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Clade
Subclade Archosauria: Avemetatarsalia to Neornithes 

Taxon Feedback
Taxon Somphospondyli 
Nominal Author Wilson and Sereno 1998 
2° Nominal Author  
Taxon Status active
inactive
Comments The taxon was coined and defined by Wilson and Sereno (1998) and defined in the same year in a similar manner by Sereno (1998). The active definition is a first-order revision of these earlier definitions that lists species as specifiers. 
Potential Synonomy  

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 titanosaurian is Janenschia (= Torneria, Gigantosaurus) robusta from the Upper Jurassic (Kimmeridgian) of Tanzania. The latest record are titanosaurians from Maastrichtian-age beds on several continents. 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 Titanosauriforms more closely related to Saltasaurus than to Brachiosaurus
Author Wilson and Sereno 1998:53 
Type node  stem 
Specifiers Saltasaurus, Brachiosaurus 
Qualifiers  

Definitional History #2
Definition 2 All titanosauriforms closer to Saltasaurus than to Brachiosaurus
Author Sereno 1998:63 
Type node  stem 
Specifiers Saltasaurus, Brachiosaurus 
Qualifiers