Crocodyloidea
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Crocodyloidea is one of three superfamilies of crocodilians, the other two being Alligatoroidea and Gavialoidea, and it includes the crocodiles. Crocodyloidea may also include the extinct Mekosuchinae
Alligatoridae
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The family Alligatoridae of crocodilians includes alligators, caimans and their extinct relatives.
A. olseni fore limb
Alligator prenasalis fossil
C. crocodilus at the Helsinki Tropicario Zoo aquarium in Helsinki, Finland in 2010