What snail is it?

[Lilium]

I was wondering what type of snail this is.
http://img21.imageshack.us/img21/5449/snailwhat.jpg
It's a really really small snail with a spiral shell kind of like a ramshorn, but it tends to hold the shell parallel to the surface it's sitting on, and I don't think it gets any bigger.
The biggest white dot on the top left is a water flea, I think, for size reference. It may be 1/4 or 1/3 the diameter of a dime. It's probably as thin as a dime too.

[Wild Turkey]

Looks like a ramshorn to me.

http://www.sydneycichlid.com/gallery/d/115-3/ramshorn-red-a
http://badmanstropicalfish.com/articles/snail/RedRamshorn.jpg

[troy]

I agree that it's a ramshorn. I've got those in my tanks.

[rich311k]

That is a ramshorn.

[Lilium]

I have ramshorns in another tank, and they're much, much bigger than the little thing. Unless it's another type. I didn't think they were this small.
And it looks nothing like a baby ramshorn either.

But maybe it is just an extremely small type of ramshorn.