A genus of diatoms, which are single-celled algae with silica shells, commonly found in freshwater environments.
From Latin fragilis (fragile, breakable) + -aria (relating to). Named for the delicate, easily-broken silica shells of these microscopic organisms.
Fragilaria diatoms have shells made of pure glass (silica), yet they're invisible to the naked eye—they're nature's microscopic glass sculptures, which is why they're called 'fragile' despite being rock-hard.
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