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Unformatted text preview: observed in some lophotrochozoan animals, including some annelids and molluscs. tube foot One of numerous extensions of an echinoderms water vascular system. Tube feet function in locomotion, feeding, and gas exchange. visceral mass One of the three main parts of a mollusc; the part containing most of the internal organs. See also foot, mantle....
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- Spring '10