For years, the oldest turtle fossils we could find had fully formed shells. Now, more primitive fossils are revealing the strange tale of how turtle shells evolved
Follow the Eunotosaurus: An Evolutionary Shell Game?
The origin of the turtle shell: Mystery solved
It's turtles all the way down in the fossil record
Turtle shell fossil? : r/fossilid
How the turtle got its shell: Amazing fossils are solving the mystery
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How Turtles Got Their Shells: Fossil of Extinct South African