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World of Dinosaurs/Genosaurs
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The clade of dinosaurs that had the derived trait of chewing were called Genosaurs.
Genosaurs
The name means "Cheek Lizards".
Genosaurs include almost all the most recognizable herbivores except for the long-necked sauropods.
Armored thyreophorans
Duck-billed ornithopods
Horned marginocephalians
For more information on these, see Dinosaur Clades of Interest.