Two new species of aerobic, gram-negative, peritrichously flagellated or nonmotile marine bacteria usually forming star-shaped aggregates were isolated from northeastern Atlantic Ocean bottom sediments. These organisms resembled eight star-shaped-aggregate-forming bacterial species from the Baltic Sea originally ascribed to the genus but not included on the because of their questionable relationships to true agrobacteria. These two sets of star-shaped-aggregate-forming bacteria were compared by means of phenotypic data, DNA base compositions, DNA-DNA relatedness, and one-dimensional electrophoretic analysis of low-molecular-weight RNAs (5S rRNA and tRNA). According to the results of genotyping, the northeastern Atlantic Ocean isolates and three of the Baltic Sea species formed a group of closely related bacteria that could not be excluded from the genus with certainty. Until more genotypic data are available, these five marine species are regarded as a distinct subdivision of the genus consisting of sp. nov. (type strain, 1480 = DSM 5823), sp. nov. (type strain, 1513 = DSM 5824), sp. nov. nom. rev. emend. (type strain, ATCC 25652), sp. nov. nom. rev. emend. (type strain, ATCC 25655), and sp. nov. nom. rev. emend, (type strain, ATCC 15215). “” proved to be a later subjective synonym of , which had priority. The remaining four Baltic Sea species, “,” and “,” could not be placed in the new subdivision of .


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