Glyptoma rossii, 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 : 303-304

Glyptoma rossii spec. nov.

( Figs 5A, B, C , 20C )

Holotype: male: Ecuador: Cotopaxi, Canton Sigichos, Las Pampas, Otonga Natural Reserve (78°53'W, 0°41.49'S), 25.– 28.7.2005, leg. W. Rossi ( UIC) . Paratypes: Ecuador: female, Pichincha, Nanegalito, 7 km S on Nono Road (78°40.36'W, 0°00.23'N), 1540 m elev., flight intercept trap, 27.– 31.10.1999, leg. Z. H. Falin ( KNHM); 6 males, 2 females , Cotopaxi, Canton Sigichos, Las Pampas, Otonga Natural Reserve (78°53'W, 0°41.49'S), 25.– 28.7.2005, leg. W. Rossi ( VAC, UIC, AMNH) .

Diagnosis: The species is very similar to G. cicatricosa and G. laeviceps . On average, it is slightly longer than G. laeviceps . In contrast to G. laeviceps with polished head, G. rossii has fine micro-striae on posterior head, which make a slight iridescent shine. However, the micro-striae are less dense than in G. cicatricosa . In the last species the iridescent shine on the posterior head is still more distinct. The species can be mainly distinguished from G. cicatricosa by the distinct lateral carina of the elytra, which is nearly absent in G. cicatricosa . In this respect, it resembles G. laeviceps that also carries a distinct lateral carina on the elytra. The elytral microsculpture is denser than in G. cicatricosa and G. laeviceps , in particular, on the interstices between punctures. Interstices between punctures are totally matt in G. rossii , but sligthly shiny in G. laeviceps and G. cicatricosa . The aedeagi of G. rossii and G. cicatricosa are also very similar, but can be differentiated by the shorter paramere in G. cicatricosa .

Description: Length: 3.8–4.0 mm. Colouration: Black; antennae dark brown; legs slightly lighter brown.

Head: 0.55 mm long, 0.72 mm wide; moderately large and prominent; slightly smaller than temples; temples narrowed to neck in smooth convergent curve; posterior margin of head slightly emarginate; sides in front of eyes parallel up to base of antennae; then abruptly narrowed to front margin of clypeus in sinuate concave curve; clypeus less than half as wide as width of head; punctation sparse; interstices between punctures at least four to three times as wide as diameter of punctures; between normal large punctation with denser micro-punctation; few setiferous punctures on fore-head; microsculpture weak or absent; in lateral posterior parts slightly denser consisting of longitudinal or transversal micro-striae; partly shiny, partly with slight iridescent shine.

Antennae as long as head and pronotum combined; first antennomere rectangular; longer than wide; second antennomere quadrate and narrower than first; following antennomeres wider and approximately as wide as first; longer than wide; seventh antennomere 1.5 times as long as wide; tenth antennomere again approximately quadrate; antennomeres five to eleven with long setae; setae approximately as long as width of antennomeres.

Pronotum: 0.56 mm long, 0.66 mm wide; widest at middle; narrowed to anterior margin in smooth convex curve; narrowed to posterior margin in smooth concave curve; shortly in front of anterior margin with deep emargination continuing to neck-like front margin; punctation deep and dense; punctures large; interstices between punctures less than one fourth of diameter of punctures; partly punctation coriaceous without distinct interstices between punctures; in anterior half with longitudinal groove; in posterior half with transverse v-shaped groove; at posterior lateral emargination with oval groove; surface totally covered with dense and deep isodiametric microsculpture; matt.

Elytra: 0.99 mm long, 0.93 mm wide; widest at middle; sides curved in smooth convex curve from shoulders to posterior angles; shoulders obtusely rounded and without distinct denticle; discal and lateral carinae totally developed; margined by transverse ridge in front of posterior margin; between suture and discal carina with irregular large punctures; directly at inner side of discal carinae, punctures in longitudinal line and with short setae; area between discal and lateral carina without punctation except at inner side of lateral carina; longitudinal line of punctures at inner side of lateral carina; surface totally covered by dense and deep isodiametric microsculpture; matt.

Abdomen at base of segments III to V with transverse line of deep and large punctures forming a deep transverse groove; groove deepest on segment III and weaker on segment V; segments VI to VIII without transverse groove at base; without normal punctation; isodiametric microsculpture deep; deeper and narrower on segment III to V than on segment V to VIII; thus, surface of anterior segments matter than on posterior segments; segments V to VIII with few fine setiferous punctures.

Aedeagus with long and thick apical lobe placed in nearly rectangular angle to basal lobe; apical lobe with numerous sensillae laterally; sensillae denser near apex than at middle; base of apical lobe without sensillae; paramere long; reaching apical third of central apical lobe; with seta at apex.

Etymology: The specific name derived from the collector.

Figures

Figs 20: Fore body of Glyptoma laeviceps (A), G. cicatricosa (B), G. rossii (C), G. opacum (D), G. simile (E); scale bar 0.5 mm.

Figs 2–6: Aedeagus (A), antenna (B) and microsculpture of head (C) of Glyptoma laeviceps (2), G. opacum (3), G. cicatricosa (4), G. rossii (5), G. simile (6); scale bar: 0.1 mm.