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

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 Ja...

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Bibliographic Details
Main Author: Medina, Francisco Alberto
Language:unknown
Published: 2009
Subjects:
Aptian
Hexanchiformes
James Ross Island
Neoselachii
Carboniferous
Cenomanian
fossil record
shark
Southern Hemisphere
subantarctic region
tooth
Antarctic Peninsula
Antarctica
West Antarctica
Chondrichthyes
Hexanchus
Antarctic
Argentina
Kotick
Kotick Point
Ross Island
Antarc*
Online Access:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09541020_v21_n5_p501_Cione
https://hdl.handle.net/20.500.12110/paper_09541020_v21_n5_p501_Cione
Description
Summary: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). © Antarctic Science Ltd 2009. Fil:Medina, F. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.

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