fossil marine animal genera Linnaeus, 1758 - animals Count: [o†o] 22p;50c;198o;128g; †4p;59c;298o;1f;2584g Phylum Mollusca Linnaeus, 1758 - molluscs Count: [o†o] 5c;30o; †8c;45o;45g Class Gastropoda Cuvier, 1795 - snails and slugs Count: [o†o] 13o; †4o Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs see Order Opisthobranchia Milne-Edwards, 1848 Count: [o†o] 6o; †1o Order Sacoglossa Ihering, 1876 - sacoglossans Count: -