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Halomonas almeriensis sp. nov., a moderately halophilic, exopolysaccharide-producing bacterium from Cabo de Gata, Almería, south-east Spain

Microbial Exopolysaccharide Research Group, Department of Microbiology, Faculty of Pharmacy, Campus Universitario de Cartuja s/n, University of Granada, 18071 Granada, Spain

Correspondence
Emilia Quesada
equesada{at}ugr.es

Halomonas almeriensis sp. nov. is a Gram-negative non-motile rod that was isolated from a saltern in the Cabo de Gata-Níjar wildlife reserve in Almería, south-east Spain. It is moderately halophilic, capable of growth at concentrations of 5–25 % w/v sea-salt mixture, the optimum being 7·5 % w/v. It is chemo-organotrophic and strictly aerobic, produces catalase but not oxidase, does not produce acid from any sugar and does not synthesize hydrolytic enzymes. The most notable difference between this micro-organism and other Halomonas species is that it is very fastidious in its use of a carbon source. It forms mucoid colonies due to the production of an exopolysaccharide. Its G+C content is 63·5 mol%. A comparison of 16S rRNA gene sequences confirmed its relationship to Halomonas species. The most closely related species is Halomonas halmophila with 95·8 % similarity between their 16S rRNA gene sequences. DNA–DNA hybridization with H. halmophila is 10·1 %. Its major fatty acids are 18 : 17c, 16 : 0, 16 : 17c/15 : 0 iso 2-OH, 12 : 0 3-OH, 12 : 0, 11-methyl 18 : 17c and 10 : 0. The proposed name is Halomonas almeriensis sp. nov., with strain M8^T (=CECT 7050^T=LMG 22904^T) as the type strain.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain M8^T is AY858696.

A dendrogram based on the simple-matching coefficient and UPGMA method, a neighbour-joining tree showing the phylogenetic relationships between H. almeriensis and other Halomonas species and taxa of Gram-negative halophilic bacteria, and a transmission electron micrograph showing the morphology of strain M8^T are available as supplementary material in IJSEM Online.

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