Qingshengfania soli Zhang et al. 2015 is a later heterotypic synonym of Pseudochelatococcus lubricantis Kämpfer et al. 2015.

Qingshengfania soli DSM 103870T was compared with Pseudochelatococcus lubricantis MPA 1113T to clarify the taxonomic relationship of both species because of their high phylogenetic relationship. 16S rRNA gene sequence comparisons demonstrated that these species share 100  % sequence similarity. Investigation of fatty acid patterns, substrate utilization, and matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) profiles displayed no striking differences between the type strains of both species. DNA-DNA hybridization between both strains showed a 95 % (reciprocal 82 %) similarity, which clearly demonstrated that both strains are members of the same species. Due to priority of publication and validation of the name, Qingshengfania soli is reclassified as Pseudochelatococcus lubricantis, based on the estimated phylogenetic position derived from 16S rRNA gene sequence data, fatty acid, biochemical data, MALDI-TOF, and DNA-DNA hybridization results.

Pseudochelatococcus lubricantis gen. nov., sp. nov. and Pseudochelatococcus contaminans sp. nov. from coolant lubricants.

Two Gram-negative, rod-shaped, non-spore-forming bacteria, isolated from metal working fluids were investigated to determine their taxonomic positions. On the basis of 16S rRNA gene sequence phylogeny, both strains (MPA 1113(T) and MPA 1105(T)) formed a distinct cluster with 97.7 % sequence similarity between them, which was in the vicinity of members of the genera Methylobacterium, Camelimonas, Chelatococcus, Bosea, Salinarimonas and Microvirga to which they showed low sequence similarities (below 94 %). The predominant compounds in the polyamine pattern and in the quinone system of the two strains were spermidine and ubiquinone Q-10, respectively. The polar lipid profiles were composed of the major compounds: phosphatidylmonomethylethanolamine, phosphatidylglycerol, phosphatidylcholine, major or moderate amounts of diphosphatidylglycerol, two unidentified glycolipids and three unidentified aminolipids. Several minor lipids were also detected. The major fatty acids were either C19 : 0 cyclo ω8c or C18 : 1ω7c. The results of fatty acid analysis and physiological and biochemical tests allowed both, the genotypic and phenotypic differentiation of the isolates from each other, while the chemotaxonomic traits allowed them to be differentiated from the most closely related genera. In summary, low 16S rRNA gene sequence similarities and marked differences in polar lipid profiles, as well as in polyamine patterns, is suggestive of a novel genus for which the name Pseudochelatococcus gen. nov. is proposed. MPA 1113(T) ( = CCM 8528(T) = LMG 28286(T) = CIP 110802(T)) and MPA 1105(T) ( = CCM 8527(T) = LMG 28285(T)) are proposed to be the type strains representing two novel species within the novel genus, Pseudochelatococcus gen. nov., for which the names Pseudochelatococcus lubricantis sp. nov. and Pseudochelatococcus contaminans sp. nov. are suggested, respectively.