As apple snails are only a small part of the snail species that inhabit aquaria and ponds around the world, thus some basic information on other common freshwater snails cannot be left away.
This overview is by no means complete and it is therefore advised to take a look at other websites as well to gather more specific information (see link section) as well. Remarks, suggestions or questions about this section (or other sections) can be send to the author by using the question form.

Here is a small guide to facilitate to determination of your aquarium freshwater snails.
Please bear in mind that this guide is by no means complete. It's only intended to give a rough overview to help you in the right direction. For more specific information, you should use more specialized literature.   

  Determination guide
for common freshwater snails

Cup-shaped shell without whorls:

  Shell thin and transparant, less then 8mm. --> Acroloxidae Shell think and heavy, with colourful pattern at the outside. --> Septaria (Neritidae) Shell without colour pattern, medium thick, relatively high shell. - ...

Continue to read all article at : http://www.applesnail.net/content/snails_various.php