These animals have a mantle that secretes conchiolin [kon-KIE-uh-lin] and calcium carbonate.
This phylum includes the proposed serialia clade [seh-ree-A-lee-uh klade], which in turn includes monoplacophora, which were once thought to be extinct. Though it does not exist in protobranchia and heterodonta, most of the animals in this phylum use a radula to take in food. These animals have a mantle that secretes conchiolin [kon-KIE-uh-lin] and calcium carbonate. Name this phylum that includes cephalopods [SEH-fuh-loe-pods] such as octopus and squid and also includes bivalves and snails, a phylum whose animals are often covered by shells.
This phylum includes the proposed serialia clade [seh-ree-A-lee-uh klade], which in turn includes monoplacophora, which were once thought to be extinct.
Mollusca (or Mollusks)