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 |
Range (My) | |
Range (My) |
Thyreophora, Cerapoda |
Range (My) |
Definitional History #2 | |
Earliest Record | Ankylosaurus, Triceratops, their most recent common ancestor and all descendants. |
Latest Record | Sereno 1998:61 |
Range (My) | |
Range (My) |
Ankylosaurus, Triceratops |
Range (My) |
Definitional History #3 | |
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Definitional History #4 | |
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Definitional History #5 | |
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Definitional History #6 | |
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Definitional History #7 | |
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Definitional History #8 | |
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Definitional History #9 | |
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Definitional History #10 | |
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