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Ornithoscelida :: Ornithoscelida (n. pl.) A group of extinct Reptilia, intermediate in structure (especially with regard to the pelvis) between reptiles and birds..

Sauria :: Sauria (n. pl.) A division of Reptilia formerly established to include the Lacertilia, Crocodilia, Dinosauria, and other groups. By some writers the name is restricted to the Lacertilia..

Archaeopteryx :: Archaeopteryx (n.) A fossil bird, of the Jurassic period, remarkable for having a long tapering tail of many vertebrae with feathers along each side, and jaws armed with teeth, with other reptilian characteristics..

Vertebrata :: Vertebrata (n. pl.) One of the grand divisions of the animal kingdom, comprising all animals that have a backbone composed of bony or cartilaginous vertebrae, together with Amphioxus in which the backbone is represented by a simple undivided notochord. The Vertebrata always have a dorsal, or neural, cavity above the notochord or backbone, and a ventral, or visceral, cavity below it. The subdivisions or classes of Vertebrata are Mammalia, Aves, Reptilia, Amphibia, Pisces, Marsipobranchia, and Lep

Reptilian :: Reptilian (a.) Belonging to the reptiles.

Reptile :: Reptile (n.) One of the Reptilia, or one of the Amphibia..

Mesozoic :: Mesozoic (a.) Belonging, or relating, to the secondary or reptilian age, or the era between the Paleozoic and Cenozoic. See Chart of Geology..

Reptilia :: Reptilia (n. pl.) A class of air-breathing oviparous vertebrates, usually covered with scales or bony plates. The heart generally has two auricles and one ventricle. The development of the young is the same as that of birds..

Chelonia :: Chelonia (n. pl.) An order of reptiles, including the tortoises and turtles, peculiar in having a part of the vertebrae, ribs, and sternum united with the dermal plates so as to form a firm shell. The jaws are covered by a horny beak. See Reptilia; also, Illust. in Appendix..

Reptilian :: Reptilian (n.) One of the Reptilia; a reptile.

Lacertilia :: Lacertilia (n. pl.) An order of Reptilia, which includes the lizards..

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