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Clade
Subclade

Taxon
Taxon
Genasauria
Nominal Author
Sereno 1986
2nd Nominal Author
Taxon Status ACTIVE
Comments

Genasauria was originally defined by Currie and Padian (1997) as a node-based taxon using Thyreophora and Cerapoda as specifiers. Independently, Sereno (1998) provided a first-order alternative using nested genera within each of the clades cited by Currie and Padian (1997). Genasauria was originally coined by Sereno (1986) to include all ornithischians but the most basal stem taxa, such as Lesothosaurus diagnosticus. The early fossil record of ornithischians, however, remains patchy, and some nodes are supported by only a few synapomorphies (Sereno, 1999b).

To ensure the integrity of Genasauria as originally conceived, one nested ornithopod is added to the definition as an internal specifier. Note that this definition does not depend on the placement of the basal ornithischian Lesothosaurus diagnosticus, which has been placed in an alternative position recently by Butler (2005).

Potential Synonomy

Active Phylogenetic Definition
Active Definition
The least inclusive clade containing Ankylosaurus magniventris Brown 1908 and Triceratops horridus Marsh 1889, Parasaurolophus walkeri Parks 1922.
Shorthand
< Ankylosaurus magniventris and Triceratops horridus, Parasaurolophus walkeri.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type NODE
Node-Stem Triplet NODE
Other Triplet Taxa
Thyreophorra, Neornithischia
Specifiers
Specifier(s) A
Ankylosaurus magniventris
Specifier(s) B
Triceratops horridus, Parasaurolophus walkeri
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1997

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
Thyreophora and Cerapoda and all descendants of their common ancestor.
Latest Record
Currie and Padian 1997:271
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Thyreophora, Cerapoda
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Definitional History #2
Earliest Record
Ankylosaurus, Triceratops, their most recent common ancestor and all descendants.
Latest Record
Sereno 1998:61
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Ankylosaurus, Triceratops
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