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Cuttlefishes, squids, octopuses and nautili are the most important representatives of class Cephalopoda. The class includes about 1000 known species, which represent about 2.07% of phylum Mollusca (Hassan, 1974). As a group they includes the largest species of both modern and fossil invertebrates in both the coastal and the oceanic waters, inhabiting different kinds of grounds. Commercially, they represent a remarkable and significant fishery in many areas of the world. From the total catch of world cephalopod fishery, about 71.8% were squids, 13.6% cuttlefishes and 14.6% octopuses (Jereb & Roper 2005).

Monograph of the Egyptian Cuttlefishes Order: Sepioidea; Cephalopoda: Mollusca (Part I)