World of Dinosaurs/Genosaurs

The clade of dinosaurs that had the derived trait of chewing were called Genosaurs.

Genosaurs
The name means "Cheek Lizards".

For more information on these, see Dinosaur Clades of Interest.
 * Genosaurs include almost all the most recognizable herbivores except for the long-necked sauropods.
 * Armored thyreophorans
 * Duck-billed ornithopods
 * Horned marginocephalians