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primitive reptile-like fossil birds of the Jurassic or early Cretaceous Archaeornithes , subclass Archaeornithes
huge herbivorous dinosaur of Cretaceous found in Argentina argentinosaur
any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs bird-footed dinosaur , theropod , theropod dinosaur
any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia ceratopsian , horned dinosaur
fish thought to have been extinct since the Cretaceous period but found in 1938 off the coast of Africa coelacanth , Latimeria chalumnae
swift agile wolf-sized bipedal dinosaur having a large curved claw on each hind foot; of the Cretaceous deinonychus
duck-billed dinosaurs; upper Cretaceous family Hadrosauridae , Hadrosauridae
later ichthyosaurs of the Jurassic and Cretaceous; widely distributed in both hemispheres family Ichthyosauridae , Ichthyosauridae
herbivorous dinosaurs of the Cretaceous family Titanosauridae , Titanosauridae
extinct reptile of the Jurassic and Cretaceous having a birdlike beak and membranous wings supported by the very long fourth digit of each forelimb flying reptile , pterosaur
genus of large duck-billed dinosaurs; late Cretaceous genus Anatotitan
armored herbivorous dinosaurs of the Cretaceous genus Ankylosaurus
enormous dinosaur of the middle Cretaceous found in Argentina genus Argentinosaurus
genus of duck-billed dinosaurs of late Cretaceous genus Corythosaurus
most primitive genus of horned dinosaurs; early Cretaceous genus Psittacosaurus
genus of large herbivorous dinosaurs of Cretaceous found in western North America genus Seismosaurus , Seismosaurus
quadrupedal armored herbivore of the Jurassic and Cretaceous genus Stegosaurus
small toothless saurischian dinosaurs; later Cretaceous period in Canada genus Struthiomimus
genus of herbivorous dinosaurs flourishing during the Cretaceous in South America genus Titanosaurus , Titanosaurus
huge herbivorous dinosaur of the Cretaceous found in western North America ground-shaker , seismosaur
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