Redtail or Collared butterflyfish (Chaetodon collare) with Blue coral (Heliopora coerulea).

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The coral genus Heliopora is as hard as a stony coral, but a member of the subclass Octocorallia, which otherwise comprises more or less corals with soft tissues only. Only the interior of the skeleton reveals the blue colour. This coral is a living fossil with a evolutionary age of more than 100 million years. Andaman Sea, Thailand.

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Size: 4287px × 2848px
Location: Andaman Sea Thailand
Photo credit: © Georgette Apol / Alamy / Afripics
License: Licensed
Model Released: No

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