Trixagus carinifrons (Bonvouloir, 1859)

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

Trixagus carinifrons (Bonvouloir, 1859) Figure 25

Distribution.

Native to the Palaearctic region. Widespread in Europe, also recorded from the Russian Far East ( Leseigneur 2007). Adventive in the Nearctic region (Ontario, Canada).

Canadian records.

Ontario: Guelph, 01-Aug-2013 to 08-Aug-2013 (3 exx, CBG); Guelph, 15-Aug-2013 to 22-Aug-2013 (1 ex, CBG); Guelph, 29-Aug-2013 to 05-Sep-2013 (1 ex, CBG); Guelph, 30-Sep-2013 to 04-Oct-2013 (1 ex, CBG); Rouge National Urban Park, 28-May-2013 to 04-Jun-2013 (1 ex, CBG); Rouge National Urban Park, 18-Jun-2013 to 25-Jun-2013 (4 exx, CBG); Rouge National Urban Park, 27-Aug-2013 to 03-Sep-2013 (1 ex, CBG); Rouge National Urban Park, 03-Jun-2014 to 10-Jun-2014 (1 ex, CBG); Rouge National Urban Park, 24-Jun-2014 to 01-Jul-2014 (2 exx, CBG); Rouge National Urban Park, 29-Jul-2014 to 05-Aug-2014 (2 exx, CBG); Rouge National Urban Park, 05-Aug-2014 to 12-Aug-2014 (4 exx, CBG).

Diagnostic information

(based on Leseigneur 1998, 2005). Body length 2.5-3.0 mm. Habitus as in Fig. 25A . Eyes deeply emarginate. Head with longitudinal carinae which converge towards the vertex. Sides of pronotum sinuate in males, slightly or not sinuate in females. Elytral apex in males with a fringe of hairs longer than the lateral pubescence, often hidden under the elytra and not visible without removal of the abdomen. Aedeagus as in Fig. 25B .

Bionomic notes.

In Europe, this species is usually found in dry, warm habitats: heaths, forest edges, gravel pits, etc. ( Koch 1989b). The Canadian specimens were collected in Malaise traps in a patch of forest and on a lawn between buildings on the University of Guelph campus.

Comments.

The genus Trixagus includes several overlooked and probably undescribed species in Canada based on DNA barcode data and initial studies of male genitalia of the barcoded material ( Bouchard et al. 2017, MP unpublished data). Until the genus is revised, the two Palaearctic Trixagus species reported here are most reliably identified using DNA barcodes or male genitalia.

Figures

Figures 25, 26. 25 Trixagus carinifrons (Bonvouloir) 25 A habitus, L. Borowiec 25 B aedeagus 26 Trixagus meybohmi Leseigneur 26 A habitus 26 B aedeagus. Scale bars: 1.0 mm (25 A; 26 A), 0.5 mm (25 B; 26 B).