Order Nitrosomonadales

Family Gallionellaceae
Gallionella

Family Nitrosomonadaceae
Nitrosolobus - Nitrosomonas - Nitrosospira

Family Spirillaceae
Spirillum

Order "Procabacteriales"

Family "Procabacteriaceae"
" Procabacter "

Order Rhodocyclales

Family Rhodocyclaceae
Azoarcus - Azonexus - Azospira - Azovibrio - Dechloromonas - Dechlorosoma - Denitratisoma - Ferribacterium - Methyloversatilis - Propionibacter - Propionivibrio - Quatrionicoccus - Rhodocyclus - Shinella - Sterolibacterium - Thauera - Uliginosibacterium - Zoogloea

Class Deltaproteobacteria or Deltabacteria

Order Bdellovibrionales

Family Bacteriovoracaceae
Bacteriolyticum (illegitimate genus) - Bacteriovorax- Peredibacter

Family Bdellovibrionaceae
Bdellovibrio - Micavibrio - Vampirovibrio

Family Peredibacteraceae (illegitimate)

Order Desulfarculales

Family Desulfarculaceae
Desulfarculus

Order Desulfobacterales

Family Desulfobacteraceae
Desulfatibacillum - Desulfatiferula - Desulfatirhabdium - Desulfobacter - Desulfobacterium - Desulfobacula - Desulfocella - Desulfococcus - Desulfofaba - Desulfofrigus - Desulfoluna - Desulfomusa - Desulfonema - Desulforegula - Desulfosarcina - Desulfospira - Desulfotignum

Family Desulfobulbaceae
Desulfobulbus - Desulfocapsa - Desulfofustis - Desulfopila - Desulforhopalus - Desulfotalea - Desulfurivibrio

Family Nitrospinaceae
Nitrospina

Order Desulfovibrionales

Family Desulfohalobiaceae
Desulfohalobium - Desulfonatronospira - Desulfonatronovibrio - Desulfonauticus - Desulfothermus - Desulfovermiculus

Family Desulfomicrobiaceae
Desulfomicrobium

Family Desulfonatronaceae
Desulfonatronum

Family Desulfovibrionaceae
Bilophila - Desulfomonas - Desulfovibrio - Lawsonia

Order Desulfurellales

Family Desulfurellaceae
Desulfurella - Hippea

Order Desulfuromonadales

Family Desulfuromonadaceae
Desulfuromonas - Desulfuromusa - Malonomonas - Pelobacter

Family Geobacteraceae
Geoalkalibacter - Geobacter - Geopsychrobacter - Geothermobacter - Trichlorobacter

Order Myxococcales

Suborder Cystobacterineae

Family Cystobacteraceae
Anaeromyxobacter - Archangium - Cystobacter - Hyalangium - Melittangium - Stigmatella

Family Myxococcaceae
Angiococcus - Corallococcus - Myxococcus - Pyxidicoccus