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The superfamily Alligatoroidea is thought to have split from the crocodile-gharial lineage in the late Cretaceous, about 80 million years ago, but possibly as early as 100 million years ago based on molecular phylogenetics. [1] [2] [3] Leidyosuchus of Alberta is the earliest known genus.
The superfamily Alligatoroidea includes all crocodilians (fossil and extant) that are more closely related to the American alligator than to either the Nile crocodile or the gharial. [1] This is a stem-based definition for alligators, and is more inclusive than the crown group Alligatoridae. [2]
Alligatorinae is a subfamily within the family Alligatoridae that contains the alligators and their closest extinct relatives, and is the sister taxon to Caimaninae (the caimans).
Alligators and crocodiles differ in some key ways, from their scales to teeth to snout shape and beyond. Watch the latest video from A-Z-Animals to discover fascinating facts about these two ...
Crocodile ISOs may also assist in detection of local salinity, or serve other chemosensory functions. [61] Less consistent differences: Crocodiles are generally thought of as more aggressive than alligators. [61] Only six of the 23 crocodilian species are considered dangerous to adult human beings, most notably the Nile crocodile and saltwater ...
Check out the latest A-Z-Animals video detailing key differences in physical characteristics, diet, and the preferred habitat of crocodiles and alligators. Lastly, we’ll make our prediction of ...
Three extant crocodilian species clockwise from top-left: saltwater crocodile (Crocodylus porosus), American alligator (Alligator mississippiensis), and gharial (Gavialis gangeticus) Crocodilia is an order of mostly large, predatory , semiaquatic reptiles , which includes true crocodiles , the alligators , and caimans ; as well as the gharial ...
Crocodiles (family Crocodylidae) or true crocodiles are large, semiaquatic reptiles that live throughout the tropics in Africa, Asia, the Americas and Australia.The term “crocodile” is sometimes used more loosely to include all extant members of the order Crocodilia, which includes the alligators and caimans (both members of the family Alligatoridae), the gharial and false gharial (both ...