Aristotle’s Lantern

close-up of sea urchin teeth

I’ve found sea urchin shells on the beach before, but never with teeth, probably because they’re pretty delicate.  

sea urchin with teeth

I knew that they grazed on algae, but I didn’t know that their teeth were so, well, teeth-like.

I also didn’t know what this National Geographic site informed me: “a recent study found that the sound of their teeth scraping on reefs can cause a rise in ocean noise.”

sea urchin teeth from underneath
And this is what the teeth assembly looks like from underneath.

Oh, and why the title? You can read about it here.

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