Great reference material Vampie! I was actually going to make a side by side photo myself this weekend for comparison. The only difference in my guys to that of the picture is the transparent shell. But their faces with the big, thick antenna are just awesome.
I've found about 10 in the tank (if I can only figure out where they came from now..have to check my other tanks). They definately aren't as prolific as the bladder snails. They are growing fast. I have one that looks to be closing in on the 1" mark. Will definately continue watching their growth after seeing the 2-3" part.
On a side note....I still haven't seen any damage to the plants in the tank which is a great sign. They appear to only eat the decaying matter and of course any left over food from the shrimp.
I now have them (thanks Hollygirl!) I looked closely today at them, and then at the reference page. That's what they are. Very cute.
Can you post a pic of yours, James?
There's a link in one of the previous threads. I'll see if I can grab a couple more shots in a bit. Gettin ready to go work on that tank anyway. As long as I don't get eatn by them. Sounds like time for a youtube clip.