Onealgae

A white cell of the assimilation floralgae was ripped apart by a water current and it landed on Day Polar Beach. There the white cell adapted and it splits from its ancestor, evolving into onealgae. The onealgae uses only the black cells to photosynthesize. When some onealgaes found there way back to the Justin Polar Bay, populating that biomass as well. But the onealgae can't reproduce using assimilation cells as it doesn't have them anymore so it reproduces using mitosis only.