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Oldest record of the Great White Shark (Lamnidae, Carcharodon; Miocene) in the Southern Atlantic

2012; Elsevier BV; Volume: 45; Issue: 2 Linguagem: Inglês

10.1016/j.geobios.2011.06.002

1777-5728

Alberto Luis Cione, Daniel Alfredo Cabrera, María Julia Barla,

Fish biology, ecology, and behavior

Lamnid teeth close to but slightly more primitive than Carcharodon carcharias were collected in late Miocene beds of the Paraná Formation in the central eastern Argentina.Some authors suggested that this species originated by phyletic evolution in the Pacific.The geographic and stratigraphic evidence shows that the putative sister species of C. carcharias, "Isurus" xiphodon, occurred in the Miocene but not in the Pliocene beds of the Pacific coast of South and North America and C. carcharias (or the transitional forms) occurred in the late Miocene-Pliocene of the same area."Isurus" xiphodon was present in the Miocene and Pliocene beds of the Atlantic ingressions of North America, South America, and Europe but C. carcharias was only present in Pliocene beds of the same area.According to present knowledge, it appears that C. carcharias originated in the Pacific and dispersed from there to the rest of the world during the latest Miocene-Pliocene."I." xiphodon should have become extinct in the Pacific at the end of the Miocene.In Entre Ríos, the Carcharodon cf.carcharias was sympatric with "I." xiphodon.