Marine strains of multiply appendaged prosthecate bacteria have been isolated. All three strains included in this study have characteristics that are typical of the genus . The deoxyribonucleic acid base compositions of the strains tested range from 66 to 67 mol% guanine plus cytosine; these values are similar to the value reported for However, the new strains which we studied differ from Prosthecomicrobium enhydrum because of their marine origin, immotility, requirement for a minimum salinity for growth of 5%, and lack of colony pigmentation. The marine strains have an absolute sodium ion requirement for growth, which is consistent with their being indigenous to marine environments. A new species, , is proposed.


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