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Lewinella agarilytica sp. nov., a novel marine bacterium of the phylum Bacteroidetes, isolated from beach sediment

Department of Science Education, Cheju National University, Jeju 690-756, Republic of Korea

Correspondence
Soon Dong Lee
sdlee{at}cheju.ac.kr

A Gram-negative, aerobic, light-orange-coloured, marine bacterium (designated SST-19^T) was isolated from beach sediment in Jeju, Korea, and its taxonomic position was determined by means of a polyphasic approach. In a neighbour-joining phylogenetic tree based on 16S rRNA gene sequences, strain SST-19^T was positioned within the family ‘Saprospiraceae’, class Sphingobacteria, and formed a consistent cluster with Lewinella persica ATCC 23167^T (94.7 % sequence similarity). The levels of 16S rRNA gene sequence similarity between the isolate and recognized members of the family ranged from 84 to 89 %, with Lewinella cohaerens ATCC 23123^T, Lewinella nigricans ATCC 23147^T, Haliscomenobacter hydrossis DSM 1100^T and Saprospira grandis ATCC 23119^T showing values of 89.0 , 88.4 , 86.4 and 84.1 %, respectively. Strain SST-19^T required seawater for growth and its cells were unbranched, flexible rods or filaments with gliding motility. The cellular fatty acids consisted mainly of saturated, unsaturated and iso-branched fatty acids, the major components being C_{16 : 1}7c and/or iso-C_{15 : 0} 2-OH (24.1 %), C_{18 : 0} (13.5 %), iso-C_{15 : 0} (11.1 %) and C_{16 : 0} (10.9 %). The G+C content of the DNA was found to be 51.3 mol%. On the basis of the results from phenotypic and phylogenetic analyses, the isolate represents a novel species of the genus Lewinella, for which the name Lewinella agarilytica sp. nov. is proposed. The type strain is SST-19^T (=JBRI 2009^T=KCTC 12774^T=JCM 14216^T).

Cellular fatty acid compositions of strain SST-19^T and the type strains of recognized species of the genus Lewinella are available as a supplementary table with the online version of this paper.