Also found in: Dictionary, Thesaurus, Wikipedia.


(ăp'ətəsôr`əs, ā'păt'ə–), [Gr.,=deceptive lizard], quadruped saurischian dinosaurdinosaur
[Gr., = terrible lizard], extinct land reptile of the Mesozoic era. The dinosaurs, which were egg-laying animals, ranged in length from 2 1-2 ft (91 cm) to about 127 ft (39 m).
..... Click the link for more information.
, estimated to be from 70 to 90 ft (21 to 27 m) in length and to weigh up to 30 tons (27 metric tons). The similar dinosaur formerly called Brontosaurus [Gr.,=thunder lizard] was reclassified as Apatosaurus after it was determined 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 excelsus. When the two animals were determined in the early 1900s to be same, the name Apatosaurus, which was published first, took priority as the valid name. Brontosaurus, however, continued to be used popularly, and it became one of the best known dinosaurs. A 2015 study argued that the animals should be divided into two genera due to differences in the surviving specimens' skeletons and that the name Brontosaurus should be restored.

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.


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

The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/


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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Discussion: Lapparent and Zbyszewski (1957) assigned this vertebra to Apatosaurus alenquerensis.
The brand is now launching its first four dinosaur-theme plush toys, including the Tyrannosaurus Rex, Triceratops, Apatosaurus and Velociraptor.
It turns out that for over 100 years, while Brontos were widely used across movies and games, they were known to the scientific community as Apatosaurus. Bronto was simply a cooler and popular name, which caught on from an apparently wrong classification.
I would make friends with a Brachiosaurus and a Apatosaurus and become Tall Ben Osaurus!
'Jurassic World' Apatosaurus, Triceratops And T-Rex Revealed [(http://au.ibtimes.com/articles/576136/20141216/jurassic-world-dinosaurs-park-movie.htm#.VJJT3dKUdCg) Read ]
However, in 1903 researchers determined that the Brontosaurus bones were actually the bones of an Apatosaurus dinosaur mistakenly coupled with the skull of a Camarasaurus dinosaur--and the researchers concluded that there was no such thing as a Brontosaurus dinosaur.
"Places such as museums, exhibition centres and malls can rent out the skeleton as a temporary exhibit," said Al Mutaw, who brought the Apatosaurus dinosaur 'Einstein' to Abu Dhabi Airport for a 2008 exhibition.
Some dinosaurs ripped off leaves and branches, while others, like the Apatosaurus, raked food into their mouths.
Set during the Cretaceous, Bronto, Friend of Ceratops follows a young Apatosaurus named Bronto, and Bronto's friends, the three-horned Ceratops.
The largest sauropods frequently weighed more than 30 tons and included massive species such as Diplodocus and Apatosaurus.
It's proof that ancient history--really, really ancient history--is anything but boring, as the route leads you through one of the most fossil-rich regions in the world, former home to titans like Allosaurus and Apatosaurus. Added bonus: gorgeous red rock and mountain scenery, world-class museums, and inexpensive motels and restaurants.
Marsh described and named Apatosaurus and Brontosaurus, two genuses of sauropod dinosaurs.