Diatoms.
{A major group of algae and one of the most common types of phytoplankton}
Most types of Spirilla are harmless except for Spirillum minor, which causes rat bite fever.
Many microbiologists believe we are still far from having a complete assessement of the bacterial world, mostly because the world is so large and bacteria are so small.
Floating purple mats are huge masses of purple sulfur bacteria blooming in the Baltic Sea. (I want that.)
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