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