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avatar_Halichoeres

Acherontiscus, the first heterodont tetrapod, redescribed with CT data

Started by Halichoeres, May 05, 2019, 07:27:09 PM

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Halichoeres

May 05, 2019, 07:27:09 PM Last Edit: May 05, 2019, 07:27:35 PM by Halichoeres
Jennifer Clack et al. reexamine the holotype of Acherontiscus caledoniae using micro-CT data, producing loads of new anatomical data and a new phylogenetic hypothesis. They find it sister to Aytonerpeton, and probably somewhere on the amniote stem. From the earliest Carboniferous, Acherontiscus is the earliest known heterodont tetrapod (that is, with teeth that differ in morphology, a signal of subdivision of dental labor).

Some of the new morphology, diagrammed (check out all those pterygoid teeth--I'd hate to be a Carboniferous arthropod):


Paper (open access in Royal Society Open Science): https://royalsocietypublishing.org/doi/10.1098/rsos.182087
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