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Thomas Holtz found Appalachiosaurus to be an albertosaurine in 2004, [5] but his more recent unpublished work locates it just outside Tyrannosauridae, [18] in agreement with other authors.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 .
The holotype was named as Tyrannosaurus bataar by Evgeny Maleev as Tyrannosaurus bataar. [7] The genus Tarbosaurus was also described in the same year based on PIN 551–2, a specimen with a skull and skeletal remains discovered by the same expedition in 1948 and 1949 as Tarbosaurus efremovi. [8]
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 ...
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]
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.
Some researchers found anagenesis in the group, whether contained in a daspletosaurin clade or paraphyletic in respect to the lineage of tyrannosaurines leading up to Tyrannosaurus, [3] [4] [5] but a 2023 study refuted this theory on the basis of morphological and stratigraphical data.
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