Clade | |
Subclade |
Taxon | |
Taxon |
Allosauridae
|
Nominal Author | Marsh 1878 |
2nd Nominal Author | |
Taxon Status | ACTIVE |
Comments | Padian and Hutchinson (1997) provided a stem-based definition for Allosauridae, using Allosaurus and Sinraptor as specifiers, although mentioning that relationships among the various genera composing Allosauroidea was uncertain. To better contain this uncertainty, Sereno (1998) provided a first-order revision that included several other allosauroid genera as external specifiers that help to limit potential membership. Sereno (1998) did the same for two other clades within Allosauroidea (Sinraptoridae, Carcharodontosauridae) that are most often used in the literature. Padian et al. (1999) and Holtz (2000) did not cite this revision and repeated their earlier definition. The active definition takes a middle road. Clearly, if relationships among the genera are as uncertain as Padian et al. (1999) described, then it would be better to exclude at least the specifying species of the two other allosauroid subclades (Sinraptor dongi, Carcharodontosaurus saharicus), leaving other species to fall where they will. In a recent summary (Holtz et al. 2004), the family (which is not defined) is shown as including only two genera (Allosaurus, Saurophaganax), but the relationships among several others within Allosauroidea (Carnosauria) is uncertain. To eliminate the possibility that coelurosaurians would be included (in the event that any of these specifiers is closer to Coelurosauria than to themselves—i.e., if Allosauroidea is not monophyletic), one additional external specifier is used (Passer domesticus). This is a first-order revision of the definition originally given by Padian et al. (1997). |
Potential Synonomy |
Active Phylogenetic Definition | |
Active Definition |
The most inclusive clade containing Allosaurus fragilis Marsh 1877 but not Sinraptor dongi Currie and Zhao 1993, Carcharodontosaurus saharicus (Depéret and Savornin 1927), Passer domesticus (Linnaeus 1758).
|
Shorthand |
> Allosaurus fragilis but not Sinraptor dongi, Carcharodontosaurus saharicus, Passer domesticus. |
Definitional Author |
Sereno 2005 |
Definition Status | checked |
Definition Type | STEM |
Node-Stem Triplet | NO |
Other Triplet Taxa | |
Specifiers | |
Specifier(s) A |
Allosaurus fragilis |
Specifier(s) B | |
Specifier(s) C |
Sinraptor dongi, Carcharodontosaurus saharicus, Passer domesticus
|
Qualifiers | |
+Taxon | |
-Taxon | |
Datum | |
Taxonomic Content | |
Publication Year |
Unknown Unknown Unknown 1997 |
Inactive Taxon Status | |
Rejection Criteria | |
Critique | |
Definitional History #1 | |
Earliest Record | Allosaurus and all Allosauroidea closer to it than to Sinraptor. |
Latest Record | Padian and Hutchinson 1997:7 |
Range (My) | |
Range (My) |
Allosaurus, Sinraptor |
Range (My) |
Definitional History #2 | |
Earliest Record | All allosauroids closer to Allosaurus than to either Sinraptor, Monolophosaurus, Cryolophosaurus, or Carcharodontosaurus. |
Latest Record | Sereno 1998:64 |
Range (My) | |
Range (My) |
Allosaurus, Sinraptor, Monolophosaurus, Cryolophosaurus, Carcharodontosaurus |
Range (My) |
Definitional History #3 | |
Earliest Record | Allosaurus fragilis and all taxa sharing a more recent common ancestor with it than with Sinraptor dongi or Carcharodontosaurus saharicus. |
Latest Record | Holtz et al. 2004:102 |
Range (My) | |
Range (My) |
Allosaurus fragilis, Sinraptor dongi, Carcharodontosaurus saharicus |
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Definitional History #10 | |
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