Exomias trichopterus (Gautier des Cottes, 1863)

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

Exomias trichopterus (Gautier des Cottes, 1863) Figure 48

Distribution.

Native to the Palaearctic region. Widespread in Central Europe ( Alonso-Zarazaga et al. 2017). Adventive in the Nearctic region (Ontario, Canada).

Canadian records.

Ontario: Rouge National Urban Park, 24-Jun-2017 to 25-Jun-2017 (1 ex, CBG).

Diagnostic information

(based on Rheinheimer and Hassler 2013). Body length: 2.7-3.4 mm. Habitus as in Fig. 48A, B . Body brown to black, covered with fine semi-erect to erect setae, legs pale yellow to red-brown. Rostrum with shallow longitudinal depression dorsally. Globose elytra with humeral angles obsolete. Elytra lacking row of long setae near suture on posterior half.

Bionomic notes.

This common European species is polyphagous on herbaceous plants ( Balalaikins 2011) and could become a new pest of berry crops in Canada (see Kolov and Korotyaev 2017).

Comments.

Exomias trichopterus is very similar in appearance to E. pellucidus pellucidus (Boheman, 1834), another adventive Palaearctic species which is common and widespread in North America. Both species were previously placed in the genus Barypeithes Jacquelin du Val, 1854. The former subgenus Exomias was elevated to the generic level by Borovec (2013). Exomias pellucidus pellucidus can be diagnosed primarily by the noticeably denser setae on their elytra, especially near the apex where an additional row of long setae is present along the elytral suture.

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).