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Cellulomonas algicola KZ-21T was compared with Cellulomonas aurantiaca THG-SMD2.3T to examine the taxonomic relationship between the two type strains. The 16S rRNA gene sequence of Cellulomonas algicola KZ-21T shared complete similarity (100.0 %) with that of Cellulomonas aurantiaca THG-SMD2.3T. The results of phylogenetic analyses based on 16S rRNA gene sequences indicated that the two strains formed a tight cluster within the genus Cellulomonas . Genome comparison between the two strains revealed an average nucleotide identity of 99.2 % and a digital DNA–DNA hybridization estimate of 93.7±1.8 %, strongly indicating that the two strains belong to a single species. In addition, neither strain displayed any striking differences in metabolic, physiological or chemotaxonomic features. Therefore, we propose Cellulomonas aurantiaca as a later heterotypic synonym of Cellulomonas algicola .