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Phylogenetic heterogeneity within the genus Herpetosiphon: transfer of the marine species Herpetosiphon cohaerens, Herpetosiphon nigricans and Herpetosiphon persicus to the genus Lewinella gen. nov. in the Flexibacter-Bacteroides-Cytophaga phylum

L. I. Sly, M. Taghavit and M. Fegan

Centre for Bacterial Diversity and Identification, Department of Microbiology, The University of Queensland, Brisbane, Australia 4072

Author for correspondence: L. I. Sly. Tel: +61 7 3365 2396. Fax: +61 7 3365 1566. e-mail: sly{at}biosci.uq.edu.au

ABSTRACT

Analysis of the 16S rDNA sequences of species currently assigned to the genus Herpetosiphon revealed intrageneric phylogenetic heterogeneity. The thermotolerant freshwater species Herpetosiphon geysericola is most closely related to the type species Herpetosiphon aurantiacus in the Chloroflexus subdivision of the green non-sulfur bacteria. The marine species Herpetosiphon cohaerens, Herpetosiphon nigricans and Herpetosiphon persicus, on the other hand, were found to form a cluster with the sheathed bacterium Haliscomenobacter hydrossis in the Saprospira group of the Flexibacter-Bacteroides-Cytophaga (FBC) phylum. A proposal is made to transfer these marine species to the genus Lewinella gen. nov. as Lewinella cohaerens comb. nov., Lewinella nigricans comb. nov. and Lewinella persica comb. nov. The marine sheathed gliding bacterium Flexithrix dorotheae was also found to be a member of the FBC phylum but on a separate phylogenetic line to the marine herpetosiphons now assigned to the genus Lewinella.

Key Words: Herpetosiphon • Lewinella gen. nov. • Flexibacter-Bacteroides-Cytophaga phylum

Present address: College of Agriculture, Shiraz University, Shiraz, Iran.

The GenBank accession numbers for the rDNA sequences of Herpetosiphon geysericola ATCC 23076^T, Lewinella cohaerens ATCC 23123^T, Lewinella nigricans ATCC 23147^T, Lewinella persica ATCC 23167^Tand Flexithrix dorotheae ATCC 23163^Treported in this paper are AF039292-AF039296, respectively.

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