the Davidson Seamount at 3233 meters. Interstitial water extracted from sediments at most of these stations was found to be toxic to Pacific purple sea urchin purpuratus). purple sea urchin. Zeev Pancer*. Division of Biology 156-29, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125. Purple Sea Urchin purpuratus). Description:: The body and spines of this echinoderm are typically bright purple; juveniles are green;. The purple definitions Web urchin sea about is inches 4 with across, spines up 1.5 to inches. It bright is purple. hard, The outer body

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