How many freshwater jellies?

[Blue Crab of PAIN!!!!]

Whenever you look up "freshwater jellyfish" the first, and only thing that usually comes up is "Craspedacusta sowerbyi". For that reason I thought that was the ONLY type of freshwater "jelly" around (its actually a hydroid) but in my quest to find out what kind of jellyfish I saw at the petstore was (thread about that in the marine section) I encountered this guy

"Breede River Jellyfish".
http://www.environmentalgraffiti.com/news-most-beautiful-jellyfish-earth

This species doesn't even have a scientific name. I have never seen or heard of anything like this before. Does anyone here know anything more about any other types of freshwater jellies?

 

[knifegill]

They exist locally but the conditions required to promote the adult form's presence are not fully understood. I know nothing about the jelly you ask of, just that I looked into it and it seems to be a short-term deal for the most part even with moderately good care.