Classification of Merriam 1919
G. †Merycochoerus Leidy 1858
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Subg. †Merycochoerus (Pronomotherium) Douglass 1907
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†Merycochoerus (Pronomotherium) californicus Merriam 1919
†Merycochoerus buwaldi Merriam 1919
G. †Merychippus Leidy 1856
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G. †Ischyrosmilus Merriam 1918
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†Ischyrosmilus ischyrus Merriam 1905
†Ischyrosmilus osborni Merriam 1919