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A 1999 study subsequently reclassified Maleevosaurus as a juvenile Tarbosaurus. [10] All research published since 1999 recognizes only a single species, which is either called Tarbosaurus bataar [11] [12] [13] or Tyrannosaurus bataar. [14]
In 2007, it was found that the group also contained Maleevosaurus, often synonymized with Tarbosaurus. [15] However, this classification has not been accepted and Maleevosaurus is still considered a juvenile Tarbosaurus or Tyrannosaurus. [16] This classification has not been accepted. [2] [3]
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]
The long and low shape of the only known Alioramus remotus skull indicated that it was immature when it died and might even have been a juvenile Tarbosaurus, which lived in the same time and place. The more prominent nasal crests and much higher tooth count of Alioramus , however, suggested it was a separate taxon, even if it is known only from ...
An additional tyrannosaurid, Raptorex, was initially described as a more primitive tyrannosauroid, but likely represents a juvenile tyrannosaurine similar to Tarbosaurus. However, as it is known only from a juvenile specimen, it is also currently considered a nomen dubium . [ 37 ]
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The juvenile Tarbosaurus have a skull about 28 cm. long, and the lower jaw of IVPP V4878 measure about 25-26 cm (, IVPP V4878 is C. in the image. References ↑ Tsuihiji T et.al. (2011), "Cranial Osteology of a Juvenile Specimen of Tarbosaurus bataar (Theropoda, Tyrannosauridae) from the Nemegt Formation (Upper Cretaceous) of Bugin Tsav ...
Tarbosaurus (meaning 'terrifying lizard') is a genus of tyrannosaurid theropod dinosaur that flourished in Asia between 70 and 65 million years ago, near the end of the Late Cretaceous Period. Fossils have been recovered in Mongolia with more fragmentary remains found further afield in parts of China .