Classification of Evander 1999
Fm. Castoridae Gray 1821 [beaver]
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G. †Monosaulax Stirton 1935
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†Monosaulax curtus Matthew and Cook 1909
†Monosaulax pansus Cope 1874
†Monosaulax progressus Shotwell 1968
†Monosaulax typicus Shotwell 1968