Classification of Marshall 1979

Subfm. †Proborhyaeninae Ameghino 1897
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G. †Stylocynus Mercerat 1917
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Stylocynus paranensis Mercerat 1917
Superfm. †Borhyaenoidea Ameghino 1894
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Fm. †Borhyaenidae Savage 1951
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Subfm. †Prothylacyninae Ameghino 1894
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G. †Lycopsis Goin 1997
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Lycopsis longirostrus Marshall 1977
Lycopsis torresi Cabrera 1927
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Invalid names: Anatherium oxyrhynchus Ameghino 1894 [synonym]
G. †Prothylacynus Ameghino 1891
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Prothylacynus patagonicus Ameghino 1891
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Invalid names: Agustylus carnifex Mercerat 1891 [synonym], Borhyaena excavata Ameghino 1894 [synonym], Napodonictis thylacynoides Ameghino 1894 [synonym], Prothylacynus brachyrhynchus Ameghino 1894 [synonym]
Invalid names: Napodonictis Ameghino 1894 [synonym], Prothylacocyon Winge 1923 [objective synonym]
G. †Pseudolycopsis Marschall 1976
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Pseudolycopsis cabrerai Marshall 1976
G. †Pseudothylacynus Ameghino 1902
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Pseudothylacynus rectus Ameghino 1902