So... I am from the US. I live in Mississippi near Pickwick lake. Well... I've always saw what I considered a pond snail at the river... (though we do have the normal pond snail) the ones I am talking about, I can't seem to find on the internet anywhere.. they have the trumpet shape. Though they are not rippled or twisted. Just a smooth come shape.... any idea?! I could possible get pictures of just the shells. Because I have those in my tanks.... just curious what they are really called.