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

• Published in: Antarctic Science
• Main Authors: Otero, Rodrigo A., Rubilar-Rogers, David, Yury-Yañez, Roberto E., Vargas, Alexander O., Gutstein, Carolina S., Mourgues, Francisco Amaro, Robert, Emmanuel
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2012
• Subjects: Geology; Ecology, Evolution, Behavior and Systematics; Oceanography; New Zealand; Seymour; Seymour Island; Marambio; isla Marambio; Antarc*; Antarctic Science; Antarctica
• Online Access: http://dx.doi.org/10.1017/s095410201200079x; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S095410201200079X

Abstract 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.