Kingdom Animalia Linnaeus, 1758 - animals
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   Phylum Mollusca Linnaeus, 1758 - molluscs
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     Subphylum Cyrtosoma Runnegar & Pojeta Jr., 1974 see Phylum Mollusca Linnaeus, 1758
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       Class Cephalopoda Cuvier, 1795 - cephalopods
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         Subclass †Endoceratoidea Teichert, 1933
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           Genus †Allopiloceras Ulrich & Foerste, 1935
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           Genus †Cameroceras Conrad, 1842
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           Genus †Cassinoceras Ulrich & Foerste, 1935
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           Genus †Cotteroceras Ulrich & Foerste, 1935
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           Genus †Endoceras Hall, 1847
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           Genus †Piloceras Salter, 1859
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