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An aerobic, Gram-negative, motile bacterium, strain C02T, was isolated from seawater obtained from Semarang Port in Indonesia. Cells of strain C02T were peritrichously flagellated and rod-shaped. Strain C02T was able to degrade naphthalene, alkylnaphthalenes and phenanthrene. 16S rRNA gene sequence analysis revealed that this strain was affiliated with the family Rhodobacteraceae in the class Alphaproteobacteria and was related most closely to Marinovum algicola FF3T (95.7 % similarity) and Thalassobius aestuarii JC2049T (95.2 %). The DNA G+C content of strain C02T was 64.6 mol%. The major cellular fatty acids were C18 : 1 ω7c (50.9 % of the total), C16 : 0 (17.9 %), 11 methyl C18 : 1 ω7c (14.7 %), C18 : 1 ω9c (2.9 %) and C19 : 0 cyclo ω8c (2.4 %), and the predominant respiratory lipoquinone was ubiquinone-10. Based on physiological, chemotaxonomic and phylogenetic data, strain C02T is suggested to represent a novel species of a new genus, for which the name Tropicibacter naphthalenivorans gen. nov., sp. nov. is proposed. The type strain of Tropicibacter naphthalenivorans is C02T (=JCM 14838T=DSM 19561T).
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