Cardinal cell see triangle

cardinal costa (MOLL: Bivalvia) A ridge marking the cardinal area from the outer face of the shell.

cardinal crura (MOLL: Bivalvia) Narrow teeth radiating from the apex of the ligament pit.

cardinales The cardines. see cardo.

cardinalia a. [L. cardinalis, pert. to a hinge] (BRACHIO) Outgrowths of the secondary shell in the posteromedian region of the brachial valve, functioning in articulation, support of the lophophore, and muscle attachment.

cardinal margin (BRACHIO) The curved posterior margin of the shell.

cardinal plate (BRACHIO) A plate extending across the posterior end of the brachial valve, consisting of outer hinge plates and inner hinge plates or plate.

cardinal platform (MOLL: Bivalvia) An internal plate containing teeth below the beak and adjoining parts of the dorsal margin; hinge plate.

cardinal process (BRACHIO) A blade or boss of the secondary shell placed medially in the posterior end of the brachial valve for the separation or attachment of the diductor muscles.

cardinal tooth (MOLL: Bivalvia) The hinge tooth positioned near the beak.

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