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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.
Cephalopods are unique among mollusks in having a closed circulatory system. Coleoids (squids, cuttlefish and octopuses) have a two gill hearts (that pump blood through the gills) and a third systemic heart (that pumps blood throughout the body).art of the mantle of a cephalopod forms a siphon through which water is forced. As the water pressure moves through the siphon, it forces the cephalopod forward and in this way produces jet propulsion. Cephalopods also use their tentacles to move and help maintain their velocity.