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Tarbosaurus-like articulations between the skull bones are also seen in Alioramus from Mongolia, suggesting that it is the closest relative of Tarbosaurus. Similarities between Tarbosaurus and Tyrannosaurus might be related to their large size, independently developed through convergent evolution. [2]
Tarbosaurus and Alioramus shared several skull features, including a locking mechanism in the lower jaw between the dentary and angular bones, and both lacked the prong of the nasal bones which connected to the lacrimal bones in all other tyrannosaurids except adult Daspletosaurus. The two genera may be closely related, representing an Asian ...
The nuchal crest was especially well-developed in Tyrannosaurus, Tarbosaurus and Alioramus. Albertosaurus, Daspletosaurus and Gorgosaurus had tall crests in front of the eyes on the lacrimal bones, while Tarbosaurus and Tyrannosaurus had extremely thickened postorbital bones forming crescent-shaped crests behind the eyes.
These genera, however are controversial as the remains of these animals are immature or juvenile individuals. With the possible exception of Raptorex, [17] it is widely assumed that the Asian specimens are early growth stages of Tarbosaurus, [18] [19] [20] whereas the North American specimens are those of Tyrannosaurus. [21] [22]
Towards the sides of the smooth surface is ventrolateral portion of the lacrimal suture that forms a rostrally facing cup-like structure that is as rostrally concave and ventrolaterally convex, as in Lythronax, Daspletosaurus, Tyrannosaurus, Tarbosaurus, and Nanuqsaurus. [1] Frontals in ventral view.
Therizinosaurus was a very tall animal, likely having a reduced competition over the foliage in its habitat and outmatching predators like tyrannosaurid Tarbosaurus. History of discovery [ edit ]
Torvosaurus (/ ˌ t ɔːr v oʊ ˈ s ɔːr ə s /) is a genus of large megalosaurine theropod dinosaur that lived approximately 165 to 148 million years ago during the Callovian to Tithonian ages of the late Middle and Late Jurassic period in what is now Colorado, Portugal, Germany, and possibly England, Spain, Tanzania, and Uruguay.
Its taxonomy is also controversial, as some scientists consider Tarbosaurus bataar from Asia to be a third Tyrannosaurus species, while others maintain Tarbosaurus is a separate genus. Several other genera of North American tyrannosaurids have also been synonymized with Tyrannosaurus.
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