#psittacosaur__psittacosaurus primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind and short front limbs; may have been bipedal supertype: ceratopsian__horned_dinosaur any of several four-footed herbivorous horned dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia member of: genus_Psittacosaurus most primitive genus of horned dinosaurs; early Cretaceous member of: suborder_Ceratopsia__Ceratopsia horned dinosaurs member of: suborder_Marginocephalia__Marginocephalia__marginocephalian includes bone-headed (pachycephalosaurs) and horned (ceratopsian) dinosaurs member of: order_Ornithischia__Ornithischia extinct terrestrial reptiles having birdlike pelvises: armored dinosaurs (thyreophorans); bone-headed and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods) member of: subclass_Archosauria__Archosauria a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts member of: class_Reptilia__Reptilia class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals member of: subphylum_Vertebrata__Vertebrata__Craniata__subphylum_Craniata fishes; amphibians; reptiles; birds; mammals member of: phylum_Chordata__Chordata comprises true vertebrates and animals having a notochord member of: kingdom_Animalia__Animalia__animal_kingdom taxonomic kingdom comprising all living or extinct animals
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