Haliotis scalaris (Australia). Living on rocks in surge zones, their rippled surface creates eddies in water flow dynamics that help them to stay in place (clever, right?) We supplied some to the Max Planck Institute for Biomaterial research.
Where the ocean meets the sky, where the giant octopus lives and where pirates have buried their treasures. There might live the mermaid, that so many old sailors still talk about when the light of day passes and the liquor flows in the taverns.