Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Infraclass Tribosphenida McKenna, 1975 see Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001
       Supercohort Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
         Cohort Edentata Cuvier, 1798
           Order †Palaeanodonta Matthew, 1918
             Family †Epoicotheriidae Simpson, 1927
               Subfamily †Epoicotheriinae Simpson, 1927
                 ?Genus †Tetrapassalus Simpson, 1959
                   1 †Tetrapassalus mckennaiᵀ Simpson, 1959
                   2 †Tetrapassalus proius West, 1973