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Pygaster. en Pygaster an echinoderm from the Cretaceous of Neuquen Argentina es Pygaster un equinodermo Cerro El Marucho Neuqun Formacin Agrio cretcico inferior millones de aos own Dhzanette Pygaster Echinoidea fossils Nature of Neuqun Province Fossils of Patagonia Animals of Argentina
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