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COSEWIC Assessment and Update Status Report on the Dwarf Wedgemussel in Canada

The Dwarf Wedgemussel is a small (up to 55 mm long) freshwater mussel that is roughly trapezoidal in shape. The periostracum is brown or yellowish brown with greenish rays in young or pale-coloured specimens. The nacre is bluish or silvery white and is iridescent in the posterior part of the shell. The hinge teeth are small but distinct. The pseudocardinal teeth are compressed, one or two in the right valve and two in the left. The lateral teeth are gently curved, and there are two teeth in the right valve and one in the left, which is the reverse of the pattern found in other species.

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  • Author: Government of Canada, Environment Canada
  • Language of Document: Separate English/French
  • Document Type: Report
  • Pages: 24
  • Year: 2000