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Type specimen of Dynamosaurus imperiosus, London. The holotype of Tyrannosaurus rex, a partial skull and skeleton originally called AMNH 973 (AMNH stands for American Museum of Natural History), was discovered in the U.S. state of Montana in 1902 and excavated over the next three years.
Initially, Osborn considered these to be distinct species. The first, he named Dynamosaurus imperiosus ("emperor power lizard"), and the second, Tyrannosaurus rex ("king tyrant lizard"). A year later, Osborn recognized that these two specimens actually came from the same species.
Dynamosaurus imperiosus holotype (NHMUK PV R8020, previously AMNH 5886) on display at the Natural History Museum. Osborn named the other specimen Dynamosaurus imperiosus in a paper in 1905. [6] In 1906, Osborn recognized that the two skeletons were from the same species and selected Tyrannosaurus as the preferred name. [8]
Skeletal mount of the Tyrannosaurus holotype.. This timeline of tyrannosaur research is a chronological listing of events in the history of paleontology focused on the tyrannosaurs, a group of predatory theropod dinosaurs that began as small, long-armed bird-like creatures with elaborate cranial ornamentation but achieved apex predator status during the Late Cretaceous as their arms shrank and ...
The binomial name honours “Dynamosaurus imperiosus”, a junior synonym of Tyrannosaurus, as it had been a "childhood favourite" of one of the authors. [1]
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.
The mounted Titus skeleton measures 4 metres (13 ft) high and 11 metres (36 ft) long. [2] It is named after the protagonist in Shakespeare's Titus Andronicus. [5] The skeleton comprises 59 preserved elements, representing about 20% of the bones in an adult T. rex. [6]
Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hind limbs, the forelimbs