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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 

Taxon Feedback
Taxon Nemegtosauridae 
Nominal Author Upchurch 1995 
2° Nominal Author  
Taxon Status active
inactive
Comments  
Potential Synonomy  

Inactive Taxon Status Feedback
Rejection Criteria junior synonym
historically polyphyletic
incomplete definition
no definition
apomorphy-based
redundant
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.

 
 

Current Age Range Feedback
Earliest Record  
Latest Record  
Range (My)  
Basis for Range  

Definitional History #1
Definition 1 All titanosaurs more closely related to Nemegtosaurus than to Saltasaurus
Author Apesteguia 2004:496 
Type node  stem 
Specifiers Nemegtosaurus, Saltasaurus 
Qualifiers  

Definitional History #2
Definition 2 Diplodocoidea more closely related to Nemegtosaurus than to Diplodocus
Author Upchurch et al. 2004:303 
Type node  stem 
Specifiers Nemegtosaurus, Diplodocus 
Qualifiers