Turtles, embryos, and fossils

I wrote a text about the development and evolution of the turtle shell on The Node: Turtles in a nutshell.

Turtle at Henry Doorly Zoo, Omaha. Photo by Algy3289.

It shows the beginning of shell formation in embryos and how this can help us understand the evolution of such unique body pattern. 3D animations and fossils are included!

Never thought I would post a vertebrate on this website… but having shoulders inside the rib cage made me make an exception, poor things :p