Diadectomorpha

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What Wikipedia says

Diadectomorpha is a clade of large tetrapods that lived in Euramerica during the Carboniferous and Early Permian periods and in Asia during Late Permian (Wuchiapingian), They have typically been classified as advanced reptiliomorphs (transitional between "amphibians" sensu lato and amniotes) positioned close to, but outside of the clade Amniota, though some recent research has recovered them as the sister group to the traditional Synapsida within Amniota, based on inner ear anatomy and cladistic analyses.

Excerpt from the Wikipedia article “Diadectomorpha”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dmitry Bogdanov, CC BY-SA 3.0, via Wikimedia Commons.