Albertosaurus sarcophagus Osborn 1905

Carpenter, K., 1992, Tyrannosaurids (Dinosauria) of Asia and North America, Aspects of Nonmarine Cretaceous Geology, Beijing: China Ocean Press, pp. 250-268 : 257-258

Albertosaurus sarcophagus Osborn 1905

Figs. 2 D , 5 D

= Laelaps incrassatus Cope 1892

= Dryptosaurus incrassatus ( Cope) 1892

= Albertosaurus arctunguis Parks 1928

Holotype: NMC 5600 nearly complete skull from the Horseshoe Canyon Formation, Alberta, Canada .

Diagnosis: (Cranial) premaxilla anteroposteriorly very short and broad so that littie of it is visible in lateral view; pro-maxillary fenestra set well in advance of maxillary fenestra,and visible in lateral'view;maxillary fenestra taller than long,and separated from antorbital fenestra by a thin bar of the maxillary; lacrymal horn moderately developed;surangular foramen small for tyrannosaurid. (Postcranial) Body appears to be shorter than in A. libratus ; distal end of scapular blade strongly inflected forward; tibia more gracile than in A. libratus .

Stratigraphic and Palaeobiogeographic Distribution: Horseshoe Canyon Formation, Alberta, Canada.

Figures

Figure 2. Comparison of tyrannosaurid skulls: A-Tyrannosaurus rex AMNH 5027 (modified from Osborn, 1912); B-Tyrannosaurus bataar holotype PIN 551-1, with missing areas restored after PIN 551-3 and GI SPS 100/59 (from photographs,Maleev, 1974 and Barsbold,1983);C-Maleevosaurus novojilovi holotype PIN 552-2 (modified from Maleev, 1974);D-Albertosaurus sarcophagus AMNH 5222, with lower jaws based on NMC 5600 and NMC 5601 (modified from photographs and Lambe, 1904);E-Albertosaurus libratus(modified from Russell, 1970); F-? Albertosaurus lancensis holotype CMNH 7541, composite of the left and right side (modified from photographs);G-Daspletosaurus torosus(modified from Russell, 1970 and photographs of NMC 8506). All drawn to scale;scale beneath Tyrannosaurus rex = 10 cm .

Figure 5. Comparison of tyrannosaurid skeletons: A-Tyrannosaurus rex(based on drawings and photographs of AMNH 5027 and CM 9380);B-Tyrannosaurus bataar (based on photographs of PIN 552-1,a young adult);C- Maleevosaurus novojilovi (modified from Maleev, 1974);D-Albertosaurus sarcophagus (skeleton based on photographs and drawings of ROM 807,with the skull based on photographs and drawings of AMNH 5222,NMC 5600 and NMC 5601); E- Albertosaurus libratus (skeleton modified from Lambe, 1914,and skull modified from Russell, 1970);F-Daspletosaurus torosus (modified from Russell, 1970). All drawn to scale;height of scale beneath Tyrannosaurus rex tail = 1 m .