Crocodiles, alligators
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The SuchiaThe Suchia have the shared derived character of a reduced and triangular lower temporal opening (2). Three groups comprise the Suchia: 1) the Rauisuchia; 2) the Aetosauria; and 3) the Crocodylomorpha. The Rauisuchia were the largest and fiercest of the carnivores of the Triassic. Some species became gigantic with some forms having skulls more than a meter long. Their shared derived character is a slit between the premaxilla and maxilla (5). For the most part they remained quadrupedal. Postosuchus from the Chinle Group and the Newark Supergroup of North Carolina is an example. 
Skeleton of Postosuchus, after Long and Muray (1996).
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