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Clade
Subclade

Taxon
Taxon
Spinosauridae
Nominal Author
Stromer 1915
2nd Nominal Author
Taxon Status ACTIVE
Comments
Sereno (1998) provided the first definition. The active definition uses species as specifiers and includes two additional external specifiers (Allosaurus fragilis, Passer domesticus) to ensure stability in taxonomic content, should spinosaurids prove to have closer relationships with other basal theropods.
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Spinosaurus aegyptiacus Stromer 1915 but not Torvosaurus tanneri Galton and Jensen 1979, Allosaurus fragilis Marsh 1877, Passer domesticus (Linnaeus 1758).
Shorthand
> Spinosaurus aegyptiacus but not Torvosaurus tanneri, Allosaurus fragilis, Passer domesticus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Spinosauroidea, Torvosauridae
Specifiers
Specifier(s) A
Spinosaurus aegyptiacus
Specifier(s) B
Specifier(s) C
Torvosaurus tanneri, Allosaurus fragilis, Passer domesticus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All spinosauroids closer to Spinosaurus than to Torvosaurus.
Latest Record
Sereno 1998:64
Range (My)
Range (My)
Spinosaurus,Torvosaurus
Range (My)

Definitional History #2
Earliest Record
Spinosaurus aegyptiacus and all taxa sharing a more recent common ancestor with it than with Passer domesticus.
Latest Record
Holtz et al. 2004:97
Range (My)
Range (My)
Spinosaurus aegyptiacus, Passer domesticus
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Definitional History #10
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