It is a class of Euryarchaeota also known as Halophilic Archaea. It is found in water saturated or nearly saturated with salt.
Halobacteria are now recognized as Archaea, rather than bacteria and are one of the largest groups. These microorganisms are members of the Halophile Community, which require high salt concentrations to grow.
Their high density in the water is often lead to pink or red colourations of the water. This is probably due to the possessing high level of carotenoid pigments present in its cells for UV protection.
According to a study by a Pune-based institute, the colour of water in Lonar lake in Maharashtra turned pink due to a large presence of these microbes.
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