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

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.

Earliest-Known Turtle Had No Shell and Plenty of Teeth

Egg Laying or Live Birth: How Evolution Chooses

OFFICIAL Denver Museum of Nature & Science : Early Origins of Turtles

Turtles have lived for 230 million years - but will they survive

OFFICIAL Denver Museum of Nature & Science : Early Origins of Turtles

Why Do Turtles Have Shells? - The Atlantic

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Newdesk Search, Page 312

Species Spotlight - Woodland Box Turtle (U.S. National Park Service)