Copyright Jellyfish picture by the US Geological Survey
Freshwater jellyfish
 are found in Alabama.

Bryozoan photograph by Graves Lovell
Bryozoans
are actually a colony of invertebrates.
Anthony River Snail
 Alabama has more species of aquatic snails than any other state.
Alabama Lampmussel
Alabama has more species of mussels than any other state 
Mollusks - Snails and freshwater mussels in Alabama.
  Copyright picture of Cambarellus shufeldtii by Chris Lukhap
Alabama has more species of crayfish than any other state.
Copyright photo by Chris Lukhaup