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A pelagic, or open-ocean octopus gives off a neon glow in Hawaii. Most species of octopus have no internal skeleton, unlike other cephalopods. by Chris Newbert, Minden Pictures

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Pelagic Octopus. Octopuses have 2 eyes and 4 pairs of arms and are bilaterally symmetric. An octopus has a hard beak, with its mouth at the center point of the arms. Octopus lack an internal or external skeleton allowing them to squeeze through tight places. Octopuses are among the most intelligent and behaviorally flexible of all invertebrates.

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Wonders of the sea: Fascinating pictures from mesmerising collection of photos from the ocean's depths

Dangers of the deep: The giant pelagic jellyfish grows to twice the size of a fully grown man with a nasty sting in its tentacles

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The Argonauts are a group of pelagic octopuses. They are also called paper nautiluses, referring to the paper-thin eggcase that females secrete. This structure lacks the gas-filled chambers present in chambered nautilus shells and is not a true cephalopod shell, but rather an evolutionary innovation unique to the genus Argonauta. It is used as a brood chamber and for trapped surface air to maintain buoyancy.

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"A rare photo of a moray eel's pelagic larvae, called a leptocephalus, or small head. The head is not visible in this photo."

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White-cheeked Surgeonfish(Acanthurus nigricans) also known as Gold-rimmed Surgeonfish or Whitecheek Tang

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Photos of the Luminous Bobtail Squid

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Argonauta nodosa, one of the argonauts, or "paper nautilii", a female octopus with a shell-like eggcase

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