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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Language: | unknown |
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2009
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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 |
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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