Calyptomerus dubius (Marsham, 1802)

Pentinsaari, Mikko, Anderson, Robert, Borowiec, Lech, Bouchard, Patrice, Brunke, Adam, Douglas, Hume, Smith, Andrew B. T. & Hebert, Paul D. N., 2019, DNA barcodes reveal 63 overlooked species of Canadian beetles (Insecta, Coleoptera), ZooKeys 894, pp. 53-150 : 53

Calyptomerus dubius (Marsham, 1802) Figure 20

Distribution.

Native to the Palaearctic region, widespread in Central Europe and around the Mediterranean ( Endrödy-Younga 1961, Löbl 2006). Adventive in the Afrotropical region (South Africa), the Australian region (Australia) ( Endrödy-Younga 1974) and in the Nearctic region (British Columbia, Canada).

Canadian records.

British Columbia: Abbotsford, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG); Vancouver, 22-Sep-2014 to 03-Oct-2014 (1 ex, CBG); Victoria, 03-Sep-2014 to 10-Sep-2014 (1 ex, CBG).

Diagnostic information

(based on Endrödy-Younga 1961). Body length 1.1-1.6 mm. Habitus as in Fig. 20A . Red-brown, with the edges of pronotum and elytra paler. The antennal groove forms a continuous and even curve with the side of the frons in front of the eyes. Lateral edges of pronotum bluntly angled. Pubescence on the dorsal surface long and sparse. Elytra angled apicolaterally and truncate at the hind margin. Aedeagus as in Fig. 20B .

Bionomic notes.

This species is known from decaying plant material. It has been collected from dead, fungus-infested logs of deciduous trees, leaf litter, composts, moldy hay, etc. ( Koch 1989b). The Canadian specimens were collected with Malaise traps in residential areas.

Comments.

Calyptomerus oblongulus (Mannerheim, 1853) is the only other representative of this genus known from North America. It is larger than C. dubius (body length 1.8-2.0 mm), with a rounded angle between the antennal groove and the lateral margin of frons, rounded lateral edges of pronotum, evenly curved (not truncate) elytral hind margins, shorter and denser pubescence on the dorsal surface, and different male genitalia ( Endrödy-Younga 1961).

Figures

Figures 20, 21. 20 Calyptomerus dubius (Marsham) 20 A habitus, L. Borowiec 20 B aedeagus, dorsal view 21 Clambus simsoni Blackburn 21 A habitus 21 B aedeagus, ventral view. Scale bars: 0.5 mm (20 A; 21 A), 0.2 mm (20 B), 0.1 mm (21 B).