There are also fresh water sponges. The only one i know of is green, and looks more like some type of algae than a sponge. During rough times, it produces little white "beads" that protect sponge tissue within and when conditions are more favorable they open back up and start to regrow. We cant forget fresh water shrimp either:P Also some what of a type of coral. They are non moving cnidarians (hyrozoans, or something like that, ill fix spelling later because im about to go somewhere) They dont really form a skeleton, and are more of a soft coral type, but usually too small to be noticed. Gotta love general zoology
