Class Mammalia Linnaeus, 1758 - mammals Order †Morganucodonta Kermack, Mussett & Rigney, 1973, incertae sedis Family †Morganucodontidae Kühne, 1958 Genus †Helvetiodon Clemens, 1980 [monotypic] 1 †Helvetiodon schutzi Clemens, 1980