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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.
For most mollusk, their shell is external including snails, scallops, oysters, clams and mussels. For other mollusk, like squid, and cuttlefish, they have a internal skeleton similarly to a shell. There are also some that do not have a shell at all, like octopus and slugs, with only a mantle for protection of organs.ollusks have a body without a cavity, has more than two layers of cell layers, tissues and organs. Mollusks are soft bodied animals with three main regions: head, visceral mass, and foot. The head of the mollusk contains the sense organs such as the brain. It has a pair of eyes, a mouth, sensory and nervous structures.