fossil marine animal genera Linnaeus, 1758 - animals Phylum Mollusca Linnaeus, 1758 - molluscs "Monoplacophora" Odhner, 1940 see Class Monoplacophora Odhner, 1940 Class †Helcionelloida Peel, 1991 see Order Helcionelliformes Golikov & Starobogatov, 1975