Classification of Douglass 1907
G. †Eucrotaphus Leidy 1850
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†Eucrotaphus dickinsonensis Douglass 1907
†Eucrotaphus montanus Douglass 1907
G. †Ticholeptus Cope 1878
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†Ticholeptus bannackensis Douglass 1907
†Ticholeptus breviceps Douglass 1907
G. †Promerycochoerus Douglass 1901
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†Promerycochoerus grandis Douglass 1907
†Promerycochoerus hatcheri Douglass 1907
†Promerycochoerus hollandi Douglass 1907