List the four groups of living reptiles?

Crocodilia, Sphenodonotia, Squamata, Testudines

four groups of living reptiles is as follows

1. Crocodilia, which includes crocodiles and alligators;

2. Sphenodontia, or tuataras;

3. Squamata, which includes lizards and snakes; and

4. Testudines, such as turtles and tortoises