Scientists Discover That Turtles Began Living in Shells Much

Unique among Earth’s creatures, turtles are the only animals to form a shell on the outside of their bodies through a fusion of modified ribs, vertebrae and shoulder girdle bones. The turtle shell is a unique modification, and how and when it originated has fascinated and confounded biologists for more than two centuries.

Scientists Discover That Turtles Began Living in Shells Much Earlier Than Once Thought

Newly Discovered Turtle Ancestors Chomped With Beaks But Bore No Shells, Smart News

Paleozoic U.S. Geological Survey

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A Beachcomber's Guide to Shells and other Wildlife Found on the Seashore - Marine Dimensions

Researchers discover real reason why turtles have shells

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Hawksbill Sea Turtle - The Australian Museum

Turtle shell - Wikipedia

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How did the turtle get its shell?