Apatosaurus (redirected from Apatosaurus ajax)

Apatosaurus (ăp'ətəsôr`əs, ā'păt'ə–), [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).

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Apatosaurus

Genus of giant herbivorous dinosaur, one of the largest land animals of all time. Apatosaurus lived between 147 million and 137 million years ago during the Late Jurassic and Early Cretaceous Periods in North America and Europe. It weighed as much as 30 tons and was as long as 70 ft (21 m), including the very long neck and tail. Formerly known as Brontosaurus because of incomplete fossil evidence, its head was depicted until 1978 as massive and snub-nosed, with spoonlike teeth; scientists now know the animal had a slender, elongated skull and long, peglike teeth. Skeletal evidence indicates that, despite their great bulk, apatosaurs were primarily land animals.

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Apatosaurus [ə‚pad·ə′sȯr·əs]

(paleontology)

A herbivorous sauropod dinosaur, approximately 70 feet (21 meters) long and weighing 30 tons, from the Jurassic Period that had much longer hindlimbs than forelimbs. Also known as Brontosaurus.