| Questionably †Agabelus (Genus) Cope, 1875, nom. dub. | |
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| Questionably †Agorophiidae (Family) Abel, 1913 | |
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| Questionably †Araeodelphis (Genus) Kellogg, 1957 | |
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| Questionably †Archaeodelphis (Genus) Allen, 1921 | |
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| Questionably †Atropatenocetus (Genus) Aslanova, 1977 | |
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| Questionably †Belosphys (Genus) Cope, 1875, nom. dub. | |
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| Questionably †Ceterhinops (Genus) Leidy, 1877 | |
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| Questionably †Delphinavus (Genus) Lull, 1914 | |
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| Questionably †Graphiodon (Genus) Leidy, 1870, nom. dub. | |
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| Questionably †Hadrodelphis (Genus) Kellogg, 1966 | |
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| Questionably †Hesperocetus (Genus) True, 1912, nom. dub. | |
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| Questionably †Heterodelphis (Genus) Brandt, 1873 | |
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| Questionably †Imerodelphis (Genus) Mchedlidze, 1959 | |
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| Questionably †Incacetus (Genus) Colbert, 1944 | |
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| Questionably †Iniopsis (Genus) Lydekker, 1893 | |
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| Questionably †Ixacanthus (Genus) Cope, 1868, nom. dub. | |
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| Questionably †Kharthlidelphis (Genus) Mchedlidze & Pilleri, 1988 | |
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| Questionably †Lamprolithax (Genus) Kellogg, 1931 | |
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| Questionably †Lonchodelphis (Genus) Allen, 1924, nom. dub. | |
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| Questionably †Loxolithax (Genus) Kellogg, 1931 | |
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| Questionably †Macrochirifer (Genus) Brandt, 1874, nom. dub. | |
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| Questionably †Microzeuglodon (Genus) Stromer, 1903 | |
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| Questionably †Miodelphis (Genus) Wilson, 1935 | |
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| Questionably †Mirocetus (Genus) Mchedlidze, 1970 | |
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| Questionably †Nannolithax (Genus) Kellogg, 1931 | |
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| Questionably †Oedolithax (Genus) Kellogg, 1931 | |
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| Questionably †Oligodelphis (Genus) Aslanova & Mchedlidze, 1976 | |
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| Questionably †Pelodelphis (Genus) Kellogg, 1955, nom. dub. | |
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| Questionably †Phocageneus (Genus) Leidy, 1869 | |
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| Questionably †Platylithax (Genus) Kellogg, 1931 | |
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| Questionably †Protodelphinus (Genus) Dal Piaz, 1922 | |
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| Questionably †Scaptodon (Genus) Chapman, 1918, nom. dub. | |
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| Questionably †Sinanodelphis (Genus) Makiyama, 1936 | |
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| Questionably †Squalodontoidea (Superfamily) Brandt, 1873 | |
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| Questionably †Tretosphys (Genus) Cope, 1868, nom. dub. | |
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| Questionably †Xenorophus (Genus) Kellogg, 1923 | |
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