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A novel Gram-staining negative, strictly aerobic, rod-shaped, and non-motile bacterium, designated strain 10Alg 79^T, was isolated from the red alga <i>Ahnfeltia tobuchiensis</i>. A phylogenetic analysis based on 16S rRNA gene sequences placed the novel strain within the family <i>Roseobacteraceae</i>, class <i>Alphaproteobacteria</i>, phylum <i>Pseudomonadota</i>, where the nearest neighbor was <i>Shimia sediminis</i> ZQ172^T (97.33% of identity). However, a phylogenomic study clearly showed that strain 10Alg 79^T forms a distinct evolutionary lineage at the genus level within the family <i>Roseobacteraceae</i> combining with strains <i>Aquicoccus porphyridii</i> L1 8-17^T, <i>Marimonas arenosa</i> KCTC 52189^T, and <i>Lentibacter algarum</i> DSM 24677^T. The ANI, AAI, and dDDH values between them were 75.63–78.15%, 67.41–73.08%, and 18.8–19.8%, respectively. The genome comprises 3,754,741 bp with a DNA GC content of 62.1 mol%. The prevalent fatty acids of strain 10Alg 79^T were C_{18:1 ω7c} and C_16:0. The polar lipid profile consisted of phosphatidylethanolamine, phosphatidylglycerol, phosphatidylcholine, an unidentified aminolipid, an unidentified phospholipid and an unidentified lipid. A pan-genome analysis showed that the unique part of the 10Alg 79^T genome consists of 13 genus-specific clusters and 413 singletons. The annotated singletons were more often related to transport protein systems, transcriptional regulators, and enzymes. A functional annotation of the draft genome sequence revealed that this bacterium could be a source of a new phosphorylase, which may be used for phosphoglycoside synthesis. A combination of the genotypic and phenotypic data showed that the bacterial isolate represents a novel species and a novel genus, for which the name <i>Rhodoalgimonas zhirmunskyi</i> gen. nov., sp. nov. is proposed. The type strain is 10Alg 79^T (=KCTC 72611^T = KMM 6723^T).