1. Family Delphinidae Gray, 1821
2. Family Kogiidae Gill, 1871
3. Family Monodontidae Gray, 1821
4. Family Phocoenidae
5. Family Physeteridae
6. Family Pontoporiidae Gray, 1870
7. Family Ziphiidae Gray, 1850
8. Family Belugidae Gray, 1868 accepted as Monodontidae Gray, 1821 (synonym)
9. Family Catodontidae F. Cuvier, 1836 accepted as Physeteridae (synonym)
10. Family Delphinapteridae Slijper, 1936 accepted as Monodontidae Gray, 1821 (synonym)
11. Family Delphinapteridae Kasuya, 1973 accepted as Delphinidae Gray, 1821 (synonym for part of Delphinidae (Delphinapterus and Orcaella))
12. Family Delphinoidae Guerin, 1874 accepted as Delphinidae Gray, 1821 (synonym)
13. Family Delphinusideae Lesson, 1842 accepted as Delphinidae Gray, 1821 (synonym)
14. Family Globicephalidae Nishiwaki, 1963 accepted as Globicephalinae Le Duc, 1997 (synonym for part of Globicephalinae)
15. Family Globidelphinidae Nishiwaki, 1963 accepted as Delphinidae Gray, 1821 (misspelling)
16. Family Globiocephalidae Gray, 1850 accepted as Globicephalinae Le Duc, 1997 (misspelling)
17. Family Grampidae Gray, 1871 accepted as Globicephalinae Le Duc, 1997 (synonym for part of Globicephalinae)
18. Family Heterodontidae Girard, 1852 accepted as Ziphiidae Gray, 1850 (synonym)
19. Family Holodontidae Brandt, 1873 (divided into several families)
20. Family Hyperoodontidae Gray, 1846 accepted as Ziphiidae Gray, 1850 (synonym)
21. Family Hypognathodontidae Brandt, 1873 (divided into Ziphiidae and Physeteridae)
22. Family Norvallidae Burnett, 1830 accepted as Monodontidae Gray, 1821 (synonym)
23. Family Orcadae Gray, 1871 accepted as Delphinidae Gray, 1821 (Preoccupied)
24. Family Orcaelidae Nishiwaki, 1972 accepted as Delphinidae Gray, 1821 (misspelling Orcaellidae)
25. Family Orcaellidae Nishiwaki, 1963 accepted as Delphinidae Gray, 1821 (synonym)
26. Family Stenidae Fraser & Purves, 1960 accepted as Stenoninae Le Duc, 1997 (Preoccupied)
27. Family Susuidae Hershkovitz, 1966 accepted as Platanistidae Gray, 1846 (synonym for part of Platanistidae)
28. Family Susuoidea Gray, 1868 accepted as Platanistidae Gray, 1846 (synonym)
29. Family Tachynicidae Brookes, 1828 accepted as Monodontidae Gray, 1821 (synonym)
30. Family Xiphidae Ameghino, 1889 accepted as Ziphiidae Gray, 1850 (synonym)
31. Family Odontoceti incertae sedis (temporary name)
32. Family Delphinorhynchidae Sclater, 1887 (uncertain > nomen dubium)

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