Cephalopods are similar to mollusks, these animals have a reduced internal shell called a pen or cuttlebone. For example: squid, octopus, and cuttlefish.
---Molluscs are a clade of organisms that all have soft bodies which typically have a "head" and a "foot" region. Often their bodies are covered by a hard exoskeleton, as in the shells of snails and clams or the plates of chitons.
