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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 

Taxon Feedback
Taxon Neosauropoda 
Nominal Author Bonaparte 1986 
2° Nominal Author  
Taxon Status active
inactive
Comments

Salgado et al. (1997) defined Neosauropoda on the basis of maximally-inclusive specifiers rather than species. Wilson and Sereno (1998) and Sereno (1998) used genera. All are pointing to the same node-based clade. The active definiton is a first-order revision of that in Salgado et al. (1997).

Note that Upchurch (1998:84) attributed authorship of Neosauropoda to Upchurch (1995); the taxon, however, was coined nearly a decade earlier by Bonaparte (1986).

 
Potential Synonomy  

Active Phylogenetic Definition Feedback
Active Definition The least inclusive clade containing Saltasaurus loricatus Bonaparte and Powell 1980 and Diplodocus longus Marsh 1878. 
Shorthand < Saltasaurus loricatus and Diplodocus longus
Definitional Author Sereno 2005 
Definition Status original
textual substitution
first-order revision
second-order revision
Definition Type node
stem
Node-Stem Triplet yes
no
Other Triplet Taxa Macronaria, Diplodocoidea 
Specifiers
Specifier A Saltasaurus loricatus 
Specifier(s) B  
Specifier(s) C Diplodocus longus 
Qualifiers
+Taxon  
-Taxon  
Datum  
Taxonomic Content stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year 1997 

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

Current Age Range Feedback
Earliest Record Kimmeridgian (156 Ma) 
Latest Record Maastrichtian (66 Ma) 
Range (My) 90 
Basis for Range The earliest definitive records of either subclade of neosauropods (Diplodocidea, Macronaria) appears to be from the Kimmeridgian (Dicraeosuarus hansemanni and others; Janenschia robusta). The latest record are several titanosaurians of Maastrichtian age. Dates are rounded to the nearest million, the earliest from the beginning of the stage and the latest from the end of the stage (Gradstein et al. 2004). 

Definitional History #1
Definition 1 The clade including the most recent common ancestor of Diplodocidae and Camarasauromorpha and all of its descenddants. 
Author Salgado et al. 1997:8 
Type node  stem 
Specifiers Diplodocidae, Camarasauromorpha 
Qualifiers  

Definitional History #2
Definition 2 Diplodocus, Saltasaurus, their common ancestor and all its descendants, including by this definition Diplodocoidea and Macronaria. 
Author Wilson and Sereno 1998:46 
Type node  stem 
Specifiers Diplodocus, Saltasaurus 
Qualifiers  

Definitional History #3
Definition 3 Diplodocus, Saltasaurus, their most recent common ancestor and all descendants. 
Author Sereno 1998:63 
Type node  stem 
Specifiers Diplodocus, Saltasaurus 
Qualifiers