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As some analyses, like that of Carpenter from 2001 or David B. Norman in 2021 find Scelidosaurus and possibly other early forms like Emausaurus and Scutellosaurus to fall closer to Ankylosaurus than Stegosaurus, Carpenter and later Norman suggested redefining Ankylosauria to limit it to the two subclades Nodosauridae and Ankylosauridae ...
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 ...
Eurypoda (Ankylosaurus + Stegosaurus) Stegosauria (Stegosaurus > Ankylosaurus) Huayangosauridae (Huayangosaurus > Stegosaurus) Stegosauridae (Stegosaurus > Huayangosaurus) Dacentrurus armatus; Stegosaurinae (Stegosaurus > Dacentrurus) Ankylosauria (Ankylosaurus > Stegosaurus) Ankylosauridae (Ankylosaurus > Panoplosaurus) Gastonia burgei ...
Ankylosaurus [nb 1] is a genus of armored dinosaur. Its fossils have been found in geological formations dating to the very end of the Cretaceous Period, about 68–66 million years ago, in western North America, making it among the last of the non-avian dinosaurs. It was named by Barnum Brown in 1908; it is monotypic, containing only A ...
Stegosaurus longispinus was named by Charles W. Gilmore in 1914 based on a fragmentary postcranial skeleton that has largely been lost. [61] [8] It is now the type species of the genus Alcovasaurus, though it has been referred to Miragaia. [62] [61] Stegosaurus madagascariensis from Madagascar is known solely from teeth and was described by ...
The largest-known thyreophoran was Ankylosaurus at 9 m (30 ft) in length and 6 tonnes (6.6 short tons) in weight. [445] [446] Stegosaurus was also 9 m (30 ft) long [429] but around 5 tonnes (5.5 short tons) tonnes in weight. [citation needed]
A later study conducted by André Fonseca and colleagues in 2024 gave a formal definition for Thyreophoroidea in the PhyloCode as "the smallest clade containing Ankylosaurus magniventris, Scelidosaurus harrisonii, and Stegosaurus stenops". [1] The following cladogram shows the results of the phylogenetic analysis Soto-Acuña et al. (2021). [8]
Mounted skeletons of Tyrannosaurus (left) and Apatosaurus (right) at the AMNH. Dinosaurs are a diverse group of reptiles of the clade Dinosauria. 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.