Below is a list of links that will take you to each separate family of crocodylian. This is then followed by the genus and species. But before you go, might I suggest taking a peak at some of the areas in the above menu. That way you can learn exactly why crocodylians are the transitional animals that they are.
Click on the family of crocodylians you want to learn more about
Crocodylidae
Alligatoridae
Gavialidae