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The oldest hexanchiform shark from the Southern Hemisphere (Neoselachii; Early Cretaceous, Antarctica)

Published online by Cambridge University Press:  01 October 2009

Alberto Luis Cione  and
Francisco Medina
Alberto Luis Cione*
Affiliation:
División Paleontología de Vertebrados, Museo de La Plata, 1900 La Plata, Argentina
Francisco Medina
Affiliation:
Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
*
*[email protected]
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Abstract

The oldest record of the hexanchiform sharks from the Southern Hemisphere and the second chondrichthyan report known from Carboniferous to Early Cretaceous beds in Antarctica is given. The material was collected in late Aptian rocks of the Kotick Point Formation outcropping in the western part of James Ross Island, near Antarctic Peninsula. It consists of an isolated tooth assignable to a hexanchiform different from the other described genera. The tooth shows putative plesiomorphic cusp (few cusps, no serrations) and apomorphic root characters (relatively deep, quadrangular). It could be related to a species close to the origin of Hexanchus (unknown in beds older than Cenomanian).

Keywords

AptianHexanchiformesJames Ross IslandNeoselachii
Type
Earth Sciences
Information
Antarctic Science , Volume 21 , Issue 5 , October 2009 , pp. 501 - 504
Copyright
Copyright © Antarctic Science Ltd 2009

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