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Thermocrinis, a filamentous prokaryote that occurs in the same habitats as Thermus. Image courtesy of the National Park Service.
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Hydrogenobaculum is a thermophilic archaebacterium that forms long, creamy streamers in the 70 degrees C, acidic water of Nymph Creek.
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Hydrogenobaculum, with inorganic material (mostly sulfur) deposited around the filaments.
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Hydrogenobaculum forms thin white filaments at Mammoth Springs.
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Sulfur deposits can be seen among the filaments formed by Hydrogenobaculum.
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Hydrogenobaculum usually is found in the form of filaments, but short motile rods may occur.