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Pseudomonas aeruginosa infects patients with cystic fibrosis, burns, wounds and implants. Previously, our group showed that elevated Ca 2+ positively regulates the production of several virulence factors in P. aeruginosa , such as biofilm formation, production of pyocyanin and secreted proteases. We have identified a Ca 2+ -regulated β-propeller putative phytase, CarP, which is required for Ca 2+ tolerance, regulation of the intracellular Ca 2+ levels, and plays a role in Ca 2+ regulation of P. aeruginosa virulence. Here, we studied the conservation of carP sequence and its occurrence in diverse phylogenetic groups of bacteria. In silico analysis revealed that carP and its two paralogues PA2017 and PA0319 are primarily present in P. aeruginosa and belong to the core genome of the species. We identified 155 single nucleotide alterations within carP , 42 of which lead to missense mutations with only three that affected the predicted 3D structure of the protein. PCR analyses with carP -specific primers detected P. aeruginosa specifically in 70 clinical and environmental samples. Sequence comparison demonstrated that carP is overall highly conserved in P. aeruginosa isolated from diverse environments. Such evolutionary preservation of carP illustrates its importance for P. aeruginosa adaptations to diverse environments and demonstrates its potential as a biomarker.