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

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 p...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Cione, Alberto Luis, Medina, Francisco
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2009
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarctic
Antarctic Peninsula
Ross Island
Kotick
Kotick Point
Antarc*
Antarctic Science
Antarctica
James Ross Island
Online Access:http://dx.doi.org/10.1017/s0954102009990228
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102009990228
Description
Summary: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).

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