ammonites
banner
Gateway to the Paleobiology Database
Tyrannosaurus rex Osborn 1905 (tyrant lizard king)

Reptilia - Avetheropoda - Tyrannosauridae

PaleoDB taxon number: 54833

Alternative combination: Tyranosaurus rex

Synonyms: Albertosaurus megagracilis Paul 1988 (no. 67649), Aublysodon molnari Paul 1988 (no. 99205), Aublysodon molnaris Paul 1988 (no. 57107), Dinotyrannus megagracilis Paul 1988 (no. 67650), Dynamosaurus imperiosus Osborn 1905 (no. 56318), Manospondylus gigas Cope 1892 (no. 63935), Stygivenator molnari Paul 1988 (no. 92291), Tyrannosaurus imperiosus Osborn 1905 (no. 77215)

Full reference: H. F. Osborn. 1905. Tyrannosaurus and other Cretaceous carnivorous dinosaurs. Bulletin of the American Museum of Natural History 21(14):259-265

Belongs to Tyrannosaurus according to T. R. Holtz 2004

Sister taxa: Tyrannosauripus, Tyrannosaurus turpanensis

Type specimens:

  • Tyrannosaurus rex: NMC 9380 =AMNH 973, a partial skeleton (scapula). Its type locality is Sheba Mountain, Sieber Ranch (AMNH), which is in a Maastrichtian terrestrial sandstone in the Lance Formation of Montana.
  • Albertosaurus megagracilis: LACM 28345. Its type locality is Engdahl Ranch (LACM), which is in a Maastrichtian terrestrial horizon in the Hell Creek Formation of Montana.
  • Aublysodon molnaris: LACM 28471. Its type locality is LACM 7245, Engdahl Ranch, which is in a Maastrichtian terrestrial claystone in the Hell Creek Formation of Montana.
  • Dynamosaurus imperiosus: AMNH 5866. Its type locality is Seven Mile Creek (AMNH), which is in a Maastrichtian terrestrial claystone/siltstone in the Lance Formation of Wyoming.
  • Manospondylus gigas: AMNH 3982.

Ecology: ground dwelling carnivore

Average measurements (in mm): femur 1291.2 x 180.0, femur circumference 518.1, fibula 1056.3 x 105.0, fibula circumference 150.5, humerus 372.3 x 56.0, radius 173.0 x 27.0, scapula length 950.0, scapulacoracoid width 136.5, skull 1374.1 x 945.0, tibia 1158.8 x 165.0, tibia circumference 451.2, ulna length 167.4

Estimated body mass: 3.97 tons based on femur length