Hard to say. I've found some snails pretty much dessicated-looking and threw them back in and they recovered. And I've found snails dessicated-looking and threw them back in and they were.. well too far past. It basically depends on how long they are out of the water. They can look dry on the outside but not be dry on the inside.
Some snails species are intertidal and thus they will wander out of the tank like this. It's unfortunate. Eventually their luck will run out and you will find them too late. Nerites, Marguerites, as far as I know, are both intertidal. And I'm sure there are others commonly imported which are intertidal.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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