1887

Abstract

Members of the phylum ‘’ are important heterotrophs involved in cycling organic carbon in aquatic habitats. Their diversity has been studied by molecular methods in both freshwater and marine habitats and many novel genera and species within this phylum have been characterized in recent years. In this study, we examined the diversity of members of the ‘’ that could be readily isolated on solid media from river epilithon and coastal sea water. Most (93 %) of the 55 isolates confirmed as members of the ‘’ and examined by phylogenetic analysis of 16S rRNA gene sequences belonged to the . Furthermore, most (62 %) of these were almost certainly members of the genus and all but one were from river epilithon. Conversely, the sea-water isolates were more widely distributed in clades containing other genera. Some of the isolates were deep-branching within phylogenetic trees and so could not be assigned to putative genera. Two of these deep-branching isolates were characterized by polyphasic taxonomy and are proposed as novel species within two new genera of the family . These are gen. nov., sp. nov. (type strain EP105=NCIMB 14026=DSM 16811) and gen. nov., sp. nov. (type strain SW256=NCIMB 14027=DSM 16809).

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2006-01-01
2020-01-26
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