polynucleobacter rarus polynucleobacter rarus polynucleobacter rarus is an aerobic, chemo-organotrophic, catalase- and oxidase-positive, nonmotile bacterium of the genus polynucleobacter, isolated from an acidic lake in wisconsin. polynucleobacter rarus scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: burkholderiales family: burkholderiaceae genus: polynucleobacter species: p. rarus binomial name polynucleobacter rarushahn et al. 2011 type strain cip 109928, dsm 21648, mt-cbb6a5