Dinosaur Compendium Maximus
|Binomial name(s):||Apatosaurus ajax, excelsus, louisae, parvus|
|Maximum known size:||75 feet|
|Lived when:||Late Jurassic Period, 154–150 Ma|
|Classification:||Order: Saurischia; Infraorder: Sauropoda; Family: Diplodocidae; Subfamily: Apatosaurinae; Genus: Apatosaurus|
Apatosaurus /əˌpætɵˈsɔrəs/, sometimes known by the popular synonym Brontosaurus, is a genus of sauropod dinosaur that lived from about 154 to 150 million years ago, during the Jurassic Period (Kimmeridgian and early Tithonian ages). It was one of the largest land animals known to have ever existed, with an average length of 23 m (75 ft) and a mass of at least 16 metric tons (18 short tons)
Apatosaurus is a member of the family Diplodocidae, a clade of gigantic sauropod dinosaurs.
Apatosaurus was a large, long-necked quadrupedal animal with a long, whip-like tail. Its forelimbs were slightly shorter than its hindlimbs.
Othniel Charles Marsh, a Professor of Palaeontology at Yale University, described and named an incomplete (and juvenile) skeleton of Apatosaurus ajax in 1877