A new species of chimaeriform (Chondrichthyes, Holocephali) from the uppermost Cretaceous of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica

We describe a new chimaeriform fish, Callorhinchus torresi sp. nov., from the uppermost Cretaceous (late Maastrichtian) of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica. The material shows it is distinct from currently known fossil and extant species of the genus, wher...

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Bibliographic Details
Published in:Antarctic Science
Main Authors: Otero, Rodrigo A., Rubilar-Rogers, David, Yury Yáñez, Roberto E., Vargas, Alexander O., Gutstein, Carolina S., Mourgues, Francisco Amaro, Robert, Emmanuel
Format: Article in Journal/Newspaper
Language:unknown
Published: Zenodo 2013
Subjects:
Antarc*
Antarctica
Seymour Island
Online Access:https://doi.org/10.1017/s095410201200079x
Description
Summary:We describe a new chimaeriform fish, Callorhinchus torresi sp. nov., from the uppermost Cretaceous (late Maastrichtian) of the López de Bertodano Formation, Isla Marambio (Seymour Island), Antarctica. The material shows it is distinct from currently known fossil and extant species of the genus, whereas the outline of the tritors (abrasive surfaces of each dental plate) shows an intermediate morphology between earlier records from the Cenomanian of New Zealand and those from the Eocene of Isla Marambio. This suggests an evolutionary trend in tritor morphology in the lineage leading to modern callorhynchids, during the Late Cretaceous-Palaeogene interval.

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