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Strongylocentrotus droebachiensis
We found this on the shore where the waves crash against rocks.
Laura are they found on the east coast... Gulf of Maine area? I'll go check them out on wikipedia
A very lovely photo! I like the green theme with the urchin test and the lichen on the rocks. I'd be willing to bet this is Strongylocentrotus droebachiensis, the green sea urchin :)