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Brontosaurus (/ ˌ b r ɒ n t ə ˈ s ɔːr ə s /; [1] [2] meaning "thunder lizard" from the Greek words βροντή, brontē "thunder" and σαῦρος, sauros "lizard") is a genus of herbivorous sauropod dinosaur that lived in present-day United States during the Late Jurassic period.
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. [1] It was first described by American paleontologist Elmer S. Riggs in 1903 from fossils found in the Colorado River valley in western Colorado, United States.
Fossils of Brontosaurus are relatively uncommon whereas Apatosaurus is the second most common sauropod in the formation, after Camarasaurus. Apatosaurus and Brontosaurus may have been more solitary animals than other Morrison Formation dinosaurs. [115] Both genera existed for a long interval, and were found in most levels of the Morrison.
The Brontosaurus and Brachiosaurus are perhaps the most famous of the sauropods, dinosaurs defined by their long necks, long tails, small heads and four pillar-like legs.
Brontosaurus has long been considered a junior synonym of Apatosaurus; its type species was reclassified as A. excelsus in 1903. A 2015 study concluded that Brontosaurus is a valid genus of sauropod distinct from Apatosaurus, but not all paleontologists agree with this division.
As most dinosaur paleontologists have advocated a shift away from traditional, ranked Linnaean taxonomy in favor of rankless phylogenetic systems, [3] few ranked taxonomies of dinosaurs have been published since the 1980s.
From these specimens he named Brachiosaurus [5] and Brachiosauridae, [6] and presented evidence that Apatosaurus and Brontosaurus were the same genus of dinosaur. [ a ] [ 7 ] He also proposed that sauropods were terrestrial animals, based on their limb structure, [ 6 ] but this was largely dismissed in favor of aquatic sauropods until the 1970s ...
The Morrison Formation records an environment and time dominated by gigantic sauropod dinosaurs, such as Apatosaurus, Barosaurus, Brachiosaurus, Brontosaurus, and Camarasaurus. [8] Its great size may have been a deterrent to the predators Allosaurus and Ceratosaurus : their remains have been found in the same strata , which suggests that they ...