Order Rhodobacterales

Family Hyphomonadaceae
Hirschia - Hyphomonas - Maricaulis - Oceanicaulis - Robiginitomaculum

Family Rhodobacteraceae
Ahrensia - Albimonas - Albidovulum - Amaricoccus - Antarctobacter - Catellibacterium - Citreicella - Citreimonas - Dinoroseobacter - Donghicola - Gemmobacter - Haematobacter - Jannaschia - Ketogulonicigenium - Labrenzia - Leisingera - Loktanella - Maribius - Marinovum - Maritimibacter - Methylarcula - Nereida - Nesiotobacter - Oceanibulbus - Oceanicola - Octadecabacter - Palleronia - Pannonibacter - Paracoccus - Pelagibaca - Pelagicola - Phaeobacter - Ponticoccus - Pseudorhodobacter - Pseudoruegeria - Pseudovibrio - Rhodobaca - Rhodobacter - Rhodothalassium - Rhodovulum - Roseibacterium - Roseibium - Roseicyclus - Roseinatronobacter - Roseisalinus - Roseivivax - Roseobacter - Roseovarius - Rubellimicrobium - Rubrimonas - Ruegeria - Sagittula - Salipiger - Shimia - Silicibacter - Staleya - Stappia - Sulfitobacter - Tateyamaria - Thalassobacter - Thalassobius - Thalassococcus - Thioclava - Thiosphaera - Tranquillimonas - Wenxinia - Woodsholea - Yangia

Order Rhodospirillales

Family Acetobacteraceae
Acetobacter - Acidicaldus - Acidiphilium - Acidisphaera - Acidocella - Acidomonas - Asaia - Belnapia - Craurococcus - Gluconacetobacter - Gluconobacter - Granulibacter - Kozakia - Muricoccus - Neoasaia - Paracraurococcus - Rhodopila - Rhodovarius - Roseococcus - Roseomonas - Rubritepida - Saccharibacter - Stella - Swaminathania - Tanticharoenia - Teichococcus - Zavarzinia

Family Rhodospirillaceae
Azospirillum - Caenispirillum - Conglomeromonas - Defluviicoccus - Inquilinus - Magnetospirillum - Phaeospirillum - Rhodocista - Rhodospira - Rhodospirillum - Rhodovibrio - Roseospira - Skermanella - Telmatospirillum - Thalassobaculum - Thalassospira - Tistrella

Order Rickettsiales

Family Anaplasmataceae
Aegyptianella - Anaplasma - Cowdria - Ehrlichia - Neorickettsia - Wolbachia

Family Holosporaceae
Holospora

Family Rickettsiaceae
Orientia - Rickettsia

Unclassified Rickettsiales
Lyticum - Pseudocaedibacter - Symbiotes - Tectibacter

Order Sneathiellales

Family Sneathiellaceae
Sneathiella