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Description of Fabibacter halotolerans gen. nov., sp. nov. and Roseivirga spongicola sp. nov., and reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov.

¹ Coastal Marine Laboratory/Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR
² Department of Biology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR
³ Center for Marine Science, University of North Carolina at Wilmington, Wilmington, NC, USA

Correspondence
Pei-Yuan Qian
boqianpy{at}ust.hk

Bacterial strains UST030701-097^T and UST030701-084^T were isolated from a marine sponge in the Bahamas. Both strains were pink-pigmented, Gram-negative, strictly aerobic and chemo-organotrophic. Cells of strain UST030701-097^T were short, curved rods with fast-gliding motility, whereas those of strain UST030701-084^T were straight rods with a less rapid gliding motion. The two strains had MK-7 as the major respiratory quinone and did not produce flexirubin-type pigments. The DNA G+C contents of strains UST030701-097^T and UST030701-084^T were 42.5 and 43.7 mol%, respectively. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the two strains belonged to the family ‘Flexibacteraceae’ of the phylum Bacteroidetes. 16S rRNA gene sequence similarity between strains UST030701-097^T and UST030701-084^T was 95.0 %; their closest relative was [Marinicola] seohaensis, with 93.3 % and 96.0 % sequence similarity, respectively. Phylogenetic tree topology indicated that the two strains belonged to the same lineage, but were on separate branches. Whilst strain UST030701-084^T and [Marinicola] seohaensis were found on one branch, strain UST030701-097^T was in another branch that had no species with validly published names. Based on the polyphasic taxonomic data obtained in the present study, we propose that strain UST030701-097^T represents a novel genus and that strain UST030701-084^T represents a novel species in the phylum Bacteroidetes. The genus Fabibacter gen. nov. is proposed, with strain UST030701-097^T (=NRRL B-41220^T=JCM 13334^T) as the type strain of the type species, Fabibacter halotolerans sp. nov. Strain UST030701-084^T (=NRRL B-41219^T=JCM 13337^T) is proposed as the type strain of Roseivirga spongicola sp. nov. In an earlier study, it was suggested that the genus Marinicola is a later heterotypic synonym of the genus Roseivirga. However, a formal proposal to reclassify [Marinicola] seohaensis, the only member of the genus Marinicola, has not yet been made. The results of phylogenetic analyses in this study support the reclassification of [Marinicola] seohaensis as Roseivirga seohaensis comb. nov.

Tables detailing the results of API 20E, 20NE and 50CH tests and MicroLog 3 tests for strains UST030701-097^T and UST030701-084^T and scanning electron micrographs of cells of the two strains are available as supplementary material in IJSEM Online.

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