Class [Reptilia] Linnaeus, 1758 - reptiles Subclass †Placodontomorpha Kuhn, 1968 Order †Placodontia Owen, 1859 Suborder †Helveticosauroidea Peyer, 1955 [monotypic] see Order Placodontia Owen, 1859 1 Family †Helveticosauridae Peyer, 1955