The Vampire Squid (Vampyroteuthis infernalis, below) is the unofficial mascot of the deep-sea. It has several types of light organs on its body, and recently, Jay Hunt and Bruce Robison found that it has light organs at the tips of its arms. Here you can see the auto-fluorescence caused by these special luminous organs with the dark shadows showing the suckers running along the middle of the arm. An in-situ picture of the live animal is below the fluorescence picture.

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