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Crocodiles | Snakes | Turtles | Lizards | Tuatara |
| Reptiles have either anapsid or diapsid skulls |
| Anapsid skulls |
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Anapsid skulls lack temporal openings (no holes in the yellow area of the skull in the diagram) Turtles are the only anapsid reptiles alive today |
 Anapsid skull |
 Example of a turtle anapsid skull from the museum |
| Diapsid skulls |
Diapsid skulls have two temporal openings (two holes in the yellow area of the skull in the diagram) Lizards, snakes, tuatara and crocodiles all have diapsid skulls |
 Diapsid skull |
Example of a crocodile diapsid skull from the museum |