[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Domain Bacteria Woese et al. 1990 stat. inval. see Domain Bacteria Woese et al. 2024
     Phylum "Proteobacteria" Garrity et al. 2005 stat. inval. see Phylum Pseudomonadota Garrity et al. 2021
       Class Alphaproteobacteria Garrity et al. 2006
         Order Rhizobiales Kuykendall 2006 see Order Hyphomicrobiales Douglas 1957 (Approved Lists 1980)
           Family Phyllobacteriaceae Mergaert and Swings 2006 see Family Bartonellaceae Gieszczykiewicz 1939 (Approved Lists 1980)
             Genus Mesorhizobium Jarvis et al. 1997
               01 Mesorhizobium loti (Jarvis et al. 1982) Jarvis et al. 1997
               02 Mesorhizobium amorphae Wang et al. 1999
               03 Mesorhizobium chacoense Velázquez et al. 2001
               04 Mesorhizobium ciceri (Nour et al. 1994) Jarvis et al. 1997
               05 Mesorhizobium huakuii (Chen et al. 1991) Jarvis et al. 1997
               06 Mesorhizobium mediterraneum (Nour et al. 1995) Jarvis et al. 1997
               07 Mesorhizobium plurifarium de Lajudie et al. 1998
               08 Mesorhizobium septentrionale Gao et al. 2004
               09 Mesorhizobium temperatum Gao et al. 2004
               10 Mesorhizobium thiogangeticum Ghosh and Roy 2006
               11 Mesorhizobium tianshanense (Chen et al. 1995) Jarvis et al. 1997