Sepia cuttlefish

There are more than 100 species of sepia cuttlefish, a greater number of species than in any other genus. Like all cuttlefish they contain cuttlebones, which are not bones but lightweight structures that help regulate buoyancy. This internal shell is filled with tiny compartments into which the cuttlefish can pump air or fluid to make itself lighter or heavier. The name sepia comes from the brown pigment released when the cuttlefish is alarmed. Sepia cuttlefish are distinguised by the length of the cuttlebone, which is roughly equal to that of the mantle in which it is housed, not an easy feature to spot. This group contains the world's largest cuttlefish, .

Source: http://www.bbc.co.uk/nature/life/Sepia_%28genus%29

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