Data from: Acherontiscus caledoniae, the earliest heterodont and durophagous tetrapod

Jennifer Clack, Marcello Ruta, Andrew Milner, John Marshall, Timothy Smithson & Keturah Smithson
The enigmatic tetrapod Acherontiscus caledoniae from the Pendleian stage of the Early Carboniferous shows heterodontous and durophagous teeth, representing the earliest known examples of significant adaptations in tetrapod dental morphology. Tetrapods of the Late Devonian and Early Carboniferous (Mississippian), now known in some depth, are generally conservative in their dentition and body morphologies. Their teeth are simple and uniform, being cone-like and sometimes recurved at the tip. Modifications such as keels occur for the first...
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