berkelbacteria berkelbacteria berkelbacteria (formerly acd58) is a bacterial phylum with candidate status, meaning there are no cultured representatives for this group. it is part of the candidate phyla radiation. berkelbacteria scientific classification domain: bacteria (unranked): cpr group phylum: "berkelbacteria"wrighton et al. 2014 berkelbacteria was first reported in 2012, at which time it was classified as a divergent lineage of parcubacteria (od1) and referred to as acd58. it was proposed as a phylum in 2014. representatives of this phylum have been detected in a variety of environments, including a deep thermokarst lake in the sasapimakwananisikw river valley (qc, canada), an acetate-amended alluvial aquifer adjacent to the colorado river (co, usa), and marine sediments from the peru margin seafloor.