Aureibaculum koreense sp. nov. and Aureibaculum conchae sp. nov., isolated from the marine molluscs

Facultative anaerobic Gram-negative bacteria, designated strains 2210JD6-5^T and 2308TA14-22^T, were isolated from a seashell and a marine conch, respectively, in the Republic of Korea, and subjected to detailed taxonomic analysis. The cells exhibited catalase and oxidase activity, were non-motile and were rod-shaped. Both novel strains were mesophilic, grew optimally at neutral pH and were slightly halophilic. Phylogenetic analyses based on 16S rRNA gene and whole-genome sequences demonstrated that strains 2210JD6-5^T and 2308TA14-22^T were affiliated with the genus <i>Aureibaculum</i>. The digital DNA-DNA hybridization and average nucleotide identity values between strains 2210JD6-5^T and 2308TA14-22^T and type strains of the most closely related species were below the cut-off thresholds. Both strains possessed DNA G+C contents of 33.5 mol%. The predominant cellular fatty acids and the sole respiratory quinone in these two strains were iso-C_{15 : 0}, iso-C_{15 : 1} G and iso-C_{17 : 0} 3-OH and MK-6, respectively. Strains 2210JD6-5^T and 2308TA14-22^T shared polar lipids, such as phosphoethanolamine, aminophospholipid, unidentified aminolipid and unidentified lipid. Based on phylogenetic, genomic relatedness and chemotaxonomic characteristics, strains 2210JD6-5^T and 2308TA14-22^T represent a novel species within the genus <i>Aureibaculum</i>, for which the names <i>Aureibaculum koreense</i> sp. nov. (2210JD6-5^T=KCTC 102167^T=JCM 37322^T) and <i>Aureibaculum conchae</i> sp. nov. (2308TA14-22^T=KCTC 102250^T=JCM 37321^T) are proposed.