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A fragment of upper jaw fossil from the Early Cretaceous is among the oldest examples of a toothless amphibian in the fossil record
Chihiro Kai
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Jack Tamisiea
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Naomi Greenberg
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Emma Saaty
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Emily Driehaus
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Ellyn Lapointe
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Newly Described Fossil From Wyoming Sheds Light on When Frogs and Toads Lost Their Teeth
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