Clade Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
   Clade Trechnotheria McKenna 1975
     Clade Alethinotheria Averianov, Martin & Lopatin 2013
       Clade †Meridiolestida Rougier, Apesteguía & Gaetano 2011 see Order Meridiolestida Rougier, Apesteguía & Gaetano, 2011
         1 Genus †Cronopio Rougier, Apesteguía & Gaetano, 2011
         2.1 Genus †Necrolestes Ameghino, 1891
         2.2.1 Genus †Leonardus Bonaparte, 1990
         2.2.2.1 Genus †Mesungulatum Bonaparte & Soria, 1985
         2.2.2.2 Genus †Coloniatherium Rougier, Forasiepi, Hill & Novacek, 2009
         2.2.2.3.1 Genus †Reigitherium Bonaparte, 1990
         2.2.2.3.2 Genus †Peligrotherium Bonaparte, van Valen & Kramartz, 1993