Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     Infraclass Metatheria Huxley, 1880
       Cohort Marsupialia Jameson, 1818 - marsupials
         Superorder "Ameridelphia" Szalay, 1982 [paraphyletic] see Clade Ameridelphia Szalay 1982
           Order "Didelphimorphia" Gill, 1872 [paraphyletic]
             Family †"Pediomyidae" Simpson, 1927 [monophyletic?]
               Genus †"Pediomys"ᵀ Marsh, 1889 [monophyletic?]
                 1 †"Pediomys" elegansᵀ Marsh, 1889
                 2 †"Pediomys" clemensi Sahni, 1972 see Protolambda clemensi (Sahni, 1972)
                 3 †"Pediomys" cooki Clemens, 1966 see Leptalestes cooki (Clemens, 1966)
                 4 †"Pediomys" exiguus Fox, 1971 see Apistodon exiguus (Fox, 1971)
                 5 †"Pediomys" fassetti Rigby & Wolberg, 1987 see Leptalestes prokrejcii (Fox, 1979)
                 6 †"Pediomys" florencae Clemens, 1966 see Protolambda florencae (Clemens, 1966)
                 7 †"Pediomys" hatcheri (Osborn, 1898) see Protolambda hatcheri (Osborn, 1898)
                 8 †"Pediomys" krejcii Clemens, 1966 see Leptalestes krejcii (Clemens, 1966)
                 9 †"Pediomys" prokrejcii Fox, 1979 see Leptalestes prokrejcii (Fox, 1979)