Thesaurus: mollusca

Related headwords

Definitions

1. n. pl. One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and 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.
2. One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, PteropodaScaphopoda, and 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. 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 Molluscoudea.
3. One of the grand divisions of the animal kingdom, including theclasses Cephalopoda, Gastropoda, PteropodaScaphopoda, andLamellibranchiata, or Conchifera. These animals have an unsegmentedbilateral body, with most of the organs and parts paired, but notrepeated longitudinally. Most of them develop a mantle, whichincloses either a branchial or a pulmonary cavity. They are generallymore or less covered and protected by a calcareous shell, which maybe univalve, bivalve, or multivalve.
4. n gastropods; bivalves; cephalopods; chitons