| Meaning | Extinct terrestrial / terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods). |
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| Synonym | Ornithischia |
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| Member of | Archosauria, subclass Archosauria | A large subclass of diapsid reptiles including |
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| Members | Euronithopoda, suborder Euronithopoda, euronithopod, Ornithopoda, suborder Ornithopoda | widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon) |
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| Marginocephalia, suborder Marginocephalia, marginocephalian | Includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs |
| Thyreophora, suborder Thyreophora, thyreophoran | armored dinosaurs |
| genus Pisanosaurus | Primitive ornithischian dinosaur found in Argentina |
| genus Staurikosaurus | Primitive ornithischian dinosaur found in Brazil |
| ornithischian, ornithischian dinosaur | herbivorous dinosaur with a pelvis like that of a bird |
| Broader | animal order | The order of animals |
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| Spanish | ornitisquios |
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| Catalan | Ornithischia, Ornitisqui, ornitisquis |
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