Mammalia Linnaeus, 1758
Acrodelphinidae Rice, 1984
Acrophyseter
Aetiocetidae Emlong, 1966
Agorophiidae Abel, 1913
Agriocetus Abel, 1913
Albireonidae Barnes, 1984
Allodelphinidae Barnes, 2006
Ambulocetidae Thewissen et al., 1996
Anglocetus Tarlo, 1964
Apenophyseter Cabrera, 1926
Australosqualodon
Balaenidae Gray, 1821
Balaenodontae
Balaenopteridae Gray, 1864
Basilosauridae Cope, 1868
Cetotheriidae Brandt, 1872
Cetotheriomorphis
Cetotheriopsidae Brandt, 1872
Colophonodon Leidy, 1853
Dalpiazinidae Muizon, 1988
Delphinidae Gray, 1821
Dinoziphius Beneden, 1880
Diorocetus
Eoplatanistidae
Epiodontidae
Eschrichtiidae Ellerman & Morrison-Scott, 1951
Eucetotherium Spasski, 1954
Eurhinodelphidae Abel, 1901
Eurhinodelphinidae Abel, 1901
Graamocetus
Hapalodectidae Ting & Li, 1987
Haplocetus
Hemisyntrachelidae Slijper, 1936
Hyperoodontidae Gray, 1846
Ichthyoletes
Imerocetus Mchedlidze, 1964
Iniidae Gray, 1846
Isocetus Van Beneden, 1880
Janjucetidae
Kampholophus
Kentriodontidae Slijper, 1936
Kogiidae Gill, 1871
Lipotidae Zhou, Qian & Li, 1978
Livyatan Lambert, Bianucci, Post, de Muizon, Salas-Gismondi, Urbina & Reumer, 2010
Loncodelphis
Mammalodontidae
Manicetus
Medoicinia
Mesodon Trouessart, 1898
Mesonychidae Cope, 1880
Microsqualodon Abel, 1905
Microzeuglodontidae
Mioceta Deraniyagala, 1967
Miotursiops Deraniyagala, 1969
Mixocetus Kellogg, 1934
Monodontidae Gray, 1821
Nanisocetus
Neobalaenidae Gray, 1873
Neosqualodon
Odobenocetopsidae Muizon, 1993
Otradnocetus
Pachycetus Beneden, 1883
Pagiodon Peters, 1870
Palaeocetidae
Parapontoparia
Patriocetidae
Periplocetus
Peripolocetus Kellogg, 1931
Phocaenopsis Huxley, 1859
Phococetus Gervais, 1876
Phocoenidae Gray, 1825
Physalidae
Physeteridae Gray, 1821
Piscocetus Pilleri & Pilleri, 1989
Platanistidae Gray, 1846
Platyrhynchus van Beneden, 1876
Plesiocetopsis Spasski, 1954
Pontivaga Ameghino, 1891
Potamodelphis
Prioinia
Procetus
Prosqualodontidae
Proterocetidae
Protocetidae Stromer, 1908
Pterobalaenidae
Remingtonocetidae Kumar & Sahni, 1986
Rhabdosteidae Gill, 1871
Rhabodosteus
Rhegnopsis Cope, 1896
Rhynchoceti
Rhytisodon Costa, 1853
Sachalinocetus Dubrovo, 1971
Salumniphocaena
Sormatodelphis
Squalodelphidae Dal Piaz, 1917
Squalodelphinidae
Squalodontidae Brandt, 1873
Stenodon van Beneden, 1865
Tangarasaurus
Tiphyocetus Kellogg, 1931
Titanocetus
Tretosphrys
Triisodontidae
Trirhizodon Cope, 1890
Waipatiidae Fordyce, 1994
Xenorophidae
Zignodelphidae Rice, 1998
Zignodelphinidae
Zignodelphis Pilleri, 1989
Ziphiidae Gray, 1850