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Gastropoda 腹足纲 腹足纲 Gastropoda n 1: snails and slugs and their relatives [ synonym: { Gastropoda}, { class Gastropoda}, { Gasteropoda}, { class Gasteropoda}] Gastropoda \ Gas* trop" o* da\, n. pl., [ NL., fr. Gr. ?, ?, stomach - poda.] ( Zool.) One of the classes of Mollusca, of great extent. It includes most of the marine spiral shells, and the land and fresh- water snails. They generally creep by means of a flat, muscular disk, or foot, on the ventral side of the body. The head usually bears one or two pairs of tentacles. See { Mollusca}. [ Written also { Gasteropoda}.] [ 1913 Webster] Note: The Gastropoda are divided into three subclasses; viz.: ({ a}) The Streptoneura or Dioecia, including the Pectinibranchiata, Rhipidoglossa, Docoglossa, and Heteropoda. ({ b}) The Euthyneura, including the Pulmonata and Opisthobranchia. ({ c}) The Amphineura, including the Polyplacophora and Aplacophora. [ 1913 Webster]
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