article: Gastropoda
links: Convergent evolution Georges Cuvier Coal Morphology (biology) England Cambrian Palaeozoic DNA Mantle (mollusc) Cretaceous Heterobranchia Mesozoic Animal Warning colouration Jurassic Sea grass Ordovician Cowry Slug Helix (gastropod) Patellogastropoda Western Interior Seaway Pleistocene Mollusca Silurian Cainozoic Ocean Carboniferous Europe