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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 ...
Daniel Madzia and colleagues in 2021 formally defined Ankylosauridae in the PhyloCode as "the largest clade containing Ankylosaurus magniventris, but not Nodosaurus textilis". [13] The basal subfamily Shamosaurinae is formally defined as "the largest clade containing Gobisaurus domoculus and Shamosaurus scutatus, but not Ankylosaurus ...
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]
Artistic skeletal reconstruction of Ankylosaurus (AMNH 5895) by Barnum Brown, 1908, before the tail club was known Artistic restoration of Ankylosaurus magniventris. 1901. F. A. Lucas described the new species Stegosaurus marshi, and later reclassified it as Polacanthus marshi. [12] 1902
Ankylosaurinae is formally defined in the PhyloCode as "the largest clade containing Ankylosaurus magniventris, but not Shamosaurus scutatus". [2] [3] [4] The tribe Ankylosaurini is defined in the PhyloCode as "the largest clade containing Ankylosaurus magniventris, but not Pinacosaurus grangeri and Saichania chulsanensis".
This definition was further refined by Paul Sereno in 2005 to specify Ankylosaurus magniventris and Stegosaurus stenops, the type species of both genera, a definition that was followed by Madzia and colleagues in 2021 when the group name and definition was formalized following the PhyloCode. [5]
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†Ankylosaurus †Ankylosaurus magniventris; 68.5–66 Ma Hell Creek Formation, Montana, USA An ankylosaurine ankylosaurid. The largest-known ankylosaur, estimated at 9 m (30 ft) and up to 6 tonnes (13,000 lb). Ankylosaurus Antarctopelta Edmontonia longiceps Tarchia †Anodontosaurus †Anodontosaurus lambei; 72.8–67 Ma, Campanian to ...