What are the characteristics of a gastropod?
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The shell of gastropods is of one piece (called univalve) and usually coiled or spiraled as in snails , periwinkles , conches , whelks , limpets , and abalones ; however, in some forms, as in slugs and sea slugs , it is reduced or completely absent. There is usually a definite head, bearing one or two sensory tentacles and a mouth that is often equipped with a rasplike tongue called a radula. The lower surface of the animal is modified into a large, flattened foot, used by bottom-dwelling forms for creeping about. The foot and other soft parts of the body can usually be completely withdrawn into the shell and the opening covered by a permanent plate called the operculum.
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