RT Journal Article SR Electronic(1) A1 Lage, Olga Maria A1 Albuquerque, Luciana A1 Lobo-da Cunha, Alexandre A1 da Costa, Milton SYR 2017 T1 Mariniblastus fucicola gen. nov., sp. nov. a novel planctomycete associated with macroalgae JF International Journal of Systematic and Evolutionary Microbiology, VO 67 IS 5 SP 1571 OP 1576 DO https://doi.org/10.1099/ijsem.0.001760 PB Microbiology Society, SN 1466-5034, AB One strain of a novel genus and species of the order Planctomycetes , designated FC18T, was isolated from the epiphytic community of Fucusspiralis. This strain was non-pigmented in medium M13 but was slightly pink pigmented on medium M14, containing four-fold the levels of glucose, peptone and yeast extract of M13. The organism was primarily spherical, with unicellular non-motile forms and rosettes. The optimal temperature for growth was about 25 °C and the optimal pH was 7.5. FC18T was chemoorganotrophic and aerobic. Several sugars, polyols and amino acids were assimilated. The major fatty acids were C18 : 1ω9c, C14 : 0 and C16 : 0. The major polar lipids were phosphatidylglycerol (PG) and two unknown lipids. Menaquinone 5 (MK-5) was the main respiratory quinone, but MK-6 was also present. The results of the 16S rRNA gene sequence analysis confirmed the affiliation of this organism to the order Planctomycetales , family Planctomycetaceae , with Blastopirellula marina as the closest relative with only 86 % sequence similarity. On the basis of physiological, biochemical and chemotaxonomic characteristics we propose that FC18T(=LMG 29748T=DSM 26290T) represents a novel species of a novel genus of the family Planctomycetaceae for which we propose the name Mariniblastusfucicola gen. nov., sp. nov., UL https://www.microbiologyresearch.org/content/journal/ijsem/10.1099/ijsem.0.001760