Fourteen human periodontal isolates recovered from a purported -selective medium containing 1 μg of clindamycin per ml displayed biochemical traits which differed from those described for . These organisms were gram-negative rods which corroded agar. The isolates were oxidase positive and urease, indole, and esculin negative. They differed from in catalase, nitrate reduction, lysine decarboxylase, and ornithine decarboxylase activities. One isolate, strain UB-294, was presumptively identified as . A second isolate, strain UB-204, differed from by being catalase positive and nitrate reduction negative. Twelve isolates, including strain UB-38 (T = type strain), were phenotypically similar to except that they did not produce acid from maltose and were not beta-hemolytic. Essentially complete (1,480-base) 16S rRNA sequences were determined for strains UB-38, UB-204, and UB-294 and the type strains of , and . These sequences were compared with the previously published sequences of six other species belonging to the family . On the basis of the results of the comparative sequence analysis, UB-294 was confirmed as a strain, UB-204 was identified as a member of a new species which may belong in the genus , and UB-38 was identified as a member of a new species of the genus , for which we propose the name . Since strain UB-204 was the only representative of a new species, it was not named. DNA probes for identification of , and based on 16S rRNA sequence information are described.


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