1887

Abstract

constitute a globally widespread phylum and mainly inhabit soil environments. Despite their high abundance and activity, only 60 species from seven of the 26 acidobacterial subdivisions (sds; corresponding to class level) are (validly) described. Thus, only a low number of higher taxonomic ranks is currently distinguished within the . Additionally, the distribution of the known acidobacterial species within the described families of the (sd1), (sd3), (sd4), (sd4), (sd8) and (sd8) is extremely biased as most strains are affiliated with the . Members of this family are characteristic for acidic soils. In contrast, culture-independent analysis of microbial communities worldwide revealed that sd6 prevail in soils with neutral pH. To improve the existing acidobacterial taxonomy, we here formally describe the first family within sd6 , the . Members of the are aerobic, neutrophilic, psychrotolerant to mesophilic chemoheterotrophs. Their cells stain Gram-negative, do not form capsules or spores, and are non-motile. They occur as single cells or in aggregates and divide by binary fission. Growth occurs on sugars or complex proteinaceous compounds. MK-8 is the major quinone. Major fatty acids are iso-C, summed feature 3 (Cω7/Cω6), Cω7 or ω9, iso-Cω9, C and iso-C. Diphosphatidylglycerol, phosphatidylethanolamine, phosphatidylcholine and phosphatidylglycerol are the major polar lipids. Unidentified glycolipids or unknown phospholipids might also be present. The G+C content of the DNA ranges from 64.7 to 65.9 mol%. Within the fam. nov., and are the only genera described so far.

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2018-07-01
2024-03-29
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