Phylum: Cyanobacteria   Family: Microcystaceae

Merismopedia elegans A. Braun ex F.T. Kützing 1849

First described by Braun ex Kützing (1849: 472). Colonies can reach large proportions, sometimes up to 4000 cells.
Cell dimensions: L: 6-9 µm; B: 5-7 µm; Colony: 16-4000 cells.
Fairly common in freshwater and brackish waters.

References: 
Braun, A. [in] Kützing, F.T. (1849). Species algarum.