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Clade
Subclade

Taxon
Taxon
Hesperornithidae
Nominal Author
Marsh 1872
2nd Nominal Author
Taxon Status ACTIVE
Comments
Hesperornithidae (originally spelled Hesperornidae, Marsh 1872:4) was defined by Clarke (2004:18) as a stem-based taxon that includes the type species Hesperornis regalis and other species more closely related to H. regalis than to Baptornis advenus. This follows Martin (1983, 1984), who recognized a second genus (Parahesperornis) most closely related to Hesperornis. This is somewhat arbitrary, as Martin might well have just recognized another species of Hesperornis. Previously Hesperornithidae has been redundant with the genus Hesperornis.
Potential Synonomy
Hesperornidae (Marsh 1872, spelling variant), Hesperornithiformes, Hesperornithinae

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Hesperonris regalis Marsh 1872 but not Baptornis advenus Marsh 1877.
Shorthand
> Hesperonris regalis but not Baptornis advenus.
Definitional Author
Clarke 2004
Definition Status TEXTUAL SUBSTITUTION
Definition Type STEM
Node-Stem Triplet NO
Other Triplet Taxa
Specifiers
Specifier(s) A
Hesperonris regalis
Specifier(s) B
Specifier(s) C
Baptornis advenus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
2004

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
All taxa more closely related to Hesperornis regalis (Marsh 1872a) than to Baptornis advenus (Marsh 1877a).
Latest Record
Clarke 2004:18
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Hesperornis regalis, Baptornis advenus
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