Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
         †Plagiaulacid line
           Genus †Janumys Eaton & Cifelli, 2001, incertae sedis [monotypic]
             †Janumys erebos Eaton & Cifelli, 2001