Scolosaurus is an extinct genus of ankylosaurid dinosaurs within the subfamily Ankylosaurinae. It is known from the lower levels of the Dinosaur Park Formation and upper levels of the Oldman Formation in the Late Cretaceous of Alberta, Canada. It contains two species, S. cutleri and S. thronus. The type species, S. cutleri, measured up to 5.6 metres (18Â ft) in length and 2.2 metric tons in body mass.
Scolosaurus
S. cutleri holotype specimen NHMUK R5161 at Natural History Museum, London
Skull MOR 433 of Oohkotokia, a possible junior synonym
Referred S. cutleri skull, AMNH 5404
Ankylosauridae is a family of armored dinosaurs within Ankylosauria, and is the sister group to Nodosauridae. The oldest known Ankylosaurids date to around 122 million years ago and went extinct 66 million years ago during the Cretaceous–Paleogene extinction event. These animals were mainly herbivorous and were obligate quadrupeds, with leaf-shaped teeth and robust, scute-covered bodies. Ankylosaurids possess a distinctly domed and short snout, wedge-shaped osteoderms on their skull, scutes along their torso, and a tail club.
Ankylosauridae
Skull of first known ankylosaurid specimen, belonging to Ankylosaurus
Club of indeterminate ankylosaurine, CMN 349
Gastonia and other polacanthine dinosaurs have uncertain placement, possibly within Ankylosauridae