Icecave Swarmer

The icecave swarmer split from its ancestor, the ice swarmer. Like it ancestor, it sucks on the ice filtering out the microbes. It also can still photosynthesize when it is exposed to light. They also still have their ancestor's special anti-freezing substance, which is stored inside its body while eating, so that the ice melts and the fresh water is sucked up by the swarmers. Since there were no predators and they move very little their tentacles and flippers have atrophied.