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In the theropod lineage leading to birds, body size shrank continuously over a period of 50 million years, from an average of 163 kilograms (359 lb) down to 0.8 kg (1.8 lb). This was the only dinosaur lineage to get continuously smaller over such an extended time period, and their skeletons developed adaptations at about four times the average ...
The longest complete dinosaur is the 27 meters (89 ft) long Diplodocus, which was discovered in Wyoming in the United States and displayed in Pittsburgh's Carnegie Museum of Natural History in 1907. [147] The longest dinosaur known from good fossil material is Patagotitan: the skeleton mount in the American Museum of Natural History in New York ...
End Ordovician: 440 million years ago, 86% of all species lost, including graptolites. Late Devonian: 375 million years ago, 75% of species lost, including most trilobites. End Permian, The Great Dying: 251 million years ago, 96% of species lost, including tabulate corals, and most trees and synapsids.
Mamenchisaurus (/ m ə ˌ m ʌ n tʃ i ˈ s ɔː r ə s / mə-MUN-chee-SOR-əs, Dinosauria Translation and Pronunciation Guide M or spelling pronunciation / m ə ˌ m ɛ n tʃ ɪ ˈ s ɔː r ə s /) is a genus of sauropod dinosaur known for their remarkably long necks [2] which made up nearly half the total body length. [3]
Titanosauriformes was a globally distributed, long-lived clade of dinosaurs that contained both the largest and smallest known sauropods. [10] This clade was composed of three distinct groups: Brachiosauridae, a mix of Late Jurassic and Early Cretaceous sauropods , Euhelopodidae , a group of mid- Cretaceous East Asian sauropods , and ...
Parasaurolophus (/ ˌ p ær ə s ɔː ˈ r ɒ l ə f ə s,-ˌ s ɔːr ə ˈ l oʊ f ə s /; meaning "beside crested lizard" in reference to Saurolophus) [2] is a genus of hadrosaurid "duck-billed" dinosaur that lived in what is now western North America and possibly Asia during the Late Cretaceous period, about 76.9–73.5 million years ago. [3]
Argentinosaurus is a genus of giant sauropod dinosaur that lived during the Late Cretaceous period in what is now Argentina.Although it is only known from fragmentary remains, Argentinosaurus is one of the largest known land animals of all time, perhaps the largest, measuring 30–35 metres (98–115 ft) long and weighing 65–80 tonnes (72–88 short tons).
The Cretaceous (IPA: / krɪˈteɪʃəs / krih-TAY-shəss) [2] is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ...