Classification of Ostrander 1987
Fm. Didelphidae Gray 1821 [opossum]
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G. †Peratherium Aymard 1850
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†Peratherium fugax Cope 1873
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Invalid names: Didelphys pygmaea Scott 1894 [synonym], Herpetotherium huntii Cope 1873 [synonym]
Invalid names: Herpetotherium Cope 1873 [synonym]
G. †Micropternodus Matthew 1903
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†Micropternodus strophensis White 1954
Invalid names: Kentrogomphios White 1954 [synonym]