Class Cephalopoda refers to a group of marine animals that includes octopuses, squids, and cuttlefish. This class is characterized by the presence of a distinct head, a mantle, and multiple arms or tentacles. Some synonyms for Class Cephalopoda include the "head-footed" animals and the "cephalopods." Additionally, scientists may refer to these animals as the "molluscan" or "cephalopod mollusks" as they are part of the phylum Mollusca. The term "inkfish" is also used to describe some members of this class since they have the ability to release a dark cloud of ink as a form of defense. Other synonyms include "coleoids" and "dibranchiates".