An undescribed late Cretaceous Notorynchus tooth (Chondrichthyes, Vertebrata) from the English Chalk

The hexanchid shark genus Notorynchus appeared in the early Cretaceous as the single species Notorynchus aptiensis (Pictet, 1865). The genus has hitherto been unknown in the late Cretaceous, reappearing in the early Eocene as N. serratissimus (Agassiz, 1843), a hiatus throughout the late Cretaceous...

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Bibliographic Details
Published in:Proceedings of the Geologists' Association 2001, Vol.112 (1), p.59-62
Main Author: Smart, P.J.
Format: Article
Language:English
Subjects:
Chondrichthyes
Hexanchus
Marine
Microdon
Notorynchus
Vertebrata
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Summary:The hexanchid shark genus Notorynchus appeared in the early Cretaceous as the single species Notorynchus aptiensis (Pictet, 1865). The genus has hitherto been unknown in the late Cretaceous, reappearing in the early Eocene as N. serratissimus (Agassiz, 1843), a hiatus throughout the late Cretaceous that has never been satisfactorily explained. This paper describes a single tooth in the collections of the Natural History Museum, London, at present ascribed to the late Cretaceous species Hexanchus microdon (Agassiz, 1843), but which exhibits the morphological characteristics of a Notorynchus sp. lower jaw anterolateral tooth.
ISSN:0016-7878
DOI:10.1016/S0016-7878(01)80049-3