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