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Clade
Subclade

Taxon
Taxon
Diplodocoidea
Nominal Author
Marsh 1884
2nd Nominal Author
Upchurch 1995
Taxon Status ACTIVE
Comments

Upchurch (1995) was first to use the superfamily. He included Quaesitosaurus and Nemegtosaurus (see also Upchurch 1998, 1999; Upchurch et al. 2004); the definition later employed followed that of the initial definition (Sereno 1998:63). The two aforementioned genera are likely synonyms and more likely represent a titanosaurian (Wilson 2002, in press). They are not used in the active definition and are regarded as lying outside Diplodocoidea.

Recently Taylor and Naisch (2005:2-3) discussed in detail the history of the taxon Diplodocoidea and also used the defnition of Sereno (1998).  The active definition is a first-order revision of Sereno (1998:63) that uses species instead of genera. Wilson and Sereno (1998) used a very similar definition but list two other genera (Rayososaurus, Amphicoelias). These genera, however, are not necessary to include in the definition and have their own taxonomic complications. Here they are excluded from the definition and allowed to fall where they may.

 

Potential Synonomy
Diplodocoidae (Hunt et al. 1994, Upchurch 1998, misspelling)

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Diplodocus longus Marsh 1878 but not Saltasaurus loricatus Bonaparte and Powell 1980.
Shorthand
> Diplodocus longus but not Saltasaurus loricatus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Neosauropoda, Macronaria
Specifiers
Specifier(s) A
Diplodocus longus
Specifier(s) B
Specifier(s) C
Saltasaurus loricatus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
Neosauropods more closely related to Diplodocus than to Saltasaurus, including Rayososaurus, Amphicoelias, dicraeosaurids, and diplodocids.
Latest Record
Wilson and Sereno 1998:63
Range (My)
Range (My)
Diplodocus, Saltasaurus
Range (My)
Rayososaurus, Amphicoelias, dicraeosaurids, diplodocids

Definitional History #2
Earliest Record
All neosauropods closer to Diplodocus than to Saltasaurus.
Latest Record
Sereno 1998:63
Range (My)
Range (My)
Diplodocus, Saltasaurus
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