ammonites
Planicoxa DiCroce and Carpenter 2001 (bird foot dinosaur)

Archosauria - Dinosauria - Dryosauridae

Full reference: T. DiCroce and K. Carpenter. 2001. A new ornithopod from the Cedar Mountain Formation (Lower Cretaceous) of eastern Utah. D. H. Tanke and K. Carpenter (eds.), Mesozoic Vertebrate Life. Indiana University Press, Bloomington 183-196

Parent taxon: Dryosauridae according to D. B. Norman 2004

Sister taxa: Callovosaurus, Dryosaurus, Dysalotosaurus, Elrhazosaurus, Kangnasaurus, Valdosaurus

Subtaxa: Planicoxa venenica

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Ecology: ground dwelling herbivore