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Deefgea rivuli gen. nov., sp. nov., a member of the class Betaproteobacteria

¹ DSMZ – German Collection of Microorganisms and Cell Cultures GmbH, Inhoffenstr. 7b, 38124 Braunschweig, Germany
² Helmholtz Centre for Infection Research, Inhoffenstr. 7, 38124 Braunschweig, Germany

Correspondence
Erko Stackebrandt
erko{at}dsmz.de

Two strains, designated WB 3.4-79^T and WB 3.3-25, were isolated from a hard-water sample collected from the Westerhöfer Bach, Lower Saxony, Germany. The strains shared 100 % DNA–DNA relatedness, indicating membership of the same genospecies. This close relationship was supported by identical 16S rRNA gene sequences and high similarities in fatty acid composition and biochemical characteristics. The G+C content of the genomic DNA of strain WB 3.4-79^T was 48.5 mol% and the predominant ubiquinone was Q-8. Major polar lipids were phosphatidylethanolamine and phosphatidylglycerol. Major fatty acids (>10 %) were C_{16 : 0} and C_{16 : 1}7c. Polyhydroxybutyrate and polyphosphate granules as well as unidentified enterosomes and a polar organelle are visible by electron microscopy. Comparative 16S rRNA gene sequence analysis indicated that the isolates were placed within the class Betaproteobacteria, remotely related to Chitinibacter tainanensis DSM 15459^T, Silvimonas terrae KCTC 12358^T, Formivibrio citricus DSM 6150^T and Iodobacter fluviatilis DSM 3764^T. On the basis of phylogenetic and phenotypic distinctness, we propose a novel genus, Deefgea gen. nov., with Deefgea rivuli sp. nov. as the type species. The type strain of Deefgea rivuli is strain WB 3.4-79^T (=DSM 18356^T=CIP 109326^T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain WB 3.4-79^T is AM397080.

Results of EELS and a 16S rRNA gene sequence-based maximum-likelihood tree are available as supplementary material in IJSEM Online.

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