A motile, short rod-shaped and yellow-pigmented bacterium, designated strain CW5 T , was isolated from a water-cooling system at Gwangyang, Republic of Korea. Cells were Gram-negative, facultatively anaerobic and catalase-and oxidase-positive. The major fatty acids were C 18 : 1 v7c (64.7 %) and C 16 : 0 (14.1 %). The DNA G+C content was 63.9 mol%. A phylogenetic tree based on 16S rRNA gene sequence comparison showed that strain CW5 T clustered within the Aurantimonas lineage and is closely related to the type strains of Aurantimonas altamirensis (98.5 % sequence similarity) and Aurantimonas coralicida (95.7 %). The phenotypic characteristics and DNA-DNA hybridization data indicate that strain CW5 T could be distinguished from the phylogenetic relatives A. altamirensis and A. coralicida. On the basis of the evidence presented in this study, strain CW5 T represents a novel species of the genus Aurantimonas, for which the name Aurantimonas frigidaquae sp. nov. is proposed. The type strain is CW5 T (5KCTC 12893 T 5JCM 14755 T ).
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