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Characteristics of molluscs. 1  unsegmented soft body. 2  most have internal or external shell. 3  have a mantle-a fold in the body wall that secretes the hard prtesctive shell. 4  muscular foot and/or tentacles. 5  have a radula-a toothed structure used to grate food.haracteristics of molluscs unsegmented soft body most have internal or external shell have a mantle-a fold in the body wall that secretes the hard prtesctive shell muscular foot and/or tentacles have a radula-a toothed structure used to grate food two pairs of gills except in polmonate snails.
Mollusk Shells. Many species of mollusks such as scallops, snails, mussels and oysters possess an obvious external shell that helps protect the animal from predators. The shell also helps protect species that inhabit tidal zones from the threat of desiccation by trapping life-sustaining moisture and oxygen.ther species such as scallops and oysters have two shells hinged together. These species are often called bivalves in reference to the pair of shells which are also referred to as valves. The third group, the chitons, has eight overlapping plates arranged in a row.