order Ornithischia

Thesaurus

Noun

1.

order Ornithischia - extinct terrestrial reptiles having bird-like pelvises: armored dinosaurs (thyreophorans); boneheaded and horned dinosaurs (marginocephalians); duck-billed dinosaurs (euronithopods) Ornithischia animal order - the order of animals Archosauria, subclass Archosauria - a large subclass of diapsid reptiles including: crocodiles; alligators; dinosaurs; pterosaurs; plesiosaurs; ichthyosaurs; thecodonts ornithischian, ornithischian dinosaur - herbivorous dinosaur with a pelvis like that of a bird genus Pisanosaurus - primitive ornithischian dinosaur found in Argentina; early Triassic genus Staurikosaurus - primitive ornithischian dinosaur found in Brazil suborder Thyreophora, Thyreophora, thyreophoran - armored dinosaurs: stegosaurs and ankylosaurs Marginocephalia, marginocephalian, suborder Marginocephalia - includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs euronithopod, Euronithopoda, Ornithopoda, suborder Euronithopoda, suborder Ornithopoda - widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)