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...generally present; sexes separate; shell can usually hold entire animal; primarily marine, several freshwater and terrestrial groups; about 33,000 species.
There are two kidneys, or nephridia, in primitive gastropods, such as the archaeogastropods, while, in the advanced forms, one kidney is small or lost. The kidney plays different roles, depending upon the environment in which the snail lives. Most marine gastropods have the same total concentrations of solutes as in the surrounding seawater, and thus a small osmotic differential ( i.e.,...
...The different structural aspects of the radula in caudofoveates, solenogasters, and gastropods serve in classification. The differentiation of a more flexible radular structure among the primitive archaeogastropods subsequently enabled successful radiation into diverse habitats.
Evidently, the most primitive type of gastropod feeding involved browsing and grazing of algae from rocks. Some species of the order Archaeogastropoda still retain the basic rhipidoglossan radula, in which many slender marginal teeth are arranged in transverse rows. During use, the outer, or marginal, denticles swing outward, and the radula is curled under the anterior end of the odontophore....
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