Ceutorhynchus inaffectatus Gyllenhal, 1837

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

Ceutorhynchus inaffectatus Gyllenhal, 1837 Figure 46

Distribution.

Native to the Palaearctic region. Widespread in Europe, recorded east to Kazakhstan and West Siberia ( Alonso-Zarazaga et al. 2017). Adventive in the Nearctic region (Ontario, Canada).

Canadian records.

Ontario: Guelph, 02-Jun-2018 (1 ex, CBG).

Diagnostic information

(based on Lohse 1983). Body length 2.3-3.9 mm. Habitus as in Fig. 46A , appearing grey at low magnification due to the pale scales sparsely covering the black integument. Antennal funicle with seven antennomeres. Pronotum densely punctate, lateral tubercles absent. Elytra without apical calli, interstriae with narrow scales arranged in two or three longitudinal rows. Meso- and metafemora with small teeth. All tarsal claws with small basal tooth. Aedeagus as in Fig. 46B .

Bionomic notes.

This species feeds on Hesperis matronalis L. and H. tristis L. ( Brassicaceae ) ( Koch 1992). The larvae develop in the seed pods, the adults feed on leaves and other parts of the host plants ( Koch 1992, Larsen et al. 1992). The Canadian specimen was collected by sweep netting vegetation along a recreational trail where H. matronalis is abundant.

Comments.

Ceutorhynchus inaffectatus is similar in habitus to two other Palaearctic species adventive in North America: C. obstrictus (Marsham, 1802) and C. rapae Gyllenhal, 1837. These species have lateral pronotal tubercles, which are absent in C. inaffectatus . The combination of toothed femora, antennal funicle with seven antennomeres, pronotum lacking lateral tubercles and toothed tarsal claws will separate C. inaffectatus from native species of Ceutorhynchus . Hesperis matronalis ( dame’s rocket or purple rocket) is an invasive weed in North America ( Francis et al. 2009), and the strictly specialized C. inaffectatus could potentially be useful in its biological control.

Figures

Figures 46 - 48. 46 Ceutorhynchus inaffectatus Gyllenhal 46 A habitus, L. Borowiec 46 B aedeagus 47 Ceutorhynchus mutabilis Dietz, habitus 48 Exomias trichopterus (Gautier des Cottes) 48 A male habitus, L. Borowiec 48 B female habitus, L. Borowiec. Scale bars: 1.0 mm (46 A; 47; 48), 0.5 mm (46 B).