Acephala

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Acephala

(Science: zoology) 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.

Origin: NL, fr. Gr, adj. Neut. Pl, headless. See acephal.