All Coleoid Cephalopod Genera (Squid, Cuttlefish and Octopus)

Coleoid Cephalopod Genera (Squid, Cuttlefish and Octopus) is a Browse By group of the Nature Atlas that gathers genera of coleoid cephalopods, the soft-bodied mollusks that carry their shell inside the body or have lost it, which include the squid, cuttlefish, octopuses and their relatives, such as Spirula, the ram's horn squid, a deep-water species with a coiled internal shell and a light-emitting organ at its tail end. An entry belongs here when its own cited article describes a genus of squid, cuttlefish, octopus or a related coleoid. It excludes the nautiluses, which keep an external shell and have a group of their own, and it excludes the snails and slugs. The group lets a reader compare the intelligent, fast-swimming mollusks with their shelled cousins.