Temporal range: Late Cretaceous
|An artist's illustration of Tarbosaurus bataar|
Olshevsky & Ford, 1995
| †Tarbosaurus bataar|
Maleev, 1955 [originally Tyrannosaurus]
Tarbosaurus bataar (tar-bo-SORE-us) (Greek, "alarming lizard") was a member of the dinosaur family of tyrannosaurids, which flourished during the Late Cretaceous Period, 70 million years ago. In the past some paleontologists considered it a species of Tyrannosaurus, but evidence suggests that Tarbosaurus is too distinct from Tyrannosaurus for that to be the case. It would have coexisted with another, much smaller tyrannosaurid, the alioramin Alioramus.
PaleobiologyAlthough many specimens of this genus has been found, little definite data is confirmed on the dinosaur as of 1986, though it Lythronax further cements this relationship, as it shows Tarbosaurus is most closely related to Tyrannosaurus, and Zhuchengtyrannus while Lythronax stands as the sister taxon to this clade.
Only one species of Tarbosaurus, T. bataar, has been officially established. Tarbosaurus is very well-represented in the fossil record, known from dozens of specimens, including several complete skulls and skeletons. These remains have allowed scientific studies focusing on its phylogeny, skull mechanics, and brain structure. Although smaller than Tyrannosaurus, Tarbosaurus was one of the largest tyrannosaurids. The largest known individuals were about 12 meters (39 feet) long. The mass of a fully grown individual has never been published, although it is estimated to have been slightly smaller than the average Tyrannosaurus. Tarbosaurus is unique among Tyrannosaurids in that it possesses a locking mechanism in its jaws; possibly an adaptation for hunting sauropods. This locking mechanism also made the theropod's skull more rigid as a result.
While juvenile tyrannosaurids in general are rare, a skeleton of a very young Tarbosaurus (estimated to be two or three years of age) indicates they had very different niches from the adults and may have been nocturnal, based on measurements of their sclerotic rings. Whether the adults were nocturnal as well is not known.
Skin impressions are known from Tarbosaurus, and show the animal had non-overlapping scales. However, fossil poachers destroyed the impressions, and as such they can no longer be studied. Footprints attributed to the genus are also known from the Nemegt Formation.
Tarbosaurus fossils have been found primarily in the Nemegt Formation of Mongolia, and are believed to be early Maastrichtian in age (circa 70 mya). At the time, Mongolia was a seasonal floodplain on the edge of a desert that was prone to long dry seasons and short wet seasons. The resulting environment may have looked similar to the modern Okavango Delta of Africa. Regardless, it was an environment capable of supporting a wide array of large dinosaur species.
Tarbosaurus would have shared the Nemegt with many genera and species of animals. While Tarbosaurus was at the top of the food chain, it also shared its environment with other predators, such as the smaller Alioramus altai, another tyrannosauroid belonging to the Alioramini, the dromaeosaurid Adasaurus, and troodontids such as Borogovia, Tochisaurus, and Zanabazar, oviraptorosaurs Elmisaurus, Nemegtomaia, Rinchenia or Bagaraatan, (which may actually be a basal tyrannosauroid rather than an oviraptorosaur). Other theropods, like the gigantic Therizinosaurus, and ornithomimosaurs such as Anserimimus, Gallimimus, and gigantic Deinocheirus dwelled here as well. Other dinosaurs of note that resided in the Nemegt included Saurolophus (also native to North America), ankylosaurids such as Tarchia and Saichania, the pachycephalosaurid Prenocephale, and the titanosaurid Nemegtosaurus (which may or may not be synonymous with Opisthocoelicaudia). All would have been potential prey for adult Tarbosaurus, while adolescent Tarbosaurus may have been forced to compete with Alioramus for food due to occupations of a similar niche.
In the Media
Tarbosaurus was featured in the Walking with Dinosaurs special, Chased by Dinosaurs, where it chased Nigel Marven around at the beginning, and then it met a Therizinosaurus and fought with it until it was slashed by the therizinosaur's claws and backed off. Tarbosaurus has also featured in the movie "The Dino King" (Referred to in some media as "Speckles the Tarbosaurus", Dinosaurs Alive, The Truth About Killer Dinosaurs, and a South Korean series called Tarbosaurus the Mightiest Ever. It also featured in an episode of Animal Armageddon. Tarbosaurus is one of the playable Vivosaurs in Fossil Fighters series. Tarbosaurus will be featured in the game Jurassic World: Alive.
- The Tarbosaurus of Chased By Dinosaurs was smaller than the Therizinosaurus and is also lacking feathers, both of which are not true.
- Tarbosaurus in Fossil Fighters is inaccurately portrayed with a sail, which it does not have in real life and it's also lacking feathers.