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Antisera prepared against the purified transaldolases of five species of Bijido- bacterium were used to establish natural relationships among the 21 species that presently comprise this genus. The degree of phylogenetic relatedness among the respective members of this genus was estimated from the results of qualitative and quantitative immunological procedures in which the enzymes served as an evolutionary marker. The results are presented in the form of a phylogenetic dendrogram. In a previous immunological study, the en- zyme transaldolase (EC 2.2.1.2) was used as an evolutionary reference point to establish natural relationships among 21 species of B$dobacteri- um (10, 11). With antisera prepared against the transaldolases from B. thermophilum, B. cuni- culi, and B. minimum, some degree of immuno- logical homology was demonstrated with the transaldolases of all 21 species. Extensive paired comparisons on immunodiffusion plates indicat- ed that the 21 Bijidobacterium species could be assigned to eight major immunological specific- ity groups (antigenic groups A through H). Quantitative immunological data obtained by microcomplement fixation studies generally sup- ported the divisions within the genus based on

Demonstration of Phylogenetic Relatedness Among Members of the Genus Bifidobacterium by Means of the Enzyme Transaldolase as an Evolutionary Marker