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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 Class Gastropoda includes snails and slugs. Most gastropods have a single, usually spirally coiled shell, but the shell is lost or reduced in some groups. Many snails have an operculum, a plate that closes the gastropod's opening.Shelled gastropods have mantles, while those without shells have reduced to absent mantles. Gastropods have a muscular foot used for creeping in most species. In some, the foot is modified for swimming or burrowing.Most gastropods have a well-developed head that includes eyes at the end of one to two pairs of tentacles.any snails have an operculum, a plate that closes the gastropod's opening. Shelled gastropods have mantles, while those without shells have reduced to absent mantles. Gastropods have a muscular foot used for creeping in most species. In some, the foot is modified for swimming or burrowing.