The taxonomic and phylogenetic relationships of members of the order have been examined. On the basis of cellular and colony morphology, cell wall composition, fermentation products, and certain physiological characteristics, the taxa within the family were divided into two groups. Each group was closely related to members of the family one group consisted of , and (“hamster organism”). The second group consisted of and type II (). This latter organism was renamed nov. comb. because its morphological, physiological and beiochemcial characteristics related it to the members of both groups of trhe genus The families and appeared more closely related to the family than to the family than to the family . The use of the certain criteria for classification and determiniation of phylogenetic relationships was discussed. We have stressed those areas in which necessary information is lacking.


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