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Strain CMS 21wT was isolated from a cyanobacterial mat sample taken from a pond located in the McMurdo Dry Valleys, Antarctica. Based on its phenotypic, chemotaxonomic and phylogenetic properties, strain CMS 21wT was identified as a member of the genus Sporosarcina. At the 16S rRNA gene level, CMS 21wT exhibited about 93–96 % similarity to all reported species of Sporosarcina and exhibited a maximum similarity of 96 % to both Sporosarcina globispora and Sporosarcina psychrophila. Based on more than 3 % difference at the 16S rRNA gene sequence level and the presence of distinct differences with respect to phenotypic, biochemical and chemotaxonomic features, strain CMS 21wT (=MTCC 4670T=DSM 15428T=CIP 107784T) is proposed as the type strain of a novel species of Sporosarcina, Sporosarcina macmurdoensis sp. nov.
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