Alligatoroidea
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Alligatoroidea is one of three superfamilies of crocodylians, the other two being Crocodyloidea and Gavialoidea. Alligatoroidea evolved in the Late Cretaceous period, and consists of the alligators an
Two american alligators
An alligator nest at Everglades National Park, Florida, United States
Alligator olseni forelimb
Alligator prenasalis fossil
Alligatoridae
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The family Alligatoridae of crocodilians includes alligators, caimans and their extinct relatives.
Alligatoroidea
…the Nile crocodile) or Gavialis gangeticus (the gharial). This is a stem-based definition for alligators, and is more inclusive than the crown group Alligatoridae. As a crown group, Alligatoridae only includes the last common ancestor of all extant (living) alligators, caimans, and their descendants (living or…
Florida Alligator
C. crocodilus at the Helsinki Tropicario Zoo aquarium in Helsinki, Finland in 2010