Published In

International Journal Of Systematic And Evolutionary Microbiology

Document Type


Publication Date



Thermophilic bacteria -- Pacific Ocean, Water -- Microbiology, Thermophilic bacteria -- Phylogeny, Hydrothermal vent ecology -- Pacific Ocean


A novel moderately thermophilic, heterotrophic bacterium was isolated from a deep-sea hydrothermal vent deposit from the Mariner field along the Eastern Lau Spreading Center, Southwestern Pacific. Cells were short motile rods (about 0.4 μm-0.8 μm) that occurred singly or in pairs and were surrounded by a sheath-like membrane or ‘toga’. The cells grew between 45 and 65°C (optimum 57-60°C), pH 4.1-6.0 (optimum pH 5.5-5.7) and optimally at 3% (w/v) NaCl. The isolate grew on a range of carbon and proteinaceous substrates and reduced sulfur. The G + C content of the DNA was about 45 mol%. Phylogenetic analysis of the 16S rRNA gene placed the new isolate as a deeply diverging lineage within the Thermotogales. Based on the physiological, morphological and phylogenetic data, the isolate is a novel species of a new genus with the proposed name Mesoaciditoga lauensis gen. nov. sp. nov. The type strain is cd-1655RT (DSM 25116, OCM 1212).


DOI: 10.1099/ijs.0.050518-0

This is an author manuscript that has been accepted for publication in International Journal of Systematic and Evolutionary Microbiology, copyright International Union of Microbiological Societies, but has not been copy-edited, formatted or proofed. Available to download after a 24 month embargo period from the date of publication. Cite this article as appearing in International Journal of Systematic and Evolutionary Microbiology.

The version of record can be found at, and is freely available to view without a subscription 24 months after publication.



Persistent Identifier

Included in

Microbiology Commons