Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
         †Paulchoffatiid line
           Family †Pinheirodontidae Hahn & Hahn, 1999
             Genus †Ecprepaulax Hahn & Hahn, 1999 [monotypic]
               †Ecprepaulax anomala Hahn & Hahn, 1999