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  • octopus external anatomy
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    Gallery images and information: Octopus External Anatomy

    As for the external anatomy, the octopus has eight long tentacles which on the underside of them possess two rows of ring-shaped suction cups which help the animal to grasp onto surfaces and allows it a sense of touch [WWW3]. The beak, buccal mass and the tip of the siphon are also external. The largest organ visible externally is the skin.

    Most of us are fascinated by the overall anatomy of the Octopus. Well known for a very large head and eight arms, it is able to move around the water with speed and grace. As it moves the eight arms move along behind it. When one of the arms is lost due to injury it can grow a replacement in very little time.

    ­The octopus belongs to the phylum mollusca , where you will also find its slimy next of kin, the clams, snails and slugs. But octopuses are separated from the mollusks into the class cephalopoda , which includes the most advanced animals of the phylum. Squid, cuttlefish and nautilus belong to this class as well. The octopus has evolved most since the cephalopods originated more than 600 million years ago. While the other cephalopods sport some form of inner or outer shell like their relatives the mollusks, the octopus has none.