| Named By: | G. W. Rougier, M. S. de la Fuente & A. B. Arcucci in 1995 |
| Time Period: | Late Triassic - Holocene, 210-0 Ma Possible Early and Middle Triassic records in the form of fossil tracks[1] |
| Location: | Argentina - Los Colorados Formation |
| Size: | Shell about 70 centimetres long |
| Diet: | Herbivore |
| Fossil(s): | Almost complete individual |
| Classification: | | Chordata | Reptilia | Testudinata | |
Testudinata is the group of all tetrapods with a true turtle shell. It includes both modern turtles (Testudines) and many of their extinct, shelled relatives (stem-turtles). Though it was first coined as the group containing turtles by Klein in 1760, it was first defined in the modern sense by Joyce and colleagues in 2004. Testudinata does not include the primitive stem-turtle Odontochelys, which only had the bottom half of a shell.