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Clade
Subclade Archosauria: Crurotarsi to Crocodylia 

Taxon Feedback
Taxon Suchia 
Nominal Author Krebs 1974 
2° Nominal Author  
Taxon Status active
inactive
Comments Sereno (1991:11) provided a node-based definition for Suchia. Parrish (1993:296) remarked that Suchia is “Crocodylotarsi less Parasuchia”, but did not provide a definition. The active definition is a first-order revision of the only existing definition (Sereno 1991) that includes specifiers for Gracilisuchus and the clades most likely to be basal. In this manner, Suchia captures the concept first articulated by Krebs (1974) and put on a cladogram by Benton and Clark (1988). Ornithosuchidae is not included or excluded by definition. Should ornithosuchid relationships lie within Suchia as defined, they naturally would be regarded as suchians. 
Potential Synonomy  

Active Phylogenetic Definition Feedback
Active Definition The least inclusive clade containing Aetosaurus ferratus Fraas 1877 and Rauisuchus tiradentes Huene 1942, Prestosuchus chiniquensis Huene 1942, Gracilisuchus stipanicicorum Romer 1972, Crocodylus niloticus (Laurenti 1768). 
Shorthand < Aetosaurus ferratus and Rauisuchus triradentes, Prestosuchus chiniquensis, Gracilisuchus stipanicicorum, Crocodylus niloticus
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  
Specifiers
Specifier A Aetosaurus ferratus 
Specifier(s) B Rauisuchus triradentes, Prestosuchus chiniquensis, Gracilisuchus stipanicicorum, Crocodylus niloticus 
Specifier(s) C  
Qualifiers
+Taxon  
-Taxon  
Datum  
Taxonomic Content stem (entirely extinct)
crown (extant-bounded)
mixed (extant/extinct-bounded)
Publication Year 1991 

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 Anisian (245 Ma) 
Latest Record Recent 
Range (My) 245 
Basis for Range The earliest record is Ticinosuchus ferox from Anisian-age beds in Germany (Krebs 1965). The latest record includes extant crocodylians. 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 Suchia includes Gracilisuchus stipanicicorum, Aetosauria, Rauisuchia, Poposauridae, Crocodylomorpha, and all descendants of their common ancestor. 
Author Sereno 1991:11 
Type node  stem 
Specifiers Gracilisuchus stipanicicorum, Aetosauria, Rauisuchia, Poposauridae, Crocodylomorpha 
Qualifiers