"donkey ear" pond snail ID?

I have a bunch of regular bladder snails, but lately I noticed that some of them looked decidedly bigger. I investigated more closely and found two that are definitely NOT bladder snails, and I grabbed a few snapshots of one of them. Based on the "donkey ears" and the right-spiraling shells, I'm guessing they're some kind of pond snail (Lymnaea), but they don't look like Great Pond Snails (Lymnaea stagnalis) and I can't seem to find much info on other kinds. Ideas?

I think they're cute and they don't seem to be eating my plants, so I'd like more of them. They're definitely way outnumbered by the bladder snails and I can't find any babies of this type. Do I need to do anything special to encourage them to get busy?

Thanks!

Thanks, vampie! I saw peregra mentioned in a few places and some of the photos were a pretty good match, but some weren't. It seemed that a couple of different kinds of snails were getting labeled with that species name and I wasn't sure who to trust. If that's the most common one, that's probably what I have though. They were hitchhikers along with the bladder snails.

They're getting way out-reproduced by the bladder snails. Anything I can do to encourage these to breed? (Or any reason I shouldn't?)

I found a third one this morning, larger than the other two, so I'm hopeful that they are indeed breeding.

EDIT: Should have said "smaller than the other two." Doh!

paperdragon said:

Yeah, I'm thinking peregra too.
It definitely doesn't look like the ones I have, which makes me even more inclined to thing I may have l. stagnalis.

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Congrats! Do keeps us posted on those.