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Cuttlefish itself is a marine animal from the order Sepiida. They belong to the class Cephalopoda, which also includes squid, octopodes, and nautiluses. Cuttlefish have a unique internal shell, or cuttlebone, and therefore cuttlefish are also often referred to as cuttlefish. However, even though the name is fish, cuttlefish is not a fish but a mollusk.