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Dwarf cuttlefish (Sepia bandensis)

fuckyeahaquaria:

Dwarf Cuttlefish

Sepia bandensis

The cuttlefish gets its name from its cuttlebone—an internal, porous structure that helps the animal regulate its buoyancy. The cuttlefish can control that buoyancy by changing the gas-to-liquid ratio via a specialized tube called the ventral siphuncle. Cuttlefishes are unique in that no other cephalopods have cuttlebones.