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The mobile urchin is reddish tan with an ...
Purchased from a fish store to use as a presentation in a grade school zoology ...
Red and white sea urchin with thick red ...
visible and how on the other the spines are. Reminds me of a modern
is a cidaroid sea urchin that inhabits ...
This sea urchin would have been about 50 mm ...
Panamanian part of the North Pacific Ocean. In Panama this species is common ...
Not the best photos but I don't think I've ever spotted this creature before ...