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Amargasaurus (/ ə ˌ m ɑːr ɡ ə ˈ s ɔː r ə s /; "La Amarga lizard") is a genus of sauropod dinosaur from the Early Cretaceous epoch (129.4–122.46 mya) of what is now Argentina.The only known skeleton was discovered in 1984 and is virtually complete, including a fragmentary skull, making Amargasaurus one of the best-known sauropods of its epoch.
The group likely first diverged from the diplodocids in the middle Jurassic in North America and subsequently dispersed into Gondwana, with the most diversity in East Africa and South America. [6] Amargasaurus was the latest surviving dicraeosaurid genus, living into the Early Cretaceous period.
Many gigantic forms existed in the Late Jurassic (specifically Kimmeridgian), such as the turiasaur Turiasaurus, the mamenchisaurids Mamenchisaurus and Xinjiangtitan, the diplodocoids Maraapunisaurus, Diplodocus, Apatosaurus, Supersaurus and Barosaurus, the camarasaurid Camarasaurus, and the brachiosaurids Brachiosaurus and Giraffatitan.
They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued ...
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The Triassic (/ t r aɪ ˈ æ s ɪ k / try-ASS-ik; sometimes symbolized 🝈) [8] is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago (), to the beginning of the Jurassic Period 201.4 Mya. [9]
Sauropoda is a clade of dinosaurs that consists of roughly 300 species of large, long-necked herbivores and includes the largest terrestrial animals ever to exist. The first sauropod species were named in 1842 by Richard Owen, though at the time, he regarded them as unusual crocodilians.
Mass estimates for Amargasaurus have been noted to vary widely depending on the method used, [11] and studies using other methods, not yet applied to Amargatitanis, have found Amargasaurus to weigh 3.304 metric tons (3.642 short tons) [12] to 4.376 metric tons (4.824 short tons). [13]