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