Journal
TRENDS IN MICROBIOLOGY
Volume 13, Issue 5, Pages 193-195Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tim.2005.03.002
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Two groups of microbiologists have independently isolated 'Walsby's square bacterium' from salt crystallizer ponds; its growth depends on pyruvate. Genetic analysis shows that the squares, discovered 25 years ago on the Sinai Peninsula, are archaea rather than bacteria. These transparent tile-like cells might have been dismissed as surface artefacts of salt crystals but for their gas vesicles-structures peculiar to prokaryotic organisms. Paradoxically, the square archaea are the dominant microorganisms in some hypersaline environments and might be globally important.
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