Abstract Over the past two decades, numerous species of tethysuchian crocodyliforms have been described, and their phylogenetic relationships have increasingly received more attention. Consequently, several tethysuchian clade names have been erected following the International Code of Phylogenetic Nomenclature (PhyloCode) and/or the International Code of Zoological Nomenclature (ICZN). To help maintain taxonomic and nomenclatural stability, we have decided to establish a suprageneric classification for Tethysuchia that is consistent across both nomenclatural codes. Here, we provide phylogenetic definitions that are valid under the PhyloCode for the following pre-existing names: Tethysuchia, Pholidosauridae, Dyrosauroidea, Dyrosauridae, Phosphatosaurinae, and Hyposaurinae. However, under the articles of the ICZN Code, the senior synonym, Dyrosaurinae, should be used instead of Hyposaurinae. Awaiting a decision from the ICZN Commission, we consider the use of Hyposaurinae to be preferable because the name is in prevailing usage. Finally, given that there is no consensus on which clade is the sister taxon of Tethysuchia, we redefined the pre-existing name Coelognathosuchia for the Tethysuchia + Goniopholididae phylogenetic hypothesis and erected the new name Stenorhynchosuchia for the alternative hypothesis formed by Tethysuchia + Thalattosuchia.
Jouve et al. (Tue,) studied this question.