Order Sphingomonadales

Family Erythrobacteraceae
Altererythrobacter - Erythrobacter - Erythromicrobium - Porphyrobacter

Family Sphingomonadaceae
Blastomonas - Erythromonas - Novosphingobium - Rhizomonas (rejected name) - Sandaracinobacter - Sandarakinorhabdus - Sphingobium - Sphingomonas - Sphingopyxis - Sphingosinicella - Zymomonas

Unclassified Alphaproteobacteria Elioraea - Geminicoccus - Insolitispirillum - Nisaea - Novispirillum

Class Betaproteobacteria

Order Burkholderiales

Family Alcaligenaceae
Achromobacter - Advenella - Alcaligenes - Azohydromonas - Bordetella - Brackiella - Castellaniella - Derxia - Kerstersia - Oligella - Pelistega - Pigmentiphaga - Pusillimonas - Sutterella - Taylorella - Tetrathiobacter

Family Burkholderiaceae
Burkholderia - Chitinimonas - Cupriavidus - Lautropia - Limnobacter - Pandoraea - Paucimonas - Polynucleobacter - Ralstonia - Thermothrix - Wautersia

Family Comamonadaceae
Acidovorax - Alicycliphilus - Brachymonas - Caenimonas - Caenibacterium - Caldimonas - Comamonas - Curvibacter - Delftia - Diaphorobacter - Giesbergeria - Hydrogenophaga - Hylemonella - Lampropedia - Macromonas - Malikia - Ottowia - Pelomonas - Polaromonas - Pseudacidovorax - Ramlibacter - Rhodoferax - Roseateles - Schlegelella - Simplicispira - Variovorax - Verminephrobacter - Xenophilus

Family Oxalobacteraceae
Collimonas - Duganella - Herbaspirillum - Herminiimonas - Janthinobacterium - Massilia - Naxibacter - Oxalicibacterium - Oxalobacter - Telluria - Undibacterium

Unclassified Burkholderiales
Aquabacterium - Aquincola - Ideonella - Leptothrix - Methylibium - Mitsuaria - Paucibacter - Rubrivivax - Sphaerotilus - Tepidicella - Tepidimonas - Thiobacter - Thiomonas - Xylophilus

Order Hydrogenophilales

Family Hydrogenophilaceae
Hydrogenophilus - Petrobacter - Tepidiphilus - Thiobacillus

Order Methylophilales

Family Methylophilaceae
Methylobacillus - Methylophilus - Methylotenera - Methylovorus

Order Neisseriales

Family Neisseriaceae
Alysiella - Andreprevotia - Aquaspirillum - Aquitalea - Bergeriella - Chitinibacter - Chitinilyticum Chromobacterium - Conchiformibius - Deefgea - Eikenella - Formivibrio - Gulbenkiania - Iodobacter - Kingella - Laribacter - Leeia - Microvirgula - Morococcus - Neisseria - Paludibacterium - Prolinoborus - Pseudogulbenkiania - Silvimonas - Simonsiella - Stenoxybacter - Uruburuella - Vitreoscilla - Vogesella