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Thalassobacter stenotrophicus Macián et al. 2005 is a later synonym of Jannaschia cystaugens Adachi et al. 2004, with emended description of the genus Thalassobacter

¹ Instituto Cavanilles de Biodiversidad y Biología Evolutiva, Universitat de València, Campus de Burjassot, 46100 València, Spain
² Departamento de Microbiología y Ecología, Universitat de València, Campus de Burjassot, 46100 València, Spain
³ Colección Española de Cultivos Tipo (CECT), Facultad de Biología, Universitat de València, Campus de Burjassot, 46100 València, Spain

Correspondence
M. J. Pujalte
maria.j.pujalte{at}uv.es

The type strains of Jannaschia cystaugens (LMG 22015^T) and Thalassobacter stenotrophicus (CECT 5294^T) were analysed by means of genomic DNA–DNA hybridization, comparison of 16S rRNA gene sequences and phenotypic properties determined under the same methodological conditions. J. cystaugens LMG 22015^T showed DNA–DNA relatedness levels of 72 % when hybridized with the genomic DNA of T. stenotrophicus CECT 5294^T. Sequence comparisons revealed that the 16S rRNA genes of the two strains had a similarity of 99·8 %. The cellular fatty acid and polar lipid compositions of the two strains and their DNA mol% G+C contents were almost identical. Bacteriochlorophyll a (Bchl a) and polyhydroxybutyrate were produced by both strains under the same culture conditions. Their closest phylogenetic neighbours were Jannaschia helgolandensis and Jannaschia rubra; however, the low sequence similarity values (95·7–95·9 %) and several important differences in phenotypic traits (ionic requirements, Bchl a production and polar lipids) support the distinction between the genera Thalassobacter and Jannaschia. Thus, we propose the unification of J. cystaugens (LMG 22015^T) and T. stenotrophicus (CECT 5294^T) as Thalassobacter stenotrophicus (type strain, CECT 5294^T=DSM 16310^T). An emended description of the genus Thalassobacter is also presented.

Published online ahead of print on 6 May 2005 as DOI 10.1099/ijs.0.63617-0.

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