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Book Chapter

First gondwanatherian mammal from Antarctica

By
Francisco J. Goin
Francisco J. Goin
1
División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina (e-mail: fgoin@museo.fcnym.unlp.edu.ar)
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Marcelo A. Reguero
Marcelo A. Reguero
1
División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina (e-mail: fgoin@museo.fcnym.unlp.edu.ar)
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Rosendo Pascual
Rosendo Pascual
1
División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina (e-mail: fgoin@museo.fcnym.unlp.edu.ar)
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Wighart Von Koenigswald
Wighart Von Koenigswald
2
Institut für Paläontologie, Universität Bonn, Nussallee 8, D-53115 Bonn, Germany
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Michael O. Woodburne
Michael O. Woodburne
3
Department of Earth Sciences, University of California, Riverside, CA 92521, USA
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Judd A. Case
Judd A. Case
4
Department of Biology, St Mary’s College, Moraga, CA 94575, USA
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Sergio A. Marenssi
Sergio A. Marenssi
5
Instituto Antártico Argentino, Cerrito 1248, 1010 Buenos Aires, Argentina
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Carolina Vieytes
Carolina Vieytes
1
División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina (e-mail: fgoin@museo.fcnym.unlp.edu.ar)
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Sergio F. Vizcaíno
Sergio F. Vizcaíno
1
División Paleontología Vertebrados, Museo de La Plata, Paseo del Bosque s/n, 1900 La Plata, Argentina (e-mail: fgoin@museo.fcnym.unlp.edu.ar)
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Published:
January 01, 2006

Abstract

Gondwanatherians are an enigmatic group of extinct non-therian mammals apparently restricted to some of the western Gondwanan continents (Late Cretaceousearly Palaeocene of South America, and Late Cretaceous of Madagascar and India). They developed rodent-like incisors and the earliest known hypsodont cheek-teeth among mammals. Recently, a small rodent-like dentary fragment was recovered from middle Eocene beds on the Antarctic Peninsula, preserving part of the incisor; both the incisor enamel structure and the mandibular morphology suggest close affinities with Sudamerica ameghinoi from the early Palaeocene of Patagonia, up to now the youngest known Gondwanatheria. Thus, the new specimen becomes the youngest occurrence of a gondwanathere, adding significant direct and indirect evidence on: (1) the already documented cosmopolitanism of gondwanatheres among Gondwanan mammals; and (2) the crucial biogeographical role of Antarctica during the Cretaceous–Tertiary mammalian transition.

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Contents

Geological Society, London, Special Publications

Cretaceous–Tertiary High-Latitude Palaeoenvironments: James Ross Basin, Antarctica

J. E. Francis
J. E. Francis
University of Leeds, UK
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D. Pirrie
D. Pirrie
University of Exeter in Cornwall, UK
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J. A. Crame
J. A. Crame
British Antarctic Survey, UK
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Geological Society of London
Volume
258
ISBN electronic:
9781862395060
Publication date:
January 01, 2006

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