Classification of the genus Prototomus
G. †Prototomus Cope 1874
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†Prototomus deimos Gingerich and Deutsch 1989
†Prototomus girardoti Smith and Smith 2001
†Prototomus martis Gingerich and Deutsch 1989
†Prototomus minimus Smith and Smith 2001
†Prototomus multicuspis Cope 1875
†Prototomus phobos Gingerich and Deutsch 1989
†Prototomus robustus Matthew and Granger 1915
†Prototomus secundarius Cope 1875