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

Existing Protection or Other Status

Global Status: G3

G3 = Vulnerable

Gonidea angulata is considered to be vulnerable globally either because it is very rare and local throughout its range, found only in a restricted range (even if abundant at some locations), or because of other factors making it vulnerable to extinction. G3 species typically have 21 to 100 occurrences or between 3,000 and 10,000 individuals.


Provincial Status: S1S3

The exact status of G. angulata in British Columbia is unknown; however, it is currently believed to be at least vulnerable and it may be endangered. More work is required to determine the extent of this taxon in British Columbia.


Red List

The provincial red list includes any indigenous species or subspecies that have, or are candidates for Extirpated, Endangered, or Threatened status in British Columbia.

Currently, this taxon has no special protection in the U.S. However, Frest and Johannes (1995b, in press) recommended it for protection on the Eastside Forest Planning Area (Interior Columbia Basin). Frest and Johannes (2001) suggested it should be monitored carefully and considered for protection if further deterioration occurs in ID populations.