Clade | |
Subclade |
Taxon | |
Taxon |
Thecodontia
|
Nominal Author | Owen 1859 |
2nd Nominal Author | |
Taxon Status | INACTIVE |
Comments | |
Potential Synonomy | Thecodonta (Haeckel 1866, spelling variant) |
Active Phylogenetic Definition | |
Active Definition | |
Shorthand | |
Definitional Author | |
Definition Status | Unknown |
Definition Type | Unknown |
Node-Stem Triplet | Unknown |
Other Triplet Taxa | |
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Specifier(s) C | |
Qualifiers | |
+Taxon | |
-Taxon | |
Datum | |
Taxonomic Content | |
Publication Year |
Unknown Unknown Unknown |
Inactive Taxon Status | |
Rejection Criteria |
junior synonym no definition |
Critique | No definition has been proposed for this traditional paraphyletic assemblage of basal archosaurs and closest relatives. Before the widespread use of cladistics, this taxon was used to encompass archosaurs assumed to be ancestral to dinosaurs, crocodiles, and pterosaurs. Thecodontia is included in this compilation because many authors (e.g. Romer 1956) listed it within Archosauria, even though it members included a few taxa now excluded from Archosauria. It could also be considered a potential junior synonym for Archosauria. All recent cladistic studies (e.g. Gauthier 1986) have confirmed Thecodontia as a paraphyletic taxon, the members of which are not united by any shared characteristics. Thus, this taxon name is best preserved for its historical meaning and has been abandoned, despite Gardiner’s (1982) attempt to use it within a cladistic framework. |
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