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Prionochelys

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Taxonomy

Prionochelys was originally assigned to the family Toxochelyidae. A 2018 paper found it to be on the stem of Cheloniidae, the family to which most modern sea turtles belong, forming a monophyletic grouping with Ctenochelys and Peritresius. In 2019, Gentry et al. assigned Prionochelys to the extinct Ctenochelyidae family. A cladogram from their analysis:

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