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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.
How did the turtle get its shell? - The Official PLOS Blog
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It's Turtles All the Way Down in the Fossil Record - The New York Times
OFFICIAL Denver Museum of Nature & Science : Early Origins of Turtles
Newly identified softshell turtle lived alongside T. rex and Triceratops
Learning about aging from turtles and other cold-blooded critters
Newdesk Search, Page 312
Why Are Sea Turtles Endangered and How Can We Save Them?
News Releases, Page 125
A Beachcomber's Guide to Shells and other Wildlife Found on the Seashore - Marine Dimensions
Discovery of lonely tortoise doubles known members of Galapagos species
