Classification of Olsen 1956
G. †Cynodesmus Scott 1893
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†Cynodesmus iamonensis Sellards 1916
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Invalid names: Cynodesmus nobilis Simpson 1932 [synonym], Paradaphoenus tropicalis White 1942 [synonym]
G. †Tomarctus Cope 1873
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†Tomarctus canavus Simpson 1932
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Invalid names: Nothocyon insularis White 1942 [synonym], Tomarctus thomasi White 1941 [synonym]
†Tomarctus thomsoni Matthew 1907
†Tomarctus brevirostris Cope 1873
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Invalid names: Tephrocyon hippophagus Matthew and Cook 1909 [synonym]