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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.
Mollusks. Maybe you think that snails, clams, mussels, squid, and octopods are very different. Yet, they are all in the same category of animals known as mollusks and are structurally similar. Mollusks are some of the most well known of invertebrate sea creatures (there are over 50,000 species). Some are very rare and are only found in very deep-water. Mollusks have three body regions. 1. The head contains the brain and the sense organs. 2. The visceral mass contains the internal organs. 3. The foot is the muscular part of the body. Mollusks usually, but not always, have a shell, which is secreted by a body wall called the mantle. Many mollusks have a tongue of sorts, called a radula. The radula is rough like sandpaper. Mollusks have well developed body organs that are used in the respiratory, circulatory and nervous systems. The Stomach-Foot The stomach-foots (class Gastropoda) contains about 70% of all mollusk species.