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Few ankylosaurs are known from more than a single specimen, but the ankylosaurid  Euoplocephalus tutus  (from the Late Cretaceous of Alberta, Canada and Montana, USA) is represented by dozens of skulls and partial skeletons, and is therefore an important taxon for understanding intraspecific variation in ankylosaurs.  Euoplocephalus  is unusual compared to other dinosaurs from the Late Cretaceous of Alberta because it is recognized from the Dinosaur Park, Horseshoe Canyon, and Two Medicine formations. A comprehensive review of material attributed to  Euoplocephalus  finds support for the resurrection of its purported synonyms  Anodontosaurus lambei  and  Scolosaurus cutleri , and the previously resurrected  Dyoplosaurus acutosquameus .  Anodontosaurus  is found primarily in the Horseshoe Canyon Formation of Alberta and is characterized by ornamentation posterior to the orbits and on the first cervical half ring, and wide, triangular knob osteoderms.  Euoplocephalus  is primarily found in Megaherbivore Assemblage Zone 1 in the Dinosaur Park Formation of Alberta and is characterized by the absence of ornamentation posterior to the orbits and on the first cervical half ring, and keeled medial osteoderms on the first cervical half ring.  Scolosaurus  is found primarily in the Two Medicine Formation of Montana (although the holotype is from Dinosaur Provincial Park), and is characterized by long, back-swept squamosal horns, ornamentation posterior to the orbit, and low medial osteoderms on the first cervical half ring;  Oohkotokia horneri  is morphologically indistinguishable from  Scolosaurus cutleri .  Dyoplosaurus  was previously differentiated from  Euoplocephalus  sensu lato by the morphology of the pelvis and pes, and these features also differentiate  Dyoplosaurus  from  Anodontosaurus  and  Scolosaurus ; a narrow tail club knob is probably also characteristic for  Dyoplosaurus .

Euoplocephalus tutus and the Diversity of Ankylosaurid Dinosaurs in the Late Cretaceous of Alberta, Canada, and Montana, USA