Antarctic Science

Table of Contents - 2009 - Volume 21, Issue 05  

Cambridge Journals Online - CUP Full-Text Page
Antarctic Science (2009), 21:501-504 Cambridge University Press
Copyright © Antarctic Science Ltd 2009
doi:10.1017/S0954102009990228

Earth Sciences

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

Alberto Luis Cionea1 c1 and Francisco Medinaa2

a1 División Paleontología de Vertebrados, Museo de La Plata, 1900 La Plata, Argentina
a2 Departamento de Ciencias Geológicas, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Article author query
cione al [PubMed]  [Google Scholar]
medina f [PubMed]  [Google Scholar]

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).

(Received December 06 2008)

(Accepted March 23 2009)

Key wordsAptian; Hexanchiformes; James Ross Island; Neoselachii

Correspondence:

c1 acione@museo.fcnym.unlp.edu.ar

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