Classification of Toni 1975

Fm. †Ambonychiidae Miller 1877
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G. †Ambonychia Hall 1847
G. †Cleionychia Ulrich 1892
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†Cleionychia corrugata Lindström 1880
†Cleionychia lamellosa Whitfield 1882
†Cleionychia primitiva Isberg 1934
†Cleionychia pulchella Lindstrom 1880
G. †Clionychia Ulrich 1892
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†Clionychia rhomboidea Ulrich 1892
Fm. †Ctenodontidae Wöhrmann 1893
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G. †Ctenodonta Salter 1852
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†Ctenodonta dubia Hall 1847
†Ctenodonta nasuta Hall 1847
G. †Tancrediopsis Beushausen 1895
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†Tancrediopsis contracta Salter 1859
Fm. †Cyrtodontidae Ulrich 1894
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G. †Cyrtodonta Billings 1858
G. †Cyrtodontula Tomlin 1931
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†Cyrtodontula obliquata Ulrich 1890
†Cyrtodontula truncata Ulrich 1890
Fm. †Grammysiidae Miller 1877
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G. †Cuneamya Hall and Whitfield 1875
Subfm. Malletiinae Adams and Adams 1858
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G. †Nuculites Conrad 1841
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†Nuculites planulatus Conrad 1841
Fm. †Modiomorphidae Miller 1877
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G. †Modiolopsis Hall 1847
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†Modiolopsis exilis Billings 1874
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Invalid names: Modiolopsis ruda Billings 1874 [synonym]
†Modiolopsis leptaenarum Isberg 1934
†Modiolopsis modiolaris Conrad 1838
†Modiolopsis nilssoni Hisinger 1837
G. †Semicorallidomus Isberg 1934
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Fm. †Praenuculidae McAlester 1968
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G. †Similodonta Soot-Ryen 1964
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†Similodonta similis Ulrich 1892
†Similodonta spjeldnaesi Soot-Ryen and Soot-Ryen 1960
Fm. †Modiolopsidae Fischer 1885
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G. †Goniophorina Isberg 1934
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†Goniophorina volvens Isberg 1934
†Ambonychia radiata Ulrich 1894
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Invalid names: Ambonychia radiata Hall 1847 [synonym]