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Thomas Holtz found Appalachiosaurus to be an albertosaurine in 2004, [5] but his more recent unpublished work locates it just outside Tyrannosauridae, [18] in agreement with other authors. [19] The other major subfamily of tyrannosaurids is the Tyrannosauridae , including genera such as Daspletosaurus , Tarbosaurus , and Tyrannosaurus .
Like albertosaurines, tyrannosaurines also had heterodont dentition, large heads design to catch and kill their prey, and short didactyl arms. Based on the growth stages of Tyrannosaurus (and possibly Tarbosaurus [20]), tyrannosaurines undergone ontogenetic changes from gracile or slender, semi-longirostrine immatures to robust, heavy-headed ...
Albertosaurus was a fairly large bipedal predator, but smaller than Tarbosaurus and Tyrannosaurus rex. Typical Albertosaurus adults measured up to 8–9 m (26–30 ft) long [19] [20] [3] and weighed between 1.7 and 3.0 metric tons (1.9 and 3.3 short tons) in body mass. [32] [3] [33] [2]
Daspletosaurus (/ d æ s ˌ p l iː t ə ˈ s ɔːr ə s / das-PLEET-ə-SOR-əs; meaning "frightful lizard") is a genus of tyrannosaurid dinosaur that lived in Laramidia between about 78 and 74.4 million years ago, during the Late Cretaceous Period.
Tyrannosaurus was named by Henry Fairfield Osborn in 1905, along with the family Tyrannosauridae. [17] The name is derived from the Ancient Greek words τυραννος tyrannos ('tyrant') and σαυρος sauros ('lizard'). The superfamily name Tyrannosauroidea was first published in a 1964 paper by the British paleontologist Alick Walker. [18]
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English: Size comparison of the two members of Albertosaurinae: Albertosaurus and Gorgosaurus. The silhouettes are proportionately based on skeletals by randomdinos: [1] & [2] . Human silhouette from File:Silhouette of man standing and facing forward.svg (CC0).
The Tyrannosaurus rex steps on a twig, which makes the Monoclonius wary. The Monoclonius lets out a trumpet to signal the herd, then keeps walking deeper into the forest. It soon stumbles upon the remains of the Edmontosaurus killed by the Tyrannosaurus rex. While the Monoclonius ponders over the carcass, the Tyrannosaurus rex sneaks up from ...