Archosauria: Crurotarsi to Crocodylia
2° Nominal Author
Most of the suprageneric taxa based on
are probably polyphyletic, although decisive hypotheses of relationship have been difficult to establish (Gower 2000). The active definition is the first for Rauisuchidae and is based on the nominotypical genus and species
. The definition is stem-based so that it will include taxa that are most closely related to
but exclude taxa more closely related to other crurotarsal clades.
Inactive Taxon Status
Current Age Range
Carnian (228 Ma)
Carnian (217 Ma)
Basis for Range
The earliest record is
from the Carnian-age Sanata Maria Formation of Brazil (Huene 1942). The latest record is tetatively set at the end of the Carnian stage but is expected to be extended when younger taxa are more effecctively tied to the nominotypical species. 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).