Classification of Seoane et al. 2019
Fm. †Hegetotheriidae Ameghino 1894
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Subfm. †Pachyrukhinae Kraglievich 1934
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G. †Prosotherium Ameghino 1897
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†Prosotherium garzoni Ameghino 1897
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Invalid names: Propachyrucos ameghinorum Simpson 1945 [synonym], Propachyrucos simpsoni Chaffee 1952 [synonym], Prosotherium quartum Ameghino 1901 [synonym], Prosotherium robustum Ameghino 1897 [synonym], Prosotherium triangulidens Ameghino 1897 [synonym]
Invalid names: Propachyrucos aequilatus Ameghino 1901 [nomen dubium], Propachyrucos crassus Ameghino 1897 [nomen dubium], Propachyrucos robustus Roth 1898 [nomen dubium]
G. †Pachyrukhos Ameghino 1885
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Invalid names: Propachyrucos depressus Roth 1898 [nomen dubium], Propachyrucos medianus Roth 1898 [nomen dubium]
G. †Prohegetotherium Ameghino 1897
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†Prohegetotherium schiaffinoi Kraglievich 1932