They are generally more or less covered and protected by a calcareous shell, which may be univalve, bivalve, or multivalve
A organism in the invertebrate Phylum Mollusca, a major group of marine, aquatic and terrestrial animals which are soft bodied and usually have a hard shell, examples are clams, mussels, snails, octopus and squid
an animal phylum that includes bivalves, squids, octopuses and snails They are distinguished by a muscular foot, a calcareous shell secreted by the underlying body wall (the mantle) and a feeding organ (the radula) Many species are common inhabitants of coral reefs
Most of them develop a mantle, which incloses either a branchial or a pulmonary cavity
One of the grand divisions of the animal kingdom, including the classes Cephalopoda, Gastropoda, Pteropoda, Scaphopoda, and Lamellibranchiata, or Conchifera
These animals have an unsegmented bilateral body, with most of the organs and parts paired, but not repeated longitudinally