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A new species of chimaeriform (Chondrichthyes, Holocephali) from the uppermost Cretaceous of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica

Published online by Cambridge University Press:  08 October 2012

Rodrigo A. Otero ,
David Rubilar-Rogers ,
Roberto E. Yury-Yañez ,
Alexander O. Vargas ,
Carolina S. Gutstein ,
Francisco Amaro Mourgues  and
Emmanuel Robert
Rodrigo A. Otero*
Affiliation:
Área Paleontología, Museo Nacional de Historia Natural, Casilla 787, Santiago, Chile
David Rubilar-Rogers
Affiliation:
Área Paleontología, Museo Nacional de Historia Natural, Casilla 787, Santiago, Chile
Roberto E. Yury-Yañez
Affiliation:
Laboratorio de Zoología de Vertebrados, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile
Alexander O. Vargas
Affiliation:
Laboratorio de Ontogenia y Filogenia, Departamento de Biología, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile
Carolina S. Gutstein
Affiliation:
Laboratorio de Ecofisiología, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Las Palmeras 3425, Ñuñoa, Santiago, Chile
Francisco Amaro Mourgues
Affiliation:
Sección Paleontología y Estratigrafía, Servicio Nacional de Geología y Minería. Tiltil 1993, Ñuñoa, Santiago, Chile
Emmanuel Robert
Affiliation:
Laboratoire UMR CNRS 5125 “PaléoEnvironnements & PaléobioSphère”, Université Claude Bernard Lyon 1, Campus de la Doua, Bâtiment “GEODE”, 2 rue Raphaël Dubois, 69622 Villeurbanne, France
*
paracrioceras@gmail.com
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Abstract

We describe a new chimaeriform fish, Callorhinchus torresi sp. nov., from the uppermost Cretaceous (late Maastrichtian) of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica. The material shows it is distinct from currently known fossil and extant species of the genus, whereas the outline of the tritors (abrasive surfaces of each dental plate) shows an intermediate morphology between earlier records from the Cenomanian of New Zealand and those from the Eocene of Isla Marambio. This suggests an evolutionary trend in tritor morphology in the lineage leading to modern callorhynchids, during the Late Cretaceous-Palaeogene interval.

Keywords

Antarctic PeninsulaCallorhinchus torresi sp. nov.cartilaginous fish
Type
Earth Sciences
Information
Antarctic Science , Volume 25 , Issue 1 , February 2013 , pp. 99 - 106
Copyright
Copyright © Antarctic Science Ltd 2012

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