Why turtles have shells: Eunotosaurus fossil reveals shell evolution.

How Turtles Got Their Shells (VIDEO)

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May 31 2013 2:58 PM

How Turtles Got Their Shells (VIDEO)

A fossil of the Eunotosaurus displays the earliest known stages of evolution that have led to the modern turtle, including nine broadened ribs and a lack of intercostal muscles.

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