A purple sea urchin, Credit: Claire Fackler, NOAA National Marine SanctuariesFrom Live Science:
Sea urchins may use the whole surface of their bodies as compound eyes, scientists now suggest.
Although sea urchins don't have any problems avoiding predators or finding comfortable dark corners to hide in, they don't have eyes. The question then is how they see.
Genetic analysis of sea urchins has revealed they have light-sensitive molecules, mostly in their tube feet and in tiny stalked appendages found in among their spines. As such, "it looks like the entire surface of their bodies are acting as one big eye," said researcher Sönke Johnsen, a marine biologist at Duke University.
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