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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.
List of mollusks: List of mollusks, Mollusks are soft-bodied invertebrates of the phylum Mollusca, usually wholly or partly enclosed in a calcium carbonate shell secreted by a soft mantle covering the body. Along with the insects and vertebrates, mollusks are one of the most diverse groups in the animal kingdom, with nearly 100,000 (possibly as many as 150,000) described species. This is a list of notable mollusks, ordered alphabetically by class. Also included are extinct mollusks. (See also index fossil.) class Aplacophora