FISH images of probe Pse136-defined bacteria in activated sludge FISH images show bacteria hybridizing with the bacterial probes EUBmix (green) and probe Pse136 (red). Yellow microcolonies and cells are overlay of red and green. Scale bar represents 5 microns. - Source:1Aerobic heterotroph
Members of the Candidatus Accumulimonas genus are putative PAOs that appear to have a similar physiology to the Accumulibacter. FISH-MAR analysis indicate that they differ in their ability to assimilate ethanol 1, although more recent genomic studies indicate that some strains of Accumulibacter are also able to utilize this substrate 155. Originally classified to the genus Halomonas they have been reclassified as 'Candidatus Accumulimonas' in the MiDAS taxonomy as they form a novel clade seperate from other members of the genus.
Activated sludge plants with nutrient removal 1.
 Nguyen, Nielsen, Nielsen (2012): 'Candidatus Halomonas phosphatis', a novel polyphosphate-accumulating organism in full-scale enhanced biological phosphorus removal plants. Environ. Microbiol. 14(10): 2826-37. doi:10.1111/j.1462-2920.2012.02826.x
 Skennerton, Barr, Slater, Bond, Tyson (2015): Expanding our view of genomic diversity in Candidatus Accumulibacter clades. Environ. Microbiol. 17(5): 1574-85. doi:10.1111/1462-2920.12582