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A Gram-stain-negative, rod-shaped, non-flagellated, non-gliding, aerobic bacterial strain, designated LPB0138 T , was isolated from a marine spoon worm ( Urechis unicinctus ). The strain LPB0138 T 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 LPB0138 T 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 LPB0138 T strain contained menaquinone 6 as the isoprenoid quinone; iso-C 15 : 1 G, iso-C 15 : 0 , iso-C 15 : 0 3-OH, and iso-C 17 : 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 LPB0138 T 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 LPB0138 T (=KACC 18889 T ;=JCM 31563 T ).