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Clade
Subclade

Taxon
Taxon
Nemegtosauridae
Nominal Author
Upchurch 1995
2nd Nominal Author
Taxon Status INACTIVE
Comments
Potential Synonomy

Active Phylogenetic Definition
Active Definition
Shorthand
Definitional Author
Definition Status Unknown
Definition Type Unknown
Node-Stem Triplet Unknown
Other Triplet Taxa
Specifiers
Specifier(s) A
Specifier(s) B
Specifier(s) C
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown

Inactive Taxon Status
Rejection Criteria other
Critique

This taxon may have been first defined by Apesteguia (2004), who although not providing a numerical cladistic analysis, argued for a close relationship between Nemegtosaurus, Quaesitosaurus, Rapetosaurus, and Bonitasaura and referenced the phylogenetic analysis and use of Nemegtosauridae by Wilson (2002).  Unaware of this definition, Wilson (2005) proposed an identical definition, while clarifying further the anatomy and relationships of the key genus Nemegtosaurus.

Upchurch et al. also defined Nemegtosauridae in 2004.  In their analysis, the taxon encompassed Nemegtosaurus and Quaesitosaurus, which they placed within Diplodocoidea.  The latter genus may eventually shown to be a junior synonym of Nemegtosaurus (Wilson 2005).  More problematic is the use of  Diplodocus as an external specifier.

An useful active definition may eventually be constucted from a first-order revision of that in Apesteguia (2004) and Wilson (2005) using species rather than genera.

 

Definitional History #1
Earliest Record
All titanosaurs more closely related to Nemegtosaurus than to Saltasaurus.
Latest Record
Apesteguia 2004:496
Range (My)
Range (My)
Nemegtosaurus, Saltasaurus
Range (My)

Definitional History #2
Earliest Record
Diplodocoidea more closely related to Nemegtosaurus than to Diplodocus.
Latest Record
Upchurch et al. 2004:303
Range (My)
Range (My)
Nemegtosaurus, Diplodocus
Range (My)

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Definitional History #4
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Definitional History #6
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Definitional History #7
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Definitional History #9
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Definitional History #10
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