Occallatibacter bavaricus sp. nov., a new representative of the Acidobacteriota isolated from fen soils, reclassification of Terracidiphilus gabretensis as Occallatibacter gabretensis comb. nov. and emended description of the genus Occallatibacter

The acidobacterial strain JP12^T affiliated with the <i>Terriglobales</i> has been isolated from fen soil sampled at Schlöppnerbrunnen II near Bayreuth, Germany. The strain was Gram-stain-negative, non-motile, displayed non-spore-forming rods that divide by binary fission and segregate exopolysaccharide-like structures. JP12^T grew at temperatures of 4-40 °C (best between 24 and 30 °C), at pH values of 3.7-6.0 (best between 4.1 and 5.6) and at NaCl concentrations of 0-0.5% (best 0.25%, w/v).MK-8 was identified as the major respiratory quinone. The major fatty acids of the strain JP12^T were <i>iso</i>-C_15:0, C_16:0, <i>iso</i>-C_17:1 <i>ω</i>7<i>c</i>, <i>iso</i>-C_17:0 and <i>iso</i>-diabolic acid. Phosphatidylglycerol, phosphatidylethanolamine and ornithine-containing lipids were the major polar lipids. Lysophosphatidylethanolamine, phosphatidylinositol, diphosphatidylglycerol and high-mass intact polar lipids occurred in small amounts. The G+C content of the strain JP12^T was 56.4 mol%. 16S rRNA gene sequence similarity values of 96.1-96.7% placed the strain JP12^T in the vicinity of the type strains of <i>Occallatibacter savannae</i> A2-1c^T, <i>Telmatobacter bradus</i> TPB6017^T, <i>Occallatibacter riparius</i> 277^T and <i>Terracidiphilus gabretensis</i> S55^T, respectively. Based on the phenotypic, phylogenetic and chemotaxonomic data, we propose the new species <i>Occallatibacter bavaricus</i> sp. nov. (type strain JP12^T=DSM 110680^T=CECT 30267^T) within the acidobacterial order <i>Terriglobales</i>. We also propose the reclassification of <i>Terracidiphilus gabretensis</i> as <i>Occallatibacter gabretensis</i> comb. nov.