What are cuttlefish ? Despite their name, cuttlefish are not fish but intelligent invertebrates related to the octopus, squid, and nautilus. Cuttlefish are marine animals closely related to squid, octopus, and nautilus. They are in the taxonomic class Cephalopoda, but differ from their other cephalopod cousins slightly. Because of this, scientists place them in their own order, Sepiida. These creatures resemble fat squids with short arms and tentacles, and they vary greatly in size. Read on to learn about the cuttlefish . Cuttlefish are squid -like marine mollusks comprising the cephalopod order Sepiida, characterized by an internal shell (cuttlebone) on their back, large W-shaped pupils, and a total of ten tentacles and arms (eight arms and two tentacles furnished with denticulated suckers). Despite their common name, cuttlefish are not fish but members of the invertebrate phylum Mollusca. They belong to the same cephalopod subclass Coleoidea with octopuses and squids. In some classifications, cuttlefish are ... The cuttlebone of a cuttlefish . This is the largest hard part of a cuttlefish , maintaining the rigidity of its body. The common cuttlefish is one of the largest species of cuttlefish with a mantle length reaching up to 45 cm and a mass of 4 kg on a presumed male, although this is for an exceptional specimen in temperate waters; specimens in subtropical waters rarely surpass a mantle length of 30 cm and 2 kg in mass. The mantle houses the reproductive and digestive tracts of the cuttlefish ...
