Classification of Robinson 1957

G. †Notharctus Leidy 1870
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†Notharctus gracilis Marsh 1871
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Invalid names: Notharctus matthewi Granger and Gregory 1917 [synonym], Pelycodus relictus Gregory 1917 [synonym]
†Notharctus robustior Leidy 1872
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Invalid names: Telmalestes crassus Marsh 1872 [synonym]
†Notharctus tenebrosus Leidy 1870
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Invalid names: Hipposyus formosus Leidy 1872 [synonym], Limnotherium affine Marsh 1872 [synonym], Limnotherium tyrannus Marsh 1871 [synonym], Notharctus osborni Granger and Gregory 1917 [synonym], Notharctus pugnax Granger and Gregory 1917 [synonym], Thinolestes anceps Marsh 1872 [synonym], Tomitherium rostratum Cope 1872 [synonym]