Turtles, embryos, and fossils

Tartaruga

Never thought I would post a vertebrate on this website… but having shoulders inside the rib cage made me make an exception, poor guys. I wrote a text about the development and evolution of the turtle shell at The Node. 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:

Turtles in a nutshell

[photo by Algy3289]