with an external shell big enough that the soft parts can withdraw completely into it. those gastropods without a shell, and those with only a very reduced or internal shell, are usually known as slugs; those with a shell into which they can partly but not completely withdraw are termed semi-slugs....
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streaming rivers. this is reflected in their neritoid shape (less resitance) and strong, thick shell. snails with large and fragile shells won't survive the conditions in this environment. species felipponea elongata (dall, ) felipponea iheringi (pilsbry, ) felipponea neritiformis (dall, ) felipponea...
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