Prosthecomicrobium litoralum, a New Species from Marine Habitats

Abstract
Marine strains of multiply appendaged prosthecate bacteria were isolated. All 3 strains included in this study have characteristics that are typical of the genus Prosthecomicrobium. The DNA base compositions of the strains tested range from 66-67 mol% guanine plus cytosine; these values are similar to the value reported for P. enhydrum. The new strains studied differ from P. enhydrum because of their marine origin, immotility, requirement for a minimum salinity for growth of 5.permill. and lack of colony pigmentation. The marine strains have an absolute Na ion requirement for growth, which is consistent with their being indigenous to marine environments. A new species, P. litoralum, is proposed.

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