eight recognized classes of molluscs, five contain the majority of species:
Class Scaphopoda – tooth and tusk shells
Class Polyplacophora – chitons
Class Gastropoda – snails, slugs, limpets, whelks, conchs, periwinkles, etc.
Class Bivalvia – clams, oysters, mussels, scallops, cockles, shipworms, etc.
Class Cephalopoda – chambered nautilus, octopi, squids and cuttlefishes