Stegosaurus and ankylosaurus are united in a group called; Thyreophora
Stegosaurus and ankylosaurus are united in a group called Thyreophora. They belong to that group because under the classification of dinosaurs, the Thyreophora consist mainly of Stegosauria which are commonly known as the plated dinosaurs and Ankylosauria which are commonly called the armored dinosaurs.
It should be noted that this group could also include their more basal relatives like Scutellosaurus and Scelidosaurus.
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