Review Article

New Insights into the Taxonomy of Bacteria in the Genomic Era and a Case Study with Rhizobia

Table 1

List of genera comprising rhizobial species with valid names standing in nomenclature (LPSN) in October 2021. The number of valid names does not include synonyms.

α-Proteobacteria
Hyphomicrobiales (=Rhizobiales)
Rhizobiaceae

 Agrobacterium11 valid names2 rhizobia
 Allorhizobium8 valid names2 rhizobia
 Ensifer (=Sinorhizobium)20 valid names20 rhizobia
 Neorhizobium5 valid names4 rhizobia
 Pararhizobium6 valid names2 rhizobia
 Rhizobium92 valid names49 rhizobia
 Shinella8 valid names1 rhizobia

Phyllobacteriaceae

 Aminobacter7 valid names1 rhizobia
 Phyllobacterium12 valid names4 rhizobia
 Mesorhizobium59 valid names48 rhizobia

Nitrobacteraceae (=Bradyrhizobiaceae)

 Bradyrhizobium63 valid names58 rhizobia

Methylobacteriaceae

 Microvirga18 valid names4 rhizobia
 Methylobacterium47 valid names1 rhizobia

Brucellaceae

 Brucella (=Ochrobactrum)25 valid names2 rhizobia

Hyphomicrobiaceae

 Devosia26 valid names1 rhizobia

Xanthobacteraceae

 Azorhizobium3 valid names2 rhizobia

β-Proteobacteria
Burkholderiales
Burkholderiaceae

 Cupriavidus18 valid names2 rhizobia
 Paraburkholderia79 valid names22 rhizobia
 Trinickia7 valid names1 rhizobia