The girdles of the oldest fossil turtle, Proterochersis robusta, and the age of the turtle crown

Proterochersis robusta from the Late Triassic (Middle Norian) of Germany is the oldest known fossil turtle (i.e. amniote with a fully formed turtle shell), but little is known about its anatomy. A newly prepared, historic specimen provides novel insights into the morphology of the girdles and verteb...

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