A Taxonomic Study of Flavobacterium spiritivorum and Sphingobacterium mizutae: Proposal of Flavobacterium yabuuchiae sp. nov. and Flavobacterium mizutaii comb. nov.

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Abstract
Seventeen strains corresponding to Flavobacterium spiritivorum, seven strains corresponding to or received as Sphingobacterium mizutae, and the type strains of Flavobacterium multivorum and Flavobacterium thalpophilum were examined for deoxyribonucleic acid-deoxyribonucleic acid relatedness. Duplicate cultures of the type strains and of some of the S. mizutae field strains, from various sources, were included to make a total of 43 cultures examined. Of the 17 F. spiritivorum strains, 15 could be included in that species, but 2 constituted a closely related, but separate, species. For this new species we propose the name Flavobacterium yabuuchiae, with strain F8081 (= NCTC 12113) as the type strain. Only three strains could be included in S. mizutae; of the four remaining strains, one represented a separate species 32% related to S. mizutae, one corresponded to Flavobacterium meningosepticum, and the classification of the other two was unresolved. The type strains of F. multivorum and F. thalpophilum were distinct from the other cultures studied. The new combination Flavobacterium mizutaii is also proposed.

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