Phylum Mollusca Linnaeus, 1758 - molluscs
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   Conchifera Gegenbaur, 1878 see Subphylum Conchifera Gegenbauer, 1878
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     Cyrtosoma
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       Class Cephalopoda Cuvier, 1795 - cephalopods
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         1 Nautiloidea Agassiz, 1848 see Subclass Nautiloidea Agassiz, 1848
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         2 †Ammonoidea see Subclass Ammonoidea Zittel, 1884
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         3 Coleoidea Bather, 1888 see Subclass Coleoidea Bather, 1888
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