Classification of the family Hadrophyllidae
Fm. †Hadrophyllidae Nicholson 1889
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G. †Crassicyclus Soto 1978
G. †Hadrophyllum Milne-Edwards and Haime 1850
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†Hadrophyllum aplatum Cummins 1891
†Hadrophyllum bifidum Bassler 1937
†Hadrophyllum delicatum Bassler 1937
†Hadrophyllum linguloideum Herzer 1901
†Hadrophyllum nauvooense Bassler 1937
†Hadrophyllum orbignyi Milne-Edwards and Haime 1851
†Hadrophyllum ovale Bassler 1937
†Hadrophyllum pauciradiatum Milne-Edwards and Haime 1851
†Hadrophyllum pedunculatum Bassler 1937
†Hadrophyllum romingeri Bassler 1937
†Hadrophyllum tennesseense Miller and Gurley 1895
†Hadrophyllum woodi Grabau 1899
G. †Microcyclus Meek and Worthen 1868
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†Microcyclus blairi Miller 1894
†Microcyclus discus Meek and Worthen 1868
†Microcyclus intermedius Bassler 1937
†Microcyclus leonensis Verneuil and Haime 1850
†Microcyclus lyrulatus Bassler 1937
†Microcyclus multiradiatus Meek 1868
†Microcyclus praecox Roemer 1844
†Microcyclus roberti Maitre 1952
†Microcyclus thedfordensis Bassler 1937
†Microcyclus tortuosus Maitre 1952