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The first exact clade definition of Stegosauria was given by Peter Malcolm Galton in 1997: all thyreophoran Ornithischia more closely related to Stegosaurus than to Ankylosaurus. [21] This definition was formalized in the PhyloCode by Daniel Madzia and colleagues in 2021 as "the largest clade containing Stegosaurus stenops , but not ...
The first fossils of Stegosaurus were discovered in Colorado in 1877, a year after the state entered the Union (1876). [104] On July 17, 2024, a nearly complete, 27-foot (8.2m) long Stegosaurus skeleton, nicknamed "Apex", fetched $44.6m (£34m) at a Sotheby's auction in New York City–the most ever paid for a fossil. [105]
Stegosaurus [7] S. armatus [14] Colorado, Brushy Basin [16] [41] Several caudal vertebrae and assorted fragmentary postcranial elements. [41] S. armatus is both the first Stegosaurus to be discovered and the type species. [42] Its type specimen is poorly preserved, incomplete, and lacks diagnostic features. [41]
The first scientifically documented stegosaur remains were recovered from Early Cretaceous strata in England during the mid-19th century. [1] However, they would not be recognized as a distinct group of dinosaurs until Othniel Charles Marsh described the new genus and species Stegosaurus armatus in 1877 , which he regarded as the founding ...
The massive specimen, named Apex, will be on display at the American Museum of Natural History for four years, the museum said.
They include fossilized dinosaur ribs, vertebrae, and leg bones, as well as teeth, and a variety of other identifications, including turtle and lungfish fossils. Among the fossils identified here were the first-named Stegosaurus fossils, two types of sauropod fossils (Apatosaurus and Camarasaurus), as well as Allosaurus fossils.
Galton and Carpenter considered Alcovasaurus a member of the Stegosauridae, not more closely related to Kentrosaurus than to Stegosaurus. [1] However, a 2017 phylogeny of stegosaurids by Thomas Raven and Susannah Maidment found that Alcovasaurus lacked the fusion between the trochanters of the femur seen in adult eurypodans (stegosaurians and ankylosaurians), which means that it cannot be ...
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