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Tyrannosaurids, like their tyrannosauroid ancestors, were heterodonts, with premaxillary teeth D-shaped in cross section and smaller than the rest. Unlike earlier tyrannosauroids and most other theropods, the maxillary and mandibular teeth of mature tyrannosaurids are not blade-like but extremely thickened and often circular in cross-section ...
Comparison of the teeth of Daspletosaurus and American alligators shows that the enamel of tyrannosaurids had no significant wear and that the teeth of modern crocodilians were eroded on the labial side and were substantially worn. This suggests that it is likely that theropod teeth were kept wet by lips.
The premaxillary teeth at the front of the upper jaw are shaped differently from the rest of the teeth, smaller in size and with a D-shaped cross section. In the lower jaw , a prominent ridge on the surangular bone extends sideways from just below the jaw joint, except in the basal Guanlong .
Deinodon teeth, the earliest known tyrannosaurid remains. The first remains of tyrannosaurids were uncovered during expeditions led by the Geological Survey of Canada, which located numerous scattered teeth. These distinctive dinosaur teeth were given the name Deinodon ("terrible tooth") by Joseph Leidy in 1856.
Like most known tyrannosaurids, Gorgosaurus was a large bipedal predator, measuring 8–9 metres (26–30 ft) in length and 2–3 metric tons (2.2–3.3 short tons) in body mass. Dozens of large, sharp teeth lined its jaws, while its two-fingered forelimbs were comparatively small.
Other tyrannosaurids had four premaxillary teeth, D-shaped in cross section, on each side. Including 16 or 17 in each maxilla, and 18 in each dentary, Alioramus had 76 or 78 teeth, more than any other tyrannosaurid. [10] The braincase of A. altai was intermediate between the basal theropod and avialan conditions. [11] [8]
We all know the King of the Dinosaurs, but a new study suggests the Tyrannosaurus rex as we know it might actually be three distinct species. The post Tyrannosaurus Rex May Actually Be Three ...
Phylogenetic analysis of Tyrannosauridae finds Nanuqsaurus to be a close relative of Daspletosaurus and Tyrannosaurus within Tyrannosaurinae. Below is a cladogram illustrating the relationships of the Tyrannosauridae: [11] CT slice through the partial left dentary bone of the holotype, showing the replacement teeth present in the jaw bone