Class [Reptilia] Linnaeus, 1758 - reptiles
   Subclass †Placodontomorpha Kuhn, 1968
     Order †Placodontia Owen, 1859
       1 Suborder †Helveticosauroidea Peyer, 1955 [monotypic] see Order Placodontia Owen, 1859
       2 Suborder †Placodontoidea Peyer & Kuhn-Schnyder, 1955 see Order Placodontia Owen, 1859
       3 Suborder †Cyamodontoidea Peyer & Kuhn-Schnyder, 1955 see Order Placodontia Owen, 1859
       4 Suborder †Henodontoidea Kuhn, 1961 [monotypic] see Order Placodontia Owen, 1859