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1 December 2013 The First Report of South American Edrioasteroids and the Paleoecology and Ontogeny of Rhenopyrgid Echinoderms
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Abstract

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 analysis shows that rhenopyrgids are more closely related to edrioasterid edrioasteroids such as edrioblastoids and cyathocystids than to pyrgocystid isorophids.

© 2013 C.D. Sumrall et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Colin D. Sumrall, Susana Heredia, Cecilia M. Rodríguez, and Ana I. Mestre "The First Report of South American Edrioasteroids and the Paleoecology and Ontogeny of Rhenopyrgid Echinoderms," Acta Palaeontologica Polonica 58(4), (1 December 2013). https://doi.org/10.4202/app.2011.0108
Received: 20 July 2011; Accepted: 30 January 2012; Published: 1 December 2013
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