It could be either a viviparus viviparus or a viviparus georgianus, which are native to your region. tough to say. I have V. viviparus, they're charming little snails. Most likely they won't eat your plants - mine graze all over the tank, seem to enjoy gnawing on my driftwood and any algae that grows. They occasionally eat some of the veggies i put in for the others.
They will not eat smaller snails. They're very friendly and will clean the shells of any other snails you have. Charming little livebearers. You can try to sex them if you like - I just posted a thread on how to sex V. malleatus, a very similar species.
