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Six Gram-stain-negative, aerobic, rod-shaped, and motile by gliding bacterial strains were isolated from Pacific green and red algae. Phylogenetic analysis based on 16S rRNA gene sequences placed the novel strains into the genus Zobellia as a distinct evolutionary lineage close to Zobellia nedashkovskayae Asnod2-B07-BT and Zobellia laminariae KMM 3676T sharing the highest similarity of 99.7% and 99.5%, respectively. The average nucleotide identity and the average amino acid identity values between strains 36-CHABK-3-33T and Z. nedashkovskayae Asnod2-B07-BT and Z. laminariae KMM 3676T were 89.7%/92.9% and 94.2%/95.8%, respectively. The digital DNA–DNA hybridization values based on the draft genomes between strains 36-CHABK-3-33T and Z. nedashovskayae Asnod2-B07-BT and Z. laminariae KMM 3676T were 39.5 ± 2.5% and 59.6 ± 2.7%, respectively. Multilocus sequence analysis based on house-keeping genes (dnaK, gyrB, pyrH, recA and topA) assigned the alga-associated isolates to the same species, which clustered separately from the recognized species of the genus Zobellia. The strains under study grew at 4–32 °C and with 0.5–8% NaCl and decomposed aesculin, gelatin, DNA, and Tweens 20 and 80, and weakly agar. The DNA G+C content was 36.7% calculated from genome sequence analysis for the strain 36-CHABK-3-33T. The predominant fatty acids of strain 36-CHABK-3-33T (&gt;5% of the total fatty acids) were iso-C17:0 3-OH, summed feature 3 (comprising C16:1ω7c and/or iso-C15:0 2-OH fatty acids), iso-C15:0, iso-C15:1 G, and C15:0. The major polar lipids were phosphatidylethanolamine, three unidentified lipids, and two unidentified aminolipids. The only detected respiratory quinone was MK-6. The significant molecular distinctiveness between the novel isolates and their nearest neighbor was strongly supported by differences in physiological and biochemical tests. Therefore, the six novel strains represent a novel species of the genus Zobellia, for which the name Zobellia barbeyronii sp. nov. is proposed. The type strain is 36-CHABK-3-33T (= KACC 21790T = KMM 6746T).

diversity

Zobellia barbeyronii sp. nov., a New Member of the Family Flavobacteriaceae, Isolated from Seaweed, and Emended Description of the Species Z. amurskyensis, Z. laminariae, Z. russellii and Z. uliginosa