List of North American dinosaurs

Invalid and potentially valid genera

• "Beelemodon": Known only from two teeth found in Wyoming. They share features of compsognathids, dromaeosaurids and basal oviraptorosaurs.
• "Capitalsaurus": The official dinosaur of the District of Columbia. It is known from a single vertebra discovered at the intersection of First and F Streets S.E., which is now appropriately named "Capitalsaurus Court".Cathetosaurus lewisi: Usually seen as a species of Camarasaurus, but an unpublished study argues that it might be a distinct genus.Claorhynchus trihedrus: An indeterminate cerapod that may be either a hadrosaurid or a ceratopsid, in which case it may be a synonym of Triceratops.
• "Coelosaurus" antiquus: The generic name is said to be preoccupied, but its namesake remains obscure.
• "Comanchesaurus kuesi": Only named in a dissertation. It has been described as a possible indeterminate saurischian.Deinodon horridus: Only known from teeth. Several referred teeth have since been found to belong to already known species, and the holotype itself could belong to Gorgosaurus.Dracorex hogwartsia: Described as a small, flat-headed pachycephalosaur. However, it is likely that it is just a juvenile Pachycephalosaurus.Drinker nisti: May be a synonym of Nanosaurus, but a recent analysis suggests that some features of its teeth are also present in pachycephalosaurs. If this assignment is correct, it would make this taxon the only pachycephalosaur known from the Jurassic.Epanterias amplexus: Possibly a large specimen of Allosaurus, but it may be a different taxon due to its younger age.Latenivenatrix mcmasterae: The largest known troodontid. It is sometimes suggested to be synonymous with Stenonychosaurus, which its remains were originally assigned to.
• "Magulodon muirkirkensis": Only known from a single tooth that may belong to either an ornithopod or a basal ceratopsian.
• "Microcephale": Said to be an extremely small pachycephalosaur, with skull caps only long.Mojoceratops perifania: May be a synonym of Chasmosaurus.Nedoceratops hatcheri: Due to its lack of a nasal horn, it has been named "Diceratops" and Diceratus. However, it may simply be an unusual specimen of Triceratops.Ojoceratops fowleri: May be ancestral to Triceratops or a synonym of Eotriceratops.
• "Orcomimus": Potentially attributable to any of the ornithomimosaur taxa known from the Hell Creek Formation.Othnielia rex: Only known from an undiagnostic femur, but it may have belonged to Nanosaurus anyway.Othnielosaurus consors: Most likely a synonym of Nanosaurus.Palaeopteryx thomsoni: Known from a few very small bones which could belong to either a bird or a small bird-like dinosaur.Protoavis texensis: Described as a Triassic bird but is most likely a chimera consisting of elements from various unrelated tetrapods.Rhinorex condrupus: Phylogenetic analysis shows that it may fall within Gryposaurus, and thus be a junior synonym of that genus.Rubeosaurus ovatus: Likely a species of Styracosaurus, or even simply an unusual specimen of S. albertensis.Stygimoloch spinifer: Had a short skull dome with long horns jutting out from behind it. It is usually thought to be a subadult Pachycephalosaurus, but has been noted to be stratigraphically younger. Three attributed specimens recovered from the Ferris Formation, which is the taxon's southernmost occurrence, would make it distinct from the aforementioned genus.Stygivenator molnari: Uncertain whether it belongs to Tyrannosaurus or Nanotyrannus.Tatankaceratops sacrisonorum: Noted to possess a strange mix of features of both juvenile and adult Triceratops. It may be a dwarf specimen of that genus or an individual that stopped growing prematurely.

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