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Clade
Subclade

Taxon
Taxon
Tyrannosaurinae
Nominal Author
Osborn 1906
2nd Nominal Author
Matthew and Brown 1922
Taxon Status ACTIVE
Comments

Sereno (1998) was first to define Tyrannosaurinae as a stem-based taxon and has been followed in this regard by later authors (Holtz 2001, Currie et al. 2003, Holtz et al. 2004). The object is to define a clade of tyrannosaurids that are most closely related to Tyrannosaurus rex. Sereno (1998) used Daspletosaurus in addition to Gorgosaurus and Albertosaurus as external specifiers; Holtz (2001, 2004) used Aublysodon and then Albertosaurus; Currie et al. (2003) used Albertosaurus.

It seems most useful to exclude both Albertosaurus sarcophagus and Gorgosaurus libratus, as these two among tyrannosaurids are clearly not the closest relatives of Tyrannosaurus rex. The active definition, thus, is a first-order revision of the definition proposed by Currie et al. (2003) and Holtz (2004:127).

Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Tyrannosaurus rex Osborn 1905 but not Gorgosaurus libratus Lambe 1914, Albertosaurus sarcophagus Osborn 1905.
Shorthand
> Tyrannosaurus rex but not Gorgosaurus libratus, Albertosaurus sarcophagus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Tyrannosauridae, Albertosaurinae
Specifiers
Specifier(s) A
Tyrannosaurus rex
Specifier(s) B
Specifier(s) C
Gorgosaurus libratus, Albertosaurus sarcophagus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
2003

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All tyrannosaurids closer to Tyrannosaurus than to either Albertosaurus, Daspletosaurus, or Gorgosaurus.
Latest Record
Sereno 1998:65
Range (My)
Range (My)
Tyrannosaurus, Albertosaurus, Daspletosaurus, Gorgosaurus
Range (My)

Definitional History #2
Earliest Record
Tyrannosaurus and all taxa sharing a more recent common ancestor with it than with Aublysodon.
Latest Record
Holtz 2001:66
Range (My)
Range (My)
Tyrannosaurus, Aublysodon
Range (My)

Definitional History #3
Earliest Record
All taxa closer to Tyrannosaurus than Albertosaurus.
Latest Record
Currie et al. 2003:230
Range (My)
Range (My)
Tyrannosaurus, Albertosaurus
Range (My)

Definitional History #4
Earliest Record
Tyrannosaurus rex and all taxa sharing a more recent common ancestor with it than with Albertosaurus sarcophagus.
Latest Record
Holtz 2004:127
Range (My)
Range (My)
Tyrannosaurus rex, Albertosaurus sarcophagus
Range (My)

Definitional History #5
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Definitional History #6
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Definitional History #7
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Definitional History #8
Earliest Record
Latest Record
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Definitional History #9
Earliest Record
Latest Record
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Definitional History #10
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