Classification of Clemens 1963

Or. †Triconodonta Osborn 1888 [triconodont]
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Fm. †Triconodontidae Marsh 1887
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Invalid names: Triconodontinae Hay 1902 [empty]
Or. †Symmetrodonta Simpson 1925 [symmetrodont]
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Fm. †Spalacotheriidae Marsh 1887
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G. †Peralestes Owen 1871
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G. †Spalacotherium Owen 1854
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