Invalid subtaxa: Acanthopholidae Nopcsa 1902, Acanthopholididae Nopcsa 1902, Acanthopholinae Nopcsa 1902, Acanthopholis horrida Huxley 1867 [nomen dubium], Acanthopholis horridus Huxley 1867 [nomen dubium], Hylaeosauridae Nopcsa 1902, Palaeoscincidae Nopcsa 1918
Full reference: O. C. Marsh. 1890. Additional characters of the Ceratopsidae, with notice of new Cretaceous dinosaurs. American Journal of Science 39:418-426
Parent taxon: Ankylosauria according to A. Osi and L. A. Makádi 2009
Sister taxa: Ankylosauridae, Anoplosaurus, Apulosauripus, Bissektipelta, Dracopelta, Hylaeosaurus, Polacanthidae, Cryptosaurus eumerus
Subtaxa: Aletopelta, Animantarx, Antarctopelta, Edmontonia, Edmontoniinae, Glyptodontopelta, Hungarosaurus, Liaoningosaurus, Niobrarasaurus, Nodosaurinae, Nodosaurus, Panoplosaurinae, Panoplosaurus, Pawpawsaurus, Peloroplites, Polacanthus, Sarcolestes, Sauropelta, Sauropeltinae, Silvisaurus, Stegopelta, Struthiosaurinae, Struthiosaurus, Syngonosaurus, Texasetes, Zhejiangosaurus, Zhongyuansaurus
Type: Nodosaurus
Ecology: ground dwelling herbivore