Classes  within this phylum include Cephalopoda and Gastropoda.
This phylum includes organisms called limpets and nudibranches. In this phylum, organs are  located in an area called the visceral mass. Ammonites are an extinct group of animals belonging  to this phylum. Members of this phylum have a tongue-like appendage made of chitin called the  radula. Their bodies are covered by a mantle, although it is often hidden under a shell. Classes  within this phylum include Cephalopoda and Gastropoda. For 10 points, name this phylum,  which includes animals such as squids, clams, and snails.
This phylum includes organisms called limpets and nudibranches.
Mollusca [accept mollusks]