A group of freshwater and saltwater animals with no skeleton and usually one or two hard shells made of calcium carbonate Includes the oyster, clam, mussel, snail, conch, scallop, squid, and octopus
Soft-bodied marine and freshwater animals that often secrete some kind of protective shell Members of this group include: clams, snails, octopus and squid
or mollusc Any of some 75,000 species of soft-bodied invertebrate animals (phylum Mollusca), many of which are wholly or partly enclosed in a calcium carbonate shell secreted by the mantle, a soft covering formed from the body wall. Between the mantle and the body is the mantle cavity. Mollusks occur in most habitats from the deep sea to high mountains. Living mollusks are usually grouped into eight classes: Gastropoda (see gastropod), Bivalvia or Pelecypoda (see bivalve), Cephalopoda (see cephalopod), Scaphopoda (tusk shells), Aplacophora (Solenogasters), Caudofoveata (sometimes included in the Aplacophora order), Polyplacophora (chitons), and Monoplacophora. Mollusks are economically important as food, and their shells are widely used in jewelry and decorative items
an invertebrate (a class of organisms have no spine or backbone) having a soft unsegmented body usually enclosed in a shell (clams, snails, and octopuses are examples)
– Member of the phylum Mollusca Invertebrate animals with soft unsegmented bodies, a muscular foot, and a body enclosed in a mantle Most mollusks have a calcareous outer shell