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Clade
Subclade
Archosauria: Avemetatarsalia to Neornithes
Taxon
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Taxon
Albertosaurinae
Nominal Author
Currie et al. 2003
2° Nominal Author
Taxon Status
active
inactive
Comments
Albertosaurinae was first named and defined by Currie et al. (2003). The active defnition is a first-order revision that uses species as specifiers.
Potential Synonomy
Active Phylogenetic Definition
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Active Definition
The most inclusive taxon containing
Albertosaurus
sarcophagus
Osborn 1905 but not
Tyrannosaurus
rex
Osborn 1905.
Shorthand
>
Albertosaurus
sarcophagus
but not
Tyrannosaurus
rex
.
Definitional Author
Sereno 2005
Definition Status
original
textual substitution
first-order revision
second-order revision
Definition Type
node
stem
Node-Stem Triplet
yes
no
Other Triplet Taxa
Tyrannosauridae, Tyrannosaurrinae
Specifiers
Specifier A
Albertosaurus
sarcophagus
Specifier(s) B
Specifier(s) C
Tyrannosaurus
rex
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year
2003
Inactive Taxon Status
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Rejection Criteria
junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
other
Critique
Current Age Range
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Earliest Record
Campanian (84 Ma)
Latest Record
Maastricchtian (66 Ma)
Range (My)
18
Basis for Range
The oldest record is the albertosaurine
Gorgosaurus
libratus
from the midddle-to-late Campanian and the youngest is
Albertosaurus
sarcophagus
from the late Maastrichtian (Holtz 2004). Dates are rounded to the nearest million, the earliest from the beginning of the stage and the latest from the end of the stage (Gradstein et al. 2004).
Definitional History #1
Definition 1
All tyrannosaurids closer to
Albertosaurus
than
Tyrannosaurus
.
Author
Currie et al. 2003:230
Type
node
stem
Specifiers
Albertosaurus
,
Tyrannosaurus
Qualifiers
Definitional History #2
Definition 2
A. sarcophagus
and all taxa sharing a more recent common ancestor with it than with
T. rex
.
Author
Holtz 2004:127
Type
node
stem
Specifiers
A. sarcophagus
,
Tyrannosaurus
rex
Qualifiers
