“…At the time of writing, the genus includes only one species, Catellibacterium nectariphilum, which was isolated from activated sludge and requires a diffusible compound from other bacterial cultures for vigorous growth (Tanaka et al, 2004). Since 2008, many novel bacteria belonging to 'Rhodobacter clade' have been isolated from various environments, such as Rhodobacter megalophilus from soil (Arunasri et al, 2008), Rhodobacter maris and Rhodobacter aestuarii from marine environments , 2009, Rhodobacter ovatus from a polluted pond , Rhodovulum kholense from mud (Anil , Rhodovulum lacipunicei (Chakravarthy et al, 2009), Paracoccus halophilus from marine sediment (Liu et al, 2008), Paracoccus aestuarii from tidal-flat sediment (Roh et al, 2009), Paracoccus saliphilus from a salt lake (Wang et al, 2009) and Rhodobaca barguzinensis from sediments of a soda lake (Boldareva et al, 2008). Their wide distribution and metabolic diversity (such as heterotrophic, phototrophic and chemically autotrophic metabolism) suggest that members of this clade may play important roles in various ecosystems, especially aquatic environments.…”