Reptilia - Dinosauria - Ceratopsidae

Full reference: P. Dodson. 1986. Avaceratops lammersi: a new ceratopsid from the Judith River Formation of Montana. Proceedings of the Academy of Natural Sciences of Philadelphia 138(2):305-317

Parent taxon: Centrosaurinae according to A. A. Farke et al. 2011

Sister taxa: Albertaceratops, Brachyceratops, Centrosaurus, Coronosaurus, Diabloceratops, Monoclonius, Pachyrhinosaurini, Sinoceratops, Spinops, Styracosaurus

Subtaxa: Avaceratops lammersi

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Ecology: ground dwelling herbivore