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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.
Mollusks consist of a wide range of invertebrate animals, from snails to giant squids. A mollusk usually has a soft body that is covered with an exoskeleton, such as the shell of a clam. Just what sort of animal qualifies as a mollusk is up for debate, with some research classifying 50,000 species and others up to 200,000.