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Pseudodiadematidae are members of the phylum Echinodermata. Their fossil remains date to the Cretaceous period (144 - 66.4 MYA).
Lytechinus variegatus, Lamarck, 1816 (also called green sea urchin or variegated sea urchin) is a species of sea urchin that can be found in the warm waters of the western Atlantic Ocean. It has short spines and can reach a diameter of around 11 cm.
