Origin of the white shark Carcharodon (Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru

Dana J. Ehret, Bruce J. Macfadden, Douglas S. Jones, Thomas J. Devries, David A. Foster, Rodolfo Salas-Gismondi

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Abstract

The taxonomic origin of the white shark, Carcharodon, is a highly debated subject. New fossil evidence presented in this study suggests that the genus is derived from the broad-toothed 'mako', Carcharodon (Cosmopolitodus) hastalis, and includes the new species C. hubbelli sp. nov. - a taxon that demonstrates a transition between C. hastalis and Carcharodon carcharias. Specimens from the Pisco Formation clearly demonstrate an evolutionary mosaic of characters of both recent C. carcharias and fossil C. hastalis. Characters diagnostic to C. carcharias include the presence tooth serrations and a symmetrical first upper anterior tooth that is the largest in the tooth row, while those indicative of C. hastalis include a mesially slanted third anterior (intermediate) tooth. We also provide a recalibration of critical fossil horizons within the Pisco Formation, Peru using zircon U-Pb dating and strontium-ratio isotopic analysis. The recalibration of the absolute dates suggests that Carcharodon hubbelli sp. nov. is Late Miocene (6-8Ma) in age. This research revises and elucidates lamnid shark evolution based on the calibration of the Neogene Pisco Formation.
Original languageAmerican English
Pages (from-to)1139-1153
Number of pages15
JournalPalaeontology
Volume55
Issue number6
DOIs
StatePublished - 1 Nov 2012

Keywords

  • Carcharocles
  • Cosmopolitodus
  • Geochronology
  • Isurus
  • Miocene
  • Strontium

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    Ehret, D. J., Macfadden, B. J., Jones, D. S., Devries, T. J., Foster, D. A., & Salas-Gismondi, R. (2012). Origin of the white shark Carcharodon (Lamniformes: Lamnidae) based on recalibration of the Upper Neogene Pisco Formation of Peru. Palaeontology, 55(6), 1139-1153. https://doi.org/10.1111/j.1475-4983.2012.01201.x