| Term | Definition |
| EQUIVALVE |
In bivalves, having each VALVE equal in size and shape; see also: EQUILATERAL; INEQUIVALVE. See other bivalve shapes. |
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| INEQUIVALVE |
In bivalves, having one valve that is larger (as in the genera Anadara and Corbula) or more convex (as in the genus Pecten) than the other valve. See also: EQUIVALVE; MARGIN, DISCORDANT. See other bivalve shapes. Photo: Anadara brasiliana (Lamarck, 1819) |
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