Classification of the family Nucleolitidae
Fm. †Nucleolitidae Agassiz and Desor 1847
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G. †Nucleolites Lamarck 1801
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†Nucleolites hori Fourtau 1921
†Nucleolites scutatus Lamarck 1816
Invalid names: Echinobrissus Gray 1825 [objective synonym]
G. †Oolopygus
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†Catopygus (Oolopygus) gonzalezi Sanchez-Roig 1953
†Catopygus (Oolopygus) williamsi Clark 1907
†Oolopygus gracilis Lambert 1909
G. †Phyllobrissus Cotteau 1859
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†Phyllobrissus freitasii White 1887
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Invalid names: Stigmatopygus malheiroi de Loriol 1888 [synonym]
†Phyllobrissus gresslyi Agassiz 1839
Invalid names: Anthobrissus Pomel 1883 [synonym], Asterobrissus de Loriol 1888 [synonym]
G. †Plagiochasma
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†Plagiochasma cruciferum Morton 1830
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Invalid names: Nucleolites analis Agassiz 1857 [synonym], Pyrina freucheni Desor 1926 [synonym], Trematopygus analis dOrbigny 1855 [synonym]
†Plagiochasma lammersmaxi Jagt and Ham 2000
†Plagiochasma olfersii Agassiz 1836
†Plagiochasma orientalis Fourtau 1921
Invalid names: Dochmostoma Duncan 1891 [synonym], Trematopygus d'Orbigny 1857 [objective synonym]
G. †Pseudosorella
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†Pseudosorella orbignyana Cotteau 1855
†Pseudosorella syriacus de Loriol 1901
Invalid names: Neoclypeus de Loriol [synonym]
G. †Pygopistes Pomel
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†Pygopistes coquandi Cotteau 1869
†Pygopistes parrasae Parma and Casadío 2005
†Pygopistes rudistarum Hawkins 1923
G. †Pygorhynchus
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†Cassidulus (Pygorhynchus) sabistonensis Kellum 1931
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Invalid names: Cassidulus (Pygorhynchus) berryi Kellum 1926 [synonym]
†Nucleolites (Pygorhynchus) planatus Forbes 1846
†Nucleolites (Pygorhynchus) testudo Forbes 1846
†Pygorhynchus obovatus Agassiz 1836
Invalid names: Botriopygus d'Orbigny 1855 [objective synonym]