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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 ...
Stegosaurus remains were first identified during the "Bone Wars" by Othniel Charles Marsh at Dinosaur Ridge National Landmark. The first known skeletons were fragmentary and the bones were scattered, and it would be many years before the true appearance of these animals, including their posture and plate arrangement, became well understood.
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.
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Stegosaurides (meaning "Stegosaurus-shaped") is a genus of herbivorous thyreophoran (perhaps ankylosaurid or possibly stegosaurian) dinosaur. It lived during the Cretaceous. Its fossils were found in the Xinminbao Group near Heishan in Gansu Province in China. These fossils consist of fragmentary material, including dermal spine elements.
To Carpenter this differential diagnosis was problematic because he considered Stegosaurus armatus, the type species of Stegosaurus, a nomen dubium and rejected Maidment's lumping of all North-American Stegosaurus material into a single species, the great variability of which making it difficult to establish any differences with Hesperosaurus.
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