Class [Reptilia] Linnaeus, 1758 - reptiles
   Subclass Lepidosauria Duméril & Bibron, 1839
     Order †Protorosauria Huxley, 1871
       1 Suborder †Protorosauroidea Kuhn, 1969 [monotypic]
       2 Suborder †Prolacertoidea Hoffstetter, 1955 [monotypic]
       3 Suborder †Trachelosauroidea Broili, 1918 [monotypic]
       4 Suborder †Tanysitracheloidea Peyer, 1931 [monotypic]