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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.
Body Plan. Mollusks have a thin layer of tissue called the mantle. The mantle covers the body organs, which are located in the visceral mass. Between the soft body and the mantle is a space called the mantle cavity. Mollusks contain gills.Gills are organs in which carbon dioxide from the mollusk is exchanged for oxygen in the water. The mantle also protects the body if the mollusk does not have a shell. the shell is made up of several layers.he mantle covers the body organs, which are located in the visceral mass. Between the soft body and the mantle is a space called the mantle cavity. Mollusks contain gills. Gills are organs in which carbon dioxide from the mollusk is exchanged for oxygen in the water.