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Description of Argenthina emilyae, a new genus and species of ocenebrine muricid gastropods from the early Middle Miocene of Argentina

Published online by Cambridge University Press:  20 May 2016

Gregory S. Herbert  and
Claudia Julia del Río
Gregory S. Herbert
Affiliation:
Department of Geology and Center for Population Biology, University of California, Davis 95616 New address: Department of Geology, University of South Florida, Tampa 33620,
Claudia Julia del Río
Affiliation:
Museo Argentino de Ciencias Naturales, Angel Gallardo 470, 1405 Buenos Aires,
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Abstract

Argenthina emilyae is a new genus and species of extinct muricid gastropods from the early Middle Miocene of southern Argentina. Most of its shell features are consistent with those of the Acanthina-clade of Thais-like ocenebrines, including a broad, rounded body whorl, a large aperture lacking ornamentation, and a short, open siphonal canal, although other characters are consistent with the Ocinebrina-like ocenebrines, such as the differentiation of axials into varices and intervaricals and complex spiral sculpture. This combination of traits is unique in the Ocenebrinae. It is not yet clear whether this new taxon represents an episode of morphological experimentation by a stem group of Thais-like ocenebrines resulting in convergence on the Ocinebrina-like shell form or an evolutionarily intermediate step between Thais-like and Ocinebrina-like ocenebrines. Intermediates are expected from previously published phylogenetic hypotheses for the Ocenebrinae that suggest Ocinebrina-like ocenebrines have evolved multiple times from Thais-like ocenebrines. Until now, however, such intermediates have not been reported from the fossil record.

Type
Research Article
Information
Journal of Paleontology , Volume 79 , Issue 5 , September 2005 , pp. 939 - 943
Copyright
Copyright © The Paleontological Society 

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