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Bacterial strains were isolated from sponge and green algae which were collected on the coast of Japan and Palau. The phylogenetic relationships of these isolates among marine species of the Cytophaga-Flavobacterium-Bacteroides complex were analysed by using their gyrB nucleotide sequences and translated peptide sequences (GyrB) in addition to 16S rDNA sequences. These isolates were closely related to the previously characterized marine Flexibacter species, [Flexibacter] maritimus and [Flexibacter] ovolyticus. These Flexibacter species are distantly related to Flexibacter flexilis, the type species of the genus Flexibacter, and phylogenetically belong to the family Flavobacteriaceae (according to analysis using both 16S rDNA and GyrB sequences). Their phylogenetic, chemotaxonomic and phenotypic characteristics prompted the proposal that these two species should be transferred to the new genus …