Glaucocystis

About

The glaucophytes, also known as glaucocystophytes or glaucocystids, are a small group of unicellular algae found in freshwater and moist terrestrial environments, less common today than they were during the Proterozoic. The stated number of species in the group varies from about 14 to 26. Together with the much larger sister taxa Rhodophyta and Viridiplantae/Chloroplastida, they form the primary algae clade Archaeplastida.

Summary from Wikipedia