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Clade
Subclade

Taxon
Taxon
Alvarezsauridae
Nominal Author
Bonaparte 1991
2nd Nominal Author
Taxon Status ACTIVE
Comments
The active definition is a first-order revision of the first phylogenetic definition given by Sereno (1999b). It is stem-based like the original but is not affected by any of the postulated immediate sister taxa--including avians. Shuvuuia deserti was chosen as the internal specifier because it is well known and nested among alvarezsaurid. By comparison, the eponymous species Alvarezsaurus calvoi (Chiappe et al. 2002) is poorly known although clearly related. This nominotypical species could be included as a positive taxon qualifier, although the definition is presented without its inclusion here because of its clear relationship with Shuvuuia.
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Shuvuuia deserti Chiappe et al. 1998 but not Ornithomimus edmontonicus Sternberg 1933, Tyrannosaurus rex Osborn 1905, Therizinosaurus cheloniformis Maleev 1954, Oviraptor philoceratops Osborn 1924, Troodon formosus Leidy 1856, Passer domesticus (Linnaeus 1758).
Shorthand
> Shuvuuia deserti but not Ornithomimus edmontonicus, Tyrannosaurus rex, Therizinosaurus cheloniformis, Oviraptor philoceratops, Troodon formosus, Passer dome
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Shuvuuia deserti
Specifier(s) B
Specifier(s) C
Ornithomimus edmontonicus, Tyrannosaurus rex, Therizinosaurus cheloniformis, Oviraptor philocer
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1999

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All ornithomimosaurs closer to Shuvuuia than to Ornithomimus.
Latest Record
Sereno 1999b:2147
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Shuvuuia, Ornithomimus
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