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Int J Syst Evol Microbiol. 2020 Mar;70(3):1751-1757. doi: 10.1099/ijsem.0.003966. Epub 2020 Jan 14.

Urechidicola croceus gen. nov., sp. nov., a member of the family Flavobacteriaceae.

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Institute for Biomaterials, Korea University, Seoul, Republic of Korea.
School of Biosystem and Biomedical Science, Korea University, Seoul, Republic of Korea.
Department of Public Health Sciences, Graduate School, Korea University, Seoul, Republic of Korea.


A Gram-stain-negative, rod-shaped, non-flagellated, non-gliding, aerobic bacterial strain, designated LPB0138T, was isolated from a marine spoon worm (Urechis unicinctus). The strain LPB0138T contains a circular chromosome of 3.43 Mb with a DNA G+C content of 30.4 mol%. The genome includes 2987 protein-coding genes and two copies of rRNA operons. The 16S rRNA gene sequence analysis showed that the isolate occurred within a clade containing only members of the family Flavobacteriaceae. The highest sequence similarity was observed with the genus Lutibacter (93.0-94.3 %), but the phylogenetic leaf of the new isolate did not belong to any of the genera known in the family Flavobacteriaceae. The low sequence similarity and the phylogenetic tree topology implied the novel generic status of the new isolate. The phenotypic properties of the strain LPB0138T also differentiated this isolate from its neighbour genera by showing a distinctive fatty acid composition, unique polar lipids profile, and low DNA G+C content. The LPB0138T strain contained menaquinone 6 as the isoprenoid quinone; iso-C15 : 1 G, iso-C15 : 0, iso-C15 : 0 3-OH, and iso-C17 : 0 3-OH as the major fatty acids; and phosphatidylethanolamine, unidentified aminophospholipids, unidentified aminolipids, and unidentified lipids as the major polar lipids. Based on the polyphasic taxonomic data obtained, the LPB0138T strain is considered to represent a novel species in a novel genus of the family Flavobacteriaceae, for which the name Urechidicola croceus gen. nov., sp. nov. was proposed. The type strain is LPB0138T (=KACC 18889T;=JCM 31563T).


Flavobacteriaceae; Urechidicola; Urechis unicinctus; spoon worm


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