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| a genus of large, elongate, spiral-shaped, rigid, gram-negative bacteria, containing the species Spirillum winogradskyi and Spirillum volutans with standing in nomenclature ❲Spirillum❳ | |||
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| the type genus of the family Spirochaetaceae; the type genus of the family Spirochaetaceae; a bacterium that is flexible, undulating, and chiefly aquatic ❲Spirochaeta❳ |