[Theria] Parker & Haswell 1897 [McKenna 1975] see Subclass Theria Parker & Haswell, 1897
   Eutheria Gill 1872 [O'Leary, Allard, Novacek, Meng & Gatesy 2004] see Infraclass Eutheria Gill, 1872
     Boreoeutheria Springer & de Jong 2001 see Magnorder Boreoeutheria Springer & de Jong, 2001
       Laurasiatheria Waddell, Okada & Hasegawa 1999 see Superorder Laurasiatheria Waddell, Okada & Hasegawa, 1999
         Scrotifera Waddell, Cao, Hauf & Hasegawa 1999
           1 Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
           2 Pegasoferae Nishihara, Hasegawa & Okada 2006 see Clade Scrotifera Waddell, Cao, Hauf & Hasegawa 1999