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Clade
Subclade

Taxon
Taxon
Brachiosauridae
Nominal Author
Riggs 1904
2nd Nominal Author
Taxon Status ACTIVE
Comments
Brachiosauridae was first defined as a stem-based taxon by Wilson and Sereno (1998) and Sereno (1988) using Brachiosaurus and Saltasaurus as specifiers. The active definition is a first-order revision that uses species and includes two additional external specifiers (Euhelopus zdanskyi, Camarasaurus lentus) to ensure that these will be excluded should they prove more closely related to Brachiosaurus brancai. Camarasaurus lentus is used rather than the type species Camarasaurus supremus, as it is represented by clearly associated skulls and skeletons and is the species most often used to represent Camarasaurus in phylogenetic analysis (either explicitly or implicitly).
Potential Synonomy

Active Phylogenetic Definition
Active Definition
The most inclusive clade containing Brachiosaurus brancai Janensch 1914 but not Saltasaurus loricatus Bonaparte and Powell 1980, Euhelopus zdanskyi Wiman 1929, Camarasaurus lentus Marsh 1889.
Shorthand
> Brachiosaurus brancai but not Saltasaurus loricatus, Euhelopus zdanskyi, Camarasaurus lentus.
Definitional Author
Sereno 2005
Definition Status checked
Definition Type STEM
Node-Stem Triplet STEM
Other Triplet Taxa
Titanosauriformes, Somphospondyli
Specifiers
Specifier(s) A
Brachiosaurus brancai
Specifier(s) B
Specifier(s) C
Saltasaurus loricatus, Euhelopus zdanskyi, Camarasaurus lentus
Qualifiers
+Taxon
-Taxon
Datum
Taxonomic Content
Publication Year Unknown
Unknown
Unknown
1998

Inactive Taxon Status
Rejection Criteria
Critique
 

Definitional History #1
Earliest Record
Titanosauriforms more closely related to Brachiosaurus than to Saltasaurus, including, by this definition, the French “Bothriospondylus” madagascarensis (i.e., not the material from Madagascar), Brachiosaurus, Eucamerotus, and Pleurocoelus.
Latest Record
Wilson and Sereno 1998:20-21
Range (My)
Range (My)
Brachiosaurus than to Saltasaurus, including, by this definition, the French “Bothriospondylus” madagascarensis, Brachiosaurus, Eucamerotus, Pleurocoelus
Range (My)

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