A genus of small circular diatoms (single-celled algae with glass-like shells) commonly found in freshwater and marine environments worldwide.
From Greek 'kyklos' (circle) + Latin '-tella' (diminutive suffix), literally meaning 'little circle,' describing the disk-shaped appearance of these microscopic organisms.
Cyclotella diatoms are so abundant in lakes and oceans that they're used as indicators of water quality and environmental change—scientists use their fossils to read Earth's climate history.
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