Can you tell me the characteristics of cephalopods? Unlike its extant sister group Nautiloidea, whose members have a rigid outer shell for protection, the coleoids have at most an internal cuttlebone, gladius, or shell that is used for buoyancy or support. They display vivid coloration, typically seen in … All cephalopods are predators. These are ancient species that are discovered in all of the globe’s oceans, and are believed to have actually originated about 500 thousand years earlier. Facts about cephalopods tell you about the marine animals included in the molluscan class of Cephalopoda. Class Cephalopoda (“head foot” animals) includes octopi, squids, cuttlefish, and nautilus. "head foot" Who is Jacques Cousteau? Squid, cuttlefish, octopus, nautilus. Examples of class Cephalopoda. The man who created the scuba and the first to say that the octopus was intelligent. The cephalopods are a diverse class of mollusks (a group that also includes snails and bivalves) that emerged during an explosion of animal diversity in the oceans during the Cambrian period, over 500 million years ago (mya). Class Cephalopoda. In English, it means head feet. Cuttlefish, like most cephalopods, have a large and well-developed head. The word cephalopod means "head-footed" and describes the body structure of the invertebrates. Class Cephalopoda  General characteristics: They are the most complex invertebrates and mulluscs , The foot of a cephalopoda has evolved into tentacles or arms used for capturing prey, movement , and attachment. Subclass Coleoidea, or Dibranchiata, is the grouping of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less," i.e., octopus, squid and cuttlefish. Cephalopods are a special group that is made up of the squids, octopi, cuttlefish, nautilus, and the deep-water spirula. Cephalopods are a class of shell-bearing animals as well as mollusks with a reduced shell. Characteristics of Clas Cephalopoda. The name of this class is taken from the Greek word. Squid are in the Mollusca phylum and the class Cephalopoda. They have a prominent head. The name "Cephalopoda" literally means "head-foot", as the foot is directly attached to the head. The most noticeable characteristic is the tentacles. The foot in Cephalopods is incorporated into the mantle cavity and the head is in line with the visceral mass. This is one of several characteristics that most members of this class share. Their foot is divided into may tentacles with strong suction cups or hooks for capturing prey. Cephalopod - Cephalopod - Classification: In fossil cephalopods, reliance is placed upon shell details (general shape, type of coiling, external sculpture, and sutures). 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