately matt.

Aedeagus angulate between basal and apical lobe; angle obtuse; apical lobe broad; ventral edge of apical lobe deeply sinuate; few sensillae at base of apical lobe and on thin paramere; paramere reaching only 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.