Diatoms.Their size is a wide range amongst species ca 5 - 500 µm
You can find them attached to plants, or plantonic. They often form brown crusts on surfaces under water (example: stones, plant stems).
Diatoms have silica shells in two halves that fit together. The shell (the frustule) often has very fine structure (which is best seen in commercially prepared slides of diatoms).
Classification :Kingdom - Protoctista, Phylum - Diatoms (Bacillariophyta)
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