AlphaproteobacteriaCaulobacteralesHyphomicrobialesRickettsialesSphingomonadalesRhodospirillalesAcetobacteralesRhodobacteralesCandidatus PelagibacteralesHyphomonadalesMaricaulalesCandidatus PuniceispirillalesParvularculalesHolosporalesGeminicoccalesKordiimonadalesAlphaproteobacteria incertae sedisSneathiellalesEmcibacteralesMinwuialesRhodothalassialesIodidimonadalesMicropepsalesFutianialesRadicibacteralesunclassified Alphaproteobacteria