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A novel late Early Miocene assemblage of terrestrial gastropods from Santa Cruz (Patagonia, Argentina)

Published online by Cambridge University Press:  22 March 2016

Sergio E. Miquel  and
Pablo E. Rodriguez
Sergio E. Miquel
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Museo Argentino de Ciencias Naturales Bernardino Rivadavia, Av. Ángel Gallardo 470, Ciudad Autónoma de Buenos Aires C1405DJR, República Argentina 〈semsnail@yahoo.com.ar〉, 〈semsnail@macn.gov.ar〉
Pablo E. Rodriguez
Affiliation:
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Cátedra y Museo de Paleontología, Sección Paleovertebrados, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 299, Córdoba X5000JJC, República Argentina; Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 1611, Córdoba X5016GCA, República Argentina 〈pabloem.rodriguez@gmail.com〉
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Abstract

A remarkable fossil assemblage composed of five gastropod taxa is described from the Early Miocene of Santa Cruz (Patagonia, Argentina) in southernmost South America. The assemblage includes extinct and living genera South America, and on geographic distributions and represent background new information on spatial and across time distributions as well as identification of new taxa. A new taxon, Patagocharopa enigmatica n. gen. n. sp., is tentatively assigned to Charopidae. Gastrocopta patagonica n. sp. (Vertiginidae) represents the oldest record of Gastrocopta in Argentina and the southernmost record for the Americas. Punctum patagonicum n. sp. (Punctidae) represents the first record of Punctum for continental South America, and characterized by a protoconch with traces of axial costulae and a teleoconch with strong radial ribs. Zilchogyra miocenica n. sp. is the first Miocene record of the charopid genus Zilchogyra. Fragments of a possible Scolodonta (Scolodontidae) are recorded. Overall, the assemblage represents an important and useful paleoenvironmental tool. This fauna suggests that a more temperate and humid environment than today—with a more dense vegetation cover—was prevalent at this site during the Early Miocene.

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Journal of Paleontology , Volume 89 , Issue 5 , September 2015 , pp. 748 - 761
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Copyright © 2016, The Paleontological Society 

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