- 1. n. pl. That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca. Source: opted
- 2. That division of the Mollusca which includes the bivalve shells, like the clams and oysters; -- so called because they have no evident head. Formerly the group included the Tunicata, Brachiopoda, and sometimes the Bryozoa. See Mollusca. Source: webster
- 3. That division of the Mollusca which includes the bivalveshells, like the clams and oysters; -- so called because they have noevident head. Formerly the group included the Tunicata, Brachiopoda,and sometimes the Bryozoa. See Mollusca. Source: adambom
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acephala
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molluscabecausebrachiopodabryozoacalledclamsdivisionformerlygroupheadincludedincludeslikeoystersseesometimestheytunicatabivalveevidentshells