Five strains of bacteria causing nocardiosis in cultured fishes (yellowtails [] and Japanese flounder []) were studied to establish their taxonomic status. Well-developed fragmenting vegetative mycelium was observed. The chemotype was type IVA containing -diaminopimelic acid, arabinose, and galactose. The predominant isoprenoid quinone was MK-8(H), and mycolic acids were present. These morphological and chemical properties are characteristic of the genus . The physiological and biochemical characteristics were most similar to those of ; however, these organisms were different in their decomposition of urea, growth temperature, utilization of nitrogen sources, survival at 50°C for 8 h, mycolic and fatty acid profiles, and deoxyribonucleic acid-deoxyribonucleic acid hybridization characteristics. Therefore, we propose a new species for these strains, . The type strain is strain JCM 3360.


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