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Analysis of 16S rRNA sequences retrieved as cDNA (16S rcDNA) from the Octopus Spring cyanobacterial mat has permitted phylogenetic characterization of some uncultivated community members, expanding our knowledge or diversity within this microbial community. Two new cyanobacterial 16S rRNA sequences were discovered, raising to four the number of cyanobacterial sequence types known to occur in the mat. None of the sequences found is that of the cultivated thermophilic cyanobacterium Synechococcus lividus. A new 16S rRNA sequence characteristic of green nonsulfur bacteria and their relatives was discovered, raising to two the number of such sequences known to exist in the mat. Both are unique among the 16S rRNA sequences of cultivated members of this group, including an Octopus Spring isolate of Chloroflexus aurantiacus and Heliothrix oregonensis, whose sequences we report herein. Two spirochete-like 16S rRNA sequences were discovered. One can be placed in the leptospira subdivision of the spirochete group, but the other has such a loose affiliation with the spirochete group that it might actually belong to an as yet unrecognized subdivision or even to a new eubacterial line of descent.

Uncultivated cyanobacteria, Chloroflexus-like inhabitants, and spirochete-like inhabitants of a hot spring microbial mat