DNA reassociation was used to determine levels of relatedness among four thermophilic strains that are able to use formate and between these organisms and two representative strains of , strain ▵H (= DSM 1053 = ATCC 29096) (T = type strain) and strain Marburg (= DSM 2133). Three homology groups were delineated, and these groups coincided with the clusters identified by antigenic fingerprinting. The first group, which had levels of cross hybridization that ranged from 73 to 99%, included ▵H, Z-245, sp. strain THF, and sp. strain FTF. The second and third groups were each represented by only one strain, sp. strain CB-12 and Marburg, respectively (cross-hybridization levels, 13 to 30 and 29 to 33%, respectively). Our results indicate that the name should be rejected as it is a synonym of . The taxonomic positions of strains Marburg and CB-12 need further investigation.


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