Based on 16S rRNA sequence analysis, Pedomicrobium is a bacterium that belongs to the family Hyphomicrobiaceae, within the order of Rhizobiales under the class of alphaproteobacteria, in the phylum Proteobacteria (Garrity et al., 2001). There are twenty genera belonging to the Hyphomicrobiaceae family (Williams et al., 1990), of which Pedomicrobium is most closely related to Hyphomicrobium and Filomicrobium (Stahl et al., 1992).

The genus Pedomicrobium consists of three species, with Mn oxidizing and accumulating species represented by Pedomicrobium manganicum and Pedomicrobium americanum, whilst the species Pedomicrobium ferrugineum oxidizes iron but not Mn (Cox and Sly, 1997).

Reference:

Garrity G. M., Winters M. and Searles D. B.; (2001); 'Taxonomic outline of the procaryotic genera Bergey's manual of systematic bacteriology, Second Edition Release 1.0

Stahl D. A., Key R., Flesher B., and Smit J.; (1992); 'The phylogeny of marine and freshwater Caulobacter reflects their habitat'; Journal of Bacteriology 174:2193-2198.

Cox T. L, and Sly L. I; (1997); 'Phylogenetic relationships and uncertain taxonomy of Pedomicrobium species'; International Journal of Systematic Bacteriology 47(2):377-380.