Flying snails?

[DaPrawf]

I seem to have picked up some tiny snails as hitchhikers on my last set of plants (I knew I should have dipped them but got lazy). But here's the weird thing: I saw--but was unable to photograph--some of them swimming in open water by flapping their shells like wings. They looked just like sea Butterfly snails (Limacina helicina). Any idea what I'm dealing with?

[lefty o]

small snails can. seems like they can get an air bubble in the shell to help them float. i could be wrong on how it happens, but yours arent the first to swim.