Spiny eyes. With legs and mouths.

LiveScience illuminates a mystery I’m not sure I even knew existed – how is it that sea urchins can see without eyes:

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.

Entered on 9 February 2010 at 6:06 in the Science file | 1 Observation | Print Print

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  1. [...] SOURCE: “Body of Sea Urchin is One Big Eye”, LiveScience , 28 Dec 2009, as used in the post “Spiny eyes. With legs and mouths.” [...]

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