Need help identifying snail

[beefstrudel]

I found these snails over a year ago in northern Kentucky in a river at a public park. so i took a few and threw them in my danio tank to see what would happen. I just want to know what they are and I've finally been able to get a good picture

heres a link to google drive for high resolution: https://docs.google.com/file/d/0B9FuK7g1dBb3cHNfTjdtMnhsQVU

 

[shellyx]

Maybe some kind of trapdoor snail?

Sent from my GT-I9300 using Aquarium Advice mobile app

 

[limnologist]

Rehderiella parva?​