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Albertosaurines are large, lightly built tyrannosaurids. Compared to tyrannosaurines, they are more slender and have shorter, flatter skulls, shorter ilia, and proportionally longer tibiae. Albertosaurines and tyrannosaurines share arms of about equal length, with the exception of Tarbosaurus, which had short arms for its size. [1]
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]
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.
One specimen of Dilong, almost fully grown, measured 1.6 meters (5.2 feet) in length, [4] and a fully grown Guanlong measured 3 meters (9.8 feet) long. [5] Teeth from Lower Cretaceous rocks (140 to 136 million years old) of Hyogo , Japan , appear to have come from an approximately 5 metres (16 ft) long animal, possibly indicating an early size ...
[19] [20] Other phylogenetic studies during the 1990s suggested that Dryptosaurus was a coelurosaur, though its exact placement within that group remained uncertain. In 1946, Charles W. Gilmore was the first to observe that certain anatomical features may link Dryptosaurus with coeval Late Cretaceous tyrannosaurids, Albertosaurus, and ...
In the first episode the survival strategies of the late-Cretaceous sauropod Sauroposeidon are contrasted with those of Tyrannosaurus rex.The primary distinction drawn is the difference between Sauroposeidon's speculated r selector method of reproduction (i.e. many offspring with no parental care) versus T. rex's proposed K selector method (i.e. few offspring with very invested parental ...
Articles related to the Tyrannosauroidea ("tyrant lizard forms"), a superfamily (or clade) of coelurosaurian theropod dinosaurs that includes the family Tyrannosauridae as well as more basal relatives.