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mollusca n. 軟體動物類 軟體動物類 Mollusca n 1: gastropods; bivalves; cephalopods; chitons [ synonym: { Mollusca}, { phylum Mollusca}] Mollusca \ Mol* lus" ca\, prop. n. pl. [ NL. See { Mollusk}.] ( Zool.) One of the grand divisions of the animal kingdom, a phylum including the classes Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, and Pelecyopoda ( syn. Bivalvia, formerly called Lamellibranchiata, or Conchifera). These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally. Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity. They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve. [ 1913 Webster PJC] Note: Formerly the Brachiopoda, Bryzoa, and Tunicata were united with the Lamellibranchiata in an artificial group called Acephala, which was also included under Mollusca. See { Molluscoidea}. [ 1913 Webster]
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