Eusuchia

The Eusuchia ("true crocodiles") are a clade of crocodylomorphs that first appears in the Early Cretaceous with Hylaeochampsa. All living crocodilian species are eusuchians, as are many extinct forms. Unlike primitive crocodylomorphs, crocodyliforms have secondary bony palates. This feature enables living crocodylians to safely breathe in through their nostrils while the rest of the head (including the mouth) remains submerged. This structure reaches its greatest elaboration among eusuchians, in which the internal nares are completely surrounded by the pterygoid bones. For more information visit the Wikipedia entry Get back to Diapsida
†Pristichampsus	Gharial	Nile crocodile
Saltwater crocodile	Slender-snouted crocodile	African dwarf crocodile
Orinoco crocodile	Johnston's crocodile	Cuban crocodile
False gharial	American alligator	Black caiman
Dwarf Caiman