![]() It had a disproportionately long neck, small skull, and large overall size, all of which are typical for sauropods. Brachiosaurus is estimated to have been between 18 and 22 meters (59 and 72 ft) long body mass estimates of the subadult holotype specimen range from 28.3 to 46.9 metric tons (31.2 and 51.7 short tons). ![]() Riggs named the dinosaur Brachiosaurus altithorax the generic name is Greek for "arm lizard", in reference to its proportionately long arms, and the specific name means "deep chest". Riggs in 1903 from fossils found in the Colorado River valley in western Colorado, United States. It was first described by American paleontologist Elmer S. ![]() Brachiosaurus ( / ˌ b r æ k i ə ˈ s ɔː r ə s/) is a genus of sauropod dinosaur that lived in North America during the Late Jurassic, about 154 to 150 million years ago.
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