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COSEWIC assessment and status report on the Rocky mountain ridged mussel Gonidea angulata in Canada

Summary of Status Report

Gonidea angulata is near the northern end of its range in southern British Columbia, and it likely persists in each of the known locations in B.C., and perhaps other smaller tributaries of the Okanagan River, such as Park Rill Creek, where this species was found, although dead shell only, in 2002. The genus may be monospecific; angulata has or had an extensive range from southern British Columbia to southern California and much of southern Idaho and extreme northern Nevada. Gonidea angulata populations appear to be declining in numbers and in number of breeding individuals over much of the historic range. Proposed habitat restoration and river course realignment for the Okanagan River could negatively impact current G. angulata populations.