3.2.4. Alphaproteobacteria

The GMT sequences of *Alphaproteobacteria* represent a diverse major branch, which includes the species of *Sphingomonadales, Rhodothalassiales, Rhodobacterales,* and *Rhodospirillales*, but no *Rhizobiales* (Figure 1). The following distinct subbranches of *Alphaproteobacteria* are formed:

