The primitive reptiles--including archosaurs, cynodonts, dicynodonts, synapsids, crocodilians and therapsids--that preceded or were contemporaneous with dinosaurs.
This huge, crocodile-like reptile preceded the dinosaurs.
One of the smallest of all the Cretaceous crocodiles.
One of the most primitive of the "mammal-like reptiles."
This bland-looking pelycosaur's name is Greek for "cheese."
One of the first archosaurs ever to be identified.
The first vegetarian crocodile ever to be discovered.
The most mammal-like of all ancient reptiles.
One of the biggest crocodiles of the Cretaceous period.
A crocodile-like archosaur with a fish-like head.
This ancient synapsid had a giant sail on its back.
This may (or may not) have been one of the earliest crocodiles.
This early land reptile was a cousin of Dimetrodon.
This tiny reptile may have been the ancestor of all crocodiles.
A tiny, fast, and voracious precursor to the true dinoaurs.
This aquatic reptile may have spent its entire life in the sea.
This "gorgon-faced" reptile preyed on its fellow therapsids.
One of the most dinosaur-like of all the Triassic crocodiles.
Could this have been the first reptile?
Could this have been the ancestor of all the dinosaurs?
This pig-like reptile preceded the dinosaurs.
One of the most common crocodiles of the Jurassic period.
One of the largest therapsids before the rise of the dinosaurs.
This Triassic archosaur looked a lot like a modern gharial.
Not a dinosaur, but a mammal-like reptile of the late Triassic.
This land crocodile competed for prey with early dinosaurs.
This crocodilian's nostrils were located on top of its head.
A Cretaceous "SuperCroc" that put modern crocodiles to shame.
This large, armored reptile lived long before the dinosaurs.
This ancient crocodile had an unusually short skull.
This primitive reptile was as clumsy as its name.
This crocodile-like archosaur was actually a vegetarian.
This giant crocodile fed on tiny plankton, like a sperm whale.
This cynodont had much in common with modern cats.
Its name means "titanic murderer," which may be an overstatement.
Could this have been the reptile from which all mammals evolved?
