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Clade
Subclade
Archosauria: Avemetatarsalia to Neornithes
Taxon
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Taxon
Alexornithidae
Nominal Author
Brodkorb 1978
2° Nominal Author
Taxon Status
active
inactive
Comments
Potential Synonomy
Active Phylogenetic Definition
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Active Definition
Shorthand
Definitional Author
Definition Status
original
textual substitution
first-order revision
second-order revision
Definition Type
node
stem
Node-Stem Triplet
yes
no
Other Triplet Taxa
Specifiers
Specifier A
Specifier(s) B
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year
Inactive Taxon Status
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Rejection Criteria
junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
other
Critique
No definition has been proposed. Although the family has recently been shown including eight genera (Kurochkin 1996), there is no cladistic support for such a clade (Sereno et al. 2002).
Current Age Range
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Earliest Record
Latest Record
Range (My)
Basis for Range
Additional Definitional History:
None Available
