Marinibactrum halimedae gen. nov., sp. nov., a gammaproteobacterium isolated from a marine macroalga

Sessilibacter corallicola gen. nov., sp. nov., a sessile bacterium isolated from coral Porites lutea

A Gram-stain-negative, non-spore-forming, motile, aerobic bacterium (strain C21T) was isolated from coral and identified using polyphasic identification approach. Global alignment of 16S rRNA gene sequences indicated that strain C21T shares 95.7 % sequence identity to its closest neighbour, Marinibactrum halimedae NBRC 110095T, followed by other type strains with identities of lower than 95 %. The average nucleotide identity and average amino acid identity values between strain C21T and M. halimedae NBRC 110095T were 69.6 and 64.8 %, respectively, indicating that strain C21T may represent a new species in a new genus. Phylogenetic analysis based on 16S rRNA gene and phylogenomic results indicated that strain C21T forms a distinct branch in the family Cellvibrionaceae. Cellular fatty acids and polar lipids could also readily distinguish strain C21T from closely related type strains. Therefore, strain C21T is suggested to represent a new species in a new genus, for which the name Sessilibacter corallicola gen. nov., sp. nov. is proposed. The type strain is C21T (=MCCC 1K03260T=KCTC 62317T).

Exilibacterium tricleocarpae gen. nov., sp. nov., a marine bacterium from coralline algae Tricleocarpa sp

A Gram-stain-negative, non-spore-forming, aerobic, curved rod-shaped bacterium, designed strain R142^T, was isolated from a coralline algae Tricleocarpa sp. in the Beibu Gulf, China. Optimal growth occurred with 0-0.5 % (w/v) NaCl, at 25 °C and at pH 8. Global alignment based on 16S rRNA gene sequences indicated that strain R142^T shared 93.8 % similarity with its closest type strain, Pseudomaricurvus alkylphenolicus KU14G^T. Phylogenetic analyses showed that strain R142^T forms a distinct branch alongside Maricurvus nonylphenolicus KU41E^T, Pseudoteredinibacter isoporae SW-11^T, Pseudomaricurvus alkylphenolicus KU14G^T, Pseudomaricurvus alcaniphilus MEBiC06469^T and Aestuariicella hydrocarbonica SM-6^T. The major polar lipids of strain R142^T were phosphatidylethanolamine and phosphatidylglycerol. The primary cellular fatty acids were C_16 : 0, C_16 : 1ω7c, C_18 : 1ω7c, C_18 : 0 and C_14 : 0. The genome DNA G+C ratio was 56.4 mol%. The only detected respiratory quinone was ubiquinone 8. The low 16S rRNA gene sequence similarity and differences in cellular fatty acids readily distinguished strain R142^T from all validly published type strains. Strain R142^T is therefore suggested to represent a novel species of a new genus, for which the name Exilibacterium tricleocarpae gen. nov., sp. nov. is proposed. The type strain of Exilibacterium tricleocarpae is R142^T (=MCCC 1K03816^T=KCTC 72138^T).