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Spirillum
''Spirillum'' is a genus of Gram-negative bacteria within family Spirillaceae.〔Garrity, George M.; Brenner, Don J.; Krieg, Noel R.; Staley, James T. (eds.) (2005). Bergey's Manual of Systematic Bacteriology, Volume Two: The Proteobacteria, Part C: The Alpha-, Beta-, Delta-, and Epsilonproteobacteria. New York, New York: Springer. pp. 354–361. ISBN 978-0-387-24145-6.〕〔Podkopaeva (D.), Grabovich (M.), Kuever (J.), Lysenko (A.M.), Tourova (T.P.), Kolganova (T.V.) and Dubinia (G.): Proposal of Spirillum winogradskyi sp. nov., a novel microaerophilic species, an amended description of the genus Spirillum and Request for an Opinion regarding the status of the species Spirillum volutans Ehrenberg 1832. Int. J. Syst. Evol. Microbiol., 2009, 59, 2916-2920.〕 There are two species in ''Spirillum'' with standing in nomenclature, ''Spirillum winogradskyi'' and ''Spirillum volutans''. The taxonomic position of three other species provisionally bearing the ''Spirillum'' genus name (''Spirillum minus'', ''Spirillum pleomorphum'', and ''Spirillum pulli'') is uncertain and these have no standing in nomenclature.〔 ==Morphology== Members of ''Spirillum'' are large, elongate, spiral shaped, rigid cells.〔 Some have tufts of flagella at both poles. They are microaerophilic and usually found in stagnant freshwater rich in organic matter.〔
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