that looks nothing like a common pond snail... unless they start to look like that after getting bigger than the max size of .2in that i see in my tanks... i dont know what that one is that is picutured tho...
good snails for eating algae but not plants would be MTS snails, Ramshorn, or pond snails, they are also a good indicator of if your overfeeding or not, as their populations will explode if you over feed, and decline if you feed correctly