COSEWIC Status Reports

COSEWIC Assessment and Status Report on the Brook Floater Alasmidonta varicosa in Canada

The Brook Floater, Alasmidonta varicosa (Lamarck, 1819), is a medium-sized freshwater mussel (50-65 mm long) with a kidney-shaped shell that is swollen in cross section. The shell is relatively thin, with a small patch of tiny ridges on the posterior edge that run perpendicular to the growth lines, creating a corrugated appearance. It is yellowish, greenish or brownish to black in colour, often with broad dark rays running from the top to the bottom. The Brook Floater has a cantaloupe-coloured foot that can be seen when the valves are still gaping as live individuals are removed from the water.


Get Adobe Reader

Contact Person(s)

COSEWIC Secretariat
c/o Canadian Wildlife Service
Environment Canada
Ottawa, ON
K1A 0H3
Tel: 819-938-4125
Fax: 819-938-3984
Send e-mail

Related Species


  • No links available.