The genetic and phenotypic properties of 18 strains which were considered to be or related organisms were examined. These strains were differentiated into several groups on the basis of deoxyribonucleic acid homology, physiological properties, guanine-plus-cytosine content of the deoxyribonucleic acid, and electrophoretic patterns of cell proteins. The groups were considered to constitute separate species. Strains of group I (strains VPI 7570A, WAL 3030, and 1221) belonged to the newly described species . Strain VPI 8906D (group II) has been designated a new species, , by Shah and Collins. Strain VPI D27B-24 (group III) is the type strain of . However, the biological properties of none of the three groups described above fit the original description of (Loesche et al. 1964). Strain VPI D22A-7 did not belong to any of the three groups but had phenotypic properties that matched the phenotypic properties given in the first description of . We propose the name for this organism and have deposited strain VPI D22A-7 in the American Type Culture Collection (= ATCC 33779) as the type strain.


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