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Sea urchin
constitute the class Echinoidea of the echinoderm phylum
19.1817, -88.4791
Field Notes
Description:
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.
Habitat:
Sea
Notes:
Found this urchin under a rock.
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