Classification of the order Helodontiformes
Or. †Helodontiformes
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Fm. †Helodontidae
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G. †Helodus Agassiz 1838
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†Helodus angulatus Newberry and Worthen 1866
†Helodus biformis Newberry and Worthen 1866
†Helodus carbonarius Newberry and Worthen 1866
†Helodus coniculus Newberry and Worthen 1866
†Helodus consolidatus Newberry and Worthen 1866
†Helodus crenulatus Newberry and Worthen 1866
†Helodus denshumani Newberry and Worthen 1866
†Helodus denticulatus Newberry and Worthen 1866
†Helodus didymus Agassiz 1843
†Helodus elytra Newberry and Worthen 1866
†Helodus gibberulus Agassiz 1836
†Helodus gibbus Leidy 1857
†Helodus incisus Eastman 1903
†Helodus laevis Newberry 1879
†Helodus limax Newberry and Worthen 1866
†Helodus mammillaris Agassiz 1843
†Helodus planus Agassiz 1843
†Helodus politus Newberry and Worthen 1866
†Helodus rudis M'Coy 1848
†Helodus rugosus Newberry and Worthen 1870
†Helodus simplex Agassiz 1838
†Helodus subpolitus Branson 1916
†Helodus subteres Agassiz 1836
†Helodus sulcatus Newberry and Worthen 1866
†Helodus undulatus Newberry and Worthen 1866
†Helodus wortheni Hay 1899