Keichousaurus hui, marine reptile Troodon a natural endocast of the

a natural endocast of the braincase

Conchoraptor gracilis juvenile in matrix

The answer is simple -- DEFENSE

Its teeth had enamel with a folded pattern

polyodon to the exclusion of other alligatorines

Keichousaurus hui, marine reptile Troodon a natural endocast of theKeichousaurus hui was a semi aquatic reptile from Triassic China. They are believed to have lived in a marshy environment. Due to a robust ulna, it is believed that they were able to make their way onto land. They are considered members of the Pachypleurosauridae, which also included its contemporary the Nothosauridae. The genus name, Keichousaurus, is derived from the location where it was first found in 1957, Keichou Province. Pachypleurosaurs are