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Project Noah Nature School
constitute the class Echinoidea of the echinoderm phylum
They inhabit all oceans. Their shell, or "test", is round and spiny, typically from 3 to 10 centimetres (1.2 to 3.9 in) across. Common colors include black and dull shades of green, olive, brown, purple, and red. They move slowly, feeding mostly on algae.
Sea
Found this urchin under a rock.
Spotted on Apr 19, 2011
Submitted on Aug 22, 2011
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