Ambrosiodmus rubricollis (Eichhoff, 1875)

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

Ambrosiodmus rubricollis (Eichhoff, 1875)

Distribution.

Native to the eastern Palaearctic and Oriental regions ( Knížek 2011). Adventive in Europe, Australia, and the Nearctic region (widespread in the United States; Ontario, Canada) ( Knížek 2011; Gomez et al. 2018).

Canadian records.

Ontario: Point Pelee National Park, 11-Jul-2012 to 18-Jul-2012 (1 ex, CBG); Point Pelee National Park, 16-Jun-2014 to 22-Jun-2014 (2 exx, CBG).

Diagnostic information

(based on Gomez et al. 2018). Body length 2.4-2.6 mm. Pronotum with asperities covering entire surface. Elytral declivity with tubercles on interstriae 2 as large as those on interstriae 1 and 3.

Bionomic notes.

Ambrosiodmus rubricollis uses symbiotic fungi to attack many genera of gymnosperm and dicot trees including species in the following Canadian genera: Abies Mill., Aesculus L., Alnus Mill., Carya Nutt., Cornus L., Fraxinus L., Ilex L., Juglans L., Morus L., Pinus L., Populus L., Prunus L., Quercus L., Rhus L. ( Faccoli et al. 2009). One of the Canadian specimens was collected with a Malaise trap in a savanna, the two others were caught with pitfall traps in a swampy forest.

Comments.

This is the only Ambrosiodmus species known from Canada, although two larger-bodied species are known from states bordering southern Ontario ( Gomez et al. 2018). Ambrosiodmus lewisi (Blandford, 1984), and A. tachygraphus (Zimmermann, 1868) can be distinguished from A. rubricollis by their greater body lengths (3.6 to 4.0 mm).