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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.
The most common examples for mollusks include snails, clams and squids. All mollusks have a thin outer layer called the mantle, which surrounds the body organs located insides the visceral mass. Mantle secretes the protective shell of the body. Gas exchange is taken place in gills.Mollusks have an open circulatory system in which the heart pumps blood into the open space around the body organs. They have a prominent head with a mouth and sensory organs. Mollusks like snails have a well-developed muscular foot for movement and adhesion.as exchange is taken place in gills. Mollusks have an open circulatory system in which the heart pumps blood into the open space around the body organs. They have a prominent head with a mouth and sensory organs. Mollusks like snails have a well-developed muscular foot for movement and adhesion.