Merismopedia

This species could also be, "Crucigenia rectangularis".

merismopedia
According to Aids to the Recognition of Fresh-Water Algae, Invertebrates, and Fishes which John (BCC) has given me, the closest match to this little phytoplankton, is Merismopedia.
merismopedia

merismopedia
Arrows point toward tiny merismopedia, three of which set beside a grain of sand magnified about 100x.

More photos of Merismopedia

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