Four strains of tetrodotoxin-producing bacteria isolated from a red alga and from pufferfish were characterized. Two of these strains are members of the genus MacDonell and Colwell. The phenotypic characteristics, guanine-plus-cytosine contents, and base sequences of the 16S rRNAs of these organisms indicated that they are members of biovar II. The other two strains are members of the genus Baumann et al. and the genus MacDonell and Colwell. These two strains are mutually distinct and distinct from the previously described and species and therefore are placed in new species. The names and are proposed for these organisms; the type strains are strains OK-1 and GFC, respectively.


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