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

作者：Otero Rodrigo A^*; Rubilar Rogers David; Yury Yanez Roberto E; Vargas Alexander O; Gutstein Carolina S; Amaro Mourgues Francisco; Robert Emmanuel

来源：Antarctic Science, 2013, 25(1): 99-106.

DOI：10.1017/S095410201200079X

• Antarctic Peninsula
• Callorhinchus torresi sp nov.
• cartilaginous fish

We describe a new chimaeriform fish, Callorhinchus torresi sp. nov., from the uppermost Cretaceous (late Maastrichtian) of the Lopez 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.

• 出版日期2013-2