The morphological and biochemical attributes of two organisms, American Type Culture Collection (ATCC) strains 190 and 6627, originally identified as , were studied. The guanine-plus-cytosine content of the deoxyribonucleic acid of each strain is 60 mol%. The deoxyribonucleic acid homology between the two strains is 99%. The strains are quite similar phenotypically and genetically, and they are regarded here as belonging to one and the same species. Although the two strains produce pertucin, a bacteriocin active against strains in the smooth phase, they possess the characteristics of the genus as defined by Shewan and Haynes. However, ATCC 190 and 6627 could not be placed in any of the species described in the literature. Therefore, these strains are regarded as belonging to a new species, for which we propose the new name The type strain of is ATCC 190.


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