Re-evolution of Teeth in a Frog
Weins’ results provide an exceptionally well documented example of re-evolution, demonstrating that mandibular teeth were lost in the ancestor of all living frogs and then re-evolved in the hemiphractid species . Weins points out that the re-evolution of mandibular teeth may not surprise herpetologists, but notes this example has been ignored in the recent literature on Dollo's law. The time involved from the loss of teeth to their re-evolution in Gastrotheca – an absence of at least 225 million years (and probably longer) is remarkable.
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Wiens, J. J. 2011. Re-evolution of lost mandibular teeth ion frogs after more than 200 million years, and re-evaluating Dollo’s law. Evolution, doi: 10.1111/j.1558-5646.2011.01221.x