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Shewanella irciniae sp. nov., a novel member of the family Shewanellaceae, isolated from the marine sponge Ircinia dendroides in the Bay of Villefranche, Mediterranean Sea

¹ Coastal Marine Laboratory/Department of Biology, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, People's Republic of China
² Division of Environmental Science and Engineering, The National University of Singapore, Singapore
³ Department of Biology, The Chinese University of Hong Kong, Shatin, N. T., Hong Kong SAR, People's Republic of China
⁴ Microbial Ecology and Biogeochemistry Group, Laboratoire d'Océanographie de Villefranche-sur-Mer, Villefranche-sur-Mer, France

Correspondence
Pei-Yuan Qian
boqianpy{at}ust.hk

Strain UST040317-058^T, comprising non-pigmented, rod-shaped, facultatively anaerobic, Gram-negative cells that are motile by means of single polar flagella, was isolated from the surface of a marine sponge (Ircinia dendroides) collected from the Mediterranean Sea. Comparative 16S rRNA gene sequence-based phylogenetic analysis placed the strain in a separate cluster with the recognized bacterium Shewanella algae IAM 14159^T, with which it showed a sequence similarity of 95.0 %. The sequence similarity between strain UST040317-058^T and its other (six) closest relatives ranged from 91.6 to 93.8 %. Strain UST040317-058^T showed oxidase, catalase and gelatinase activities. The typical respiratory quinones for shewanellas, menaquinone MK-7 and ubiquinones Q-7 and Q-8, were also detected. The predominant fatty acids in strain UST040317-058^T were i15 : 0, 16 : 0, 17 : 18c and summed feature 3 (comprising i15 : 0 2-OH and/or 16 : 17c), altogether representing 56.9 % of the total. The DNA G+C content was 39.9 mol%. The strain could be differentiated from other Shewanella species by its inability to reduce nitrate or produce H₂S and by 10–22 additional phenotypic characteristics. On the basis of the phylogenetic and phenotypic data presented in this study, strain UST040317-058^T represents a novel species in the genus Shewanella, for which the name Shewanella irciniae sp. nov. is proposed. The type strain is UST040317-058^T (=JCM 13528^T=NRRL B-41466^T).

A scanning electron micrograph of cells of strain UST040317-058^T is available as a supplementary figure in IJSEM Online.

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