| Testudines were suggested to have diverged from other diapsids between 200 and 279 million years ago, though the debate is far from settled. |
| The system is present in urodeles, caecilians, anurans, testudines, mammals, and lepidosaurs. |
| Testudinology, also known as cheloniology, is the zoological study of animals belonging to the order Testudines or Chelonii. |
| Situating the phylogenetic origins of Testudines remains a continuing challenge. |
| In terms of molecular structure, the researchers found the order Testudines to be closely related to the more recently evolved order Crocodilia. |
| The first formal use of the word Testudines as a taxon name can be found in Batsch. |
