Clade Mammaliaformes Rowe 1988 [Rowe 1988]
   [crown] Class Mammalia Linnaeus, 1758 - mammals
     Subclass Theriiformes (Rowe, 1988) M.C. McKenna & S.K. Bell, 1997 see Division Theriiformes
       Infraclass Holotheria (Wible et al., 1995) M.C. McKenna & S.K. Bell, 1997 see [unranked] Holotheria
         Superlegion Trechnotheria McKenna, 1975 see [unranked] Trechnotheria McKenna, 1975
           Legion Cladotheria McKenna, 1975 see [unranked] Cladotheria McKenna, 1975
             Sublegion Zatheria McKenna, 1975 see [unranked] Zatheria McKenna, 1975
               Infralegion Tribosphenida McKenna, 1975 see Sublegion Boreosphenida
                 Supercohort Theria (Parker & Haswell, 1897) M.C. McKenna & S.K. Bell, 1997 - therians see [unranked] Theria
                   Cohort Placentalia (Owen, 1837) M.C. McKenna & S.K. Bell, 1997 - placentals
                     Magnorder Epitheria (McKenna, 1975) M.C. McKenna & S.K. Bell, 1997 see Cohort Placentalia (Owen, 1837) M.C. McKenna & S.K. Bell, 1997
                       Superorder Preptotheria (McKenna, 1975) McKenna, 1993
                         Grandorder Ungulata Linnaeus, 1766
                           Mirorder Eparctocyona McKenna, 1975
                             Order Cete Linnaeus, 1758 see Order Cetartiodactyla Montgelard et al., 1997
                               Suborder Cetacea (Brisson, 1762) M.C. McKenna & S.K. Bell, 1997 - cetaceans
                                 Infraorder †Archaeoceti (Flower, 1883) M.C. McKenna & S.K. Bell, 1997
                                   Family †Protocetidae Stromer, 1908
                                     1 Genus †Rodhocetus P.D. Gingerich et al., 1994
                                     2 Genus †Eocetus Fraas, 1904
                                     3 Genus †Pappocetus Andrews, 1920
                                     4 Genus †Babiacetus Trivedi & Satsangi, 1984
                                     5 Genus †Takracetus Gingerich et al., 1995
                                     6 Genus †Gaviacetus Gingerich et al., 1995
                                     7 Subfamily †Pakicetinae Gingerich & D.E. Russell, 1990 see Family Pakicetidae
                                     8 Subfamily †Protocetinae (Stromer, 1908) Gingerich & Russell, 1990 see Family Protocetidae Stromer, 1908