Descriptions of Roseiconus nitratireducens gen. nov. sp. nov. and Roseiconus lacunae sp. nov.

Two pink-coloured, oxidase-catalase-positive, salt and alkali-tolerant planctomycetal strains (JC635 and JC645) with pear to spherical-shaped, Gram-stain-negative, motile cells were isolated from Chilika lagoon, India. Both strains share highest 16S rRNA gene sequence identity with members of the genus Rhodopirellula (< 94%) and Roseimaritima (< 94%) of the family Pirellulaceae. The 16S rRNA sequence identity between the strains JC635 and JC645 is 96.1%. Respiratory quinone for both strains is MK6. Major fatty acids are Cω9c and C. Major polar lipids are phosphatidylethanolamine, phosphatidylcholine, unidentified amino lipids and an unidentified lipid. The genomic size of strain JC635 and JC645 are 7.95 Mb and 8.2 Mb with DNA G + C content of 55.1 and 60.0 mol%, respectively. Based on phylogenetic, genomic (ANI, AAI, POCP, dDDH), chemotaxonomic, physiological and biochemical characteristics, we conclude that both strains belong to a novel genus Roseiconus gen. nov. and constitute two novel species for which we propose the names Roseiconus nitratireducens sp. nov. and Roseiconus lacunae sp. nov. The two novel species are represented by the type strains JC645 (= KCTC 72174 = NBRC 113879) and JC635 (= KCTC 72164 = NBRC 113875), respectively.