A genus of photosynthetic cyanobacteria (blue-green algae) commonly found in freshwater and marine environments.
From Greek 'kalos' (beautiful) + 'thrix' (hair). Named for the hair-like filamentous structure of the organisms.
Calothrix cyanobacteria are some of the oldest organisms on Earth and literally created the oxygen in our atmosphere billions of years ago—they're the ancestors of modern plants!
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