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Lab10.Echinodermata

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eperto più antico:<br />

ribrachidium<br />

auna di Ediacara.<br />

roterozoico Sup.<br />

tra 620 e 550 MdA)<br />

robabile echinozoa<br />

imile agli Edrioasteroidi:<br />

forma di sacco o<br />

Phylum ECHINODERMATA<br />

paleontologia

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