A genus of colorless sulfur bacteria found in aquatic environments that oxidize hydrogen sulfide without photosynthesis.
From 'achromat-' (colorless) + '-ium' (genus-forming Latin suffix). Named in microbiology in the late 1800s when scientists classified these unusual bacteria.
Achromatium bacteria are giants in the microbial world—up to 5 micrometers across when most bacteria are invisible. They hide in mud and survive by eating hydrogen sulfide, making them some of Earth's oldest-style life forms!
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