Classification of the family Cucullellidae
Fm. †Cucullellidae Fischer 1886
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Subfm. †Cucullellinae Fischer 1886
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G. †Nuculites Conrad 1841
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Subg. †Nuculites (Gonionuculites) Babin et al. 2001
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†Nuculites (Gonionuculites) celticus Babin et al. 2001
†Nuculites ichikawai Nakazawa and Newell 1968
†Nuculites kimuari Hayasaka 1924
†Nuculites neglectus Hall 1862
†Nuculites oblongatus Conrad 1841
†Nuculites planulatus Conrad 1841
†Nuculites suboblongatus Kobayashi 1934
†Nuculites wattii Tate 1896
Invalid names: Cleidophorus Hall 1847 [synonym], Cucullella McCoy 1851 [synonym], Pyrenomoeus Hall 1852 [synonym]
Invalid names: Nuculitidae Bradshaw 1999 [synonym], Palaeoneilinae Babin 1966 [empty]