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1 Cardiff School of Biosciences, Cardiff University, PO Box 915, Main Building, Park Place, Cardiff CF10 3TL, UK
2 School of Earth, Ocean and Planetary Sciences, Cardiff University, PO Box 915, Main Building, Park Place, Cardiff CF10 3TL, UK
Correspondence
John C. Fry
Fry{at}Cardiff.ac.uk
Members of the phylum Bacteroidetes 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 Bacteroidetes 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 Bacteroidetes and examined by phylogenetic analysis of 16S rRNA gene sequences belonged to the Flavobacteriaceae. Furthermore, most (62 %) of these were almost certainly members of the genus Flavobacterium 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 Flavobacteriaceae. These are Epilithonimonas tenax gen. nov., sp. nov. (type strain EP105T=NCIMB 14026T=DSM 16811T) and Persicivirga xylanidelens gen. nov., sp. nov. (type strain SW256T=NCIMB 14027T=DSM 16809T).
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of Epilithonimonas tenax EP105T and Persicivirga xylanidelens SW256T are AF493696 and AF493688, respectively.
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