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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.
Section 1 - Mollusks. Mollusks are invertebrates with soft, unsegmented bodies that are often protected by a hard outer shell. In addition to a soft body often covered by a shell, a mollusk has a thin layer of tissue called a mantle that covers its internal organs, and an organ called a foot.Mollusks have bilateral symmetry and a digestive system with two openings.Most species of mollusks have an open circulatory system, in which the blood is not always inside blood vessels. Most mollusks that live in water have gills, organs that allow oxygen from the water to enter the body.lams, oysters, scallops, and mussels are bivalves. Bivalves are mollusks that have two shells held together by hinges and strong muscles. Bivalves live in all kinds of watery environments. Bivalves do not have radulas.