Apatosaurus

Apatosaurus , [Gr.,=deceptive lizard], quadruped saurischian dinosaur , estimated to be from 70 to 90 ft (21 to 27 m) in length and to weigh up to 30 tons (27 metric tons). Apatosaurus was called Brontosaurus [Gr.,=thunder lizard] until it was discovered that the two animals were, in fact, the same. Paleontologist O. C. Marsh named a specimen he uncovered in 1877 Apatosaurus ajax. Marsh discovered parts of a second fossil skeleton in 1879 and, not recognizing it as the same animal, called it Brontosaurus excelsius. Since the name Apatosaurus was published first, it takes priority as the valid name, although Brontosaurus continues to be used popularly. It is one of the best known dinosaurs.

Apatosaurus had a long, whiplike tail, stout legs, and a long neck. It was herbivorous and dwelled on land, possibly in forests, using its long neck to feed from trees. The eyes and nostrils were located toward the top of the skull. It flourished in the late Jurassic period. Apatosaurus bones and those of other sauropods have long been excavated in the Morrison formation of the late Jurassic and early Cretaceous strata in Colorado, Wyoming, and other Western states. No satisfactory skull specimen has been discovered attached to an Apatosaurus, and for many years an incorrect Camarasaurus -like head was mounted on the famous skeleton on display at the American Museum of Natural History in New York City. Apatosaurus is related to Diplodicus and Barosaurus.

Bibliography: See S. J. Gould, Bully for Brontosaurus (1991).

Apatosaurus One of several gigantic saurischian dinosaurs recorded from the Upper Jurassic. Apatosaurus was a sauropod, a quadruped with a long neck, the total weight of which reached 30 tonnes. The name Apatosaurus is a senior synonym of Brontosaurus (i.e. it was the earlier of the two names). Animals of 22 m in length have been recorded from the Morrison Formation of N.America.

Apatosaurus (order Saurischia, suborder Sauropoda) One of several gigantic dinosaurs recorded from the Upper Jurassic, Apatosaurus was a quadruped with a long neck whose total weight reached 30 tonnes. The name Apatosaurus, meaning ‘deceptive lizard’ (derived from the Greek apate meaning ‘deceit’ and saura meaning ‘lizard’), is a senior synonym of Brontosaurus. Animals of 22 m in length have been recorded from the Morrison Formation of N. America.