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Pirania - Artist's View - Middle Cambrian Pirania - Pirania is a genus of primitive sponge that inhabited the ocean floor about 505 million years ago in the Cambrian. A species of Pirania, a primitive sponge that populated the ocean floors about 505 million years ago. The stems were hollow with bunches of long spicules attached to them. Based upon a sketch reconstruction by J.K. Rigby from the book, The Burgess Shale by Harry B. Whittington. Published in 1985 by Yale University Press
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