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Diplodocus(dĭplŏd`əkəs) [Gr., = double beam (or rafter)], immense quadruped herbivorous 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. found in the late Jurassic strata of the Colorado, Utah, and Wyoming. It had a long whiplash tail and a small horselike head with nostrils placed high, just below and between the eyes. Highly placed nostrils are also found in such living animals as elephants and sperm whales, leading to theories that Diplodocus possessed an elephantlike trunk or that it was a water-dweller, able to both see and breathe by raising only the top of its head out of the water. Downward-pointing vertebral projections of the midsection of the tail spread into an inverted T, the double beam of its name, which may have acted to brace the tail when it was resting on the ground. It had front teeth for biting off vegetation and possessed a croplike digestive organ in which swallowed stones, called gastroliths, presumably churned and broke up food fibers and mixed in digestive fluids. A huge saurischian sauropod, Diplodocus could reach a length of nearly 90 ft (27 m) but was more slender and lighter in weight than the related ApatosaurusApatosaurus
, [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). The similar dinosaur formerly called Brontosaurus [Gr.
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a genus of extinct saurischian reptiles of the suborder Sauropoda. They grew to a length of 25 m and had very long tails and necks and relatively small heads. There were several species, and they were herbivorous. Their remains have been found in the United States in deposits from the Jurassic period.