The First Report of South American Edrioasteroids and the Paleoecology and Ontogeny of Rhenopyrgid Echinoderms

@inproceedings{Sumrall2012TheFR,
  title={The First Report of South American Edrioasteroids and the Paleoecology and Ontogeny of Rhenopyrgid Echinoderms},
  author={Colin D. Sumrall and Susana Heredia and C. G. V. Rodriguez and Ana Mestre},
  year={2012}
}
A new species of rhenopyrgid edrioasteroid Rhenopyrgus piojoensis sp. nov. is described form the Silurian (Lower Ludlow) Los Espejos Formation in the Precordillera of Argentina. This species is the first reported edrioasteroid from South America. Rhenopyrgids are widely distributed in Ordovician through Devonian deposits of most continents. Numerous juvenile specimens show that the general bodyplan is organized early in ontogeny and that the pedenculate zone lengthens with age. Phylogenetic… 
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