Oh, and I don't have a lot of ramshorns in my tank- but I have occassionally seen one with a sideways shell.
Never thought that was a seperate species- just assumed it was one holding it's shell funny.
My favourite ex-ramshorn "Goldy"- a gold one with a gold and red foot used to hold his shell at a 45 degree angle much of the time- not straight or sideways... but he could, and would hold it straight much of the time too- so I know it wasn't stuck at 45 degrees. Don't know what happened to Goldy- he disappeared shortly after I got Ghost Shrimp- I suspect he was dinner!
I don't know if they're a different species or just the same who happen to hold their shells funny- if they're small they could be juvenile and the low muscle to turn shell theory could be correct.
Does anyone have any sideways rams in a tank with no normal rams? If not- I wonder if they're the same thing.
They are definitely NOT the same thing. The shell orientation is not only different, but the shape is completely different. I had them for months and months before I got any regular ramshorns, and had a lot of time to observe them.
Kristina