Class Mammalia Linnaeus, 1758 - mammals
   Subclass †Allotheria Marsh, 1880
     Order †Multituberculata Cope, 1884
       Suborder †"Plagiaulacida" Ameghino, 1889 [paraphyletic]
         †Plagiaulacid line
           Family †Albionbaataridae Kielan-Jaworowska & Ensom, 1994
             Genus †Proalbionbaatar Hahn & Hahn, 1998 [monotypic]
               †Proalbionbaatar plagiocyrtus Hahn & Hahn, 1998