Are the Ranidae (Anura, Amphibia) known prior to the Oligocene?

in Amphibia-Reptilia
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Up to the present, early records of supposed Ranidae have been reported from the ante-Oligocene and even as early as the middle Jurassic. These anurans should be either rejected from the Ranidae (most of them) or considered only as possible ranids. On the other hand, some authors have indicated that ranids are known only since the Oligocene . It is demonstrated here that true ante-Oligocene ranids occur in Europe (in the upper Eocene) . They predate an important paleobiological event: the "Grande Coupure". These eocene ranids could be autochthonous, thus conveying the suggestion that Europe is the center of origin of the family, but this seems very unlikely. An alternative hypothesis is that these ranids are immigrants from Asia.

Are the Ranidae (Anura, Amphibia) known prior to the Oligocene?

in Amphibia-Reptilia

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