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Clade
Subclade

Taxon
Taxon
Stegosauria
Nominal Author
Marsh 1877
2nd Nominal Author
Taxon Status ACTIVE
Comments
Stegosauria was independently defined as a stem-based taxon by Galton (1997) and Sereno (1998) using textual variants of the same definition with the same genera as specifiers (Stegosaurus, Ankylosaurus). The active definition is a first-order revision of these initial definitions that uses species as specifiers (Stegosaurus stenops, Ankylosaurus magniventris).
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Stegosaurus stenops Marsh 1877 but not Ankylosaurus magniventris Brown 1908.
Shorthand
> Stegosaurus stenops but not Ankylosaurus magniventris.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Eurypoda, Ankylosauria
Specifiers
Specifier(s) A
Stegosaurus stenops
Specifier(s) B
Specifier(s) C
Ankylosaurus magniventris
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1997

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All thyreophoran ornithischians closer to Stegosaurus than to Ankylosaurus.
Latest Record
Galton 1997:701
Range (My)
Range (My)
Stegosaurus, Ankylosaurus
Range (My)

Definitional History #2
Earliest Record
All eurypods closer to Stegosaurus than to Ankylosaurus.
Latest Record
Sereno 1998:61
Range (My)
Range (My)
Stegosaurus, Ankylosaurus
Range (My)

Definitional History #3
Earliest Record
All taxa more closely related to Stegosaurus than to Ankylosauria.
Latest Record
Galton and Upchurch 2004:343
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Stegosaurus, Ankylosauria
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