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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.
==Description==
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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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