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mollusc

World Encyclopedia | 2005 | © World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

mollusc Any of more than 80,000 species of invertebrate animals in the phylum Mollusca. They include the snails, clams and squids, and a host of less well-known forms. Originally marine, members of the group are now found in the oceans, in freshwater and on land. There are six classes: the gastropods, chitons, univalves (slugs and snails), bivalves, tusk shells, and cephalopod. The mollusc body divides into three: the head, the foot, and the visceral mass. Associated with the body is a fold of skin (the mantle) that secretes the limy shell typical of most molluscs. The head is well developed only in snails and in the cephalopods. The visceral mass contains the internal organs. The sexes are usually separate but there are many hermaphroditic species.

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