desulfovibrio gracilis desulfovibrio gracilis desulfovibrio gracilis is a moderately halophilic bacteria. it is sulfate-reducing, mesophilic and motile. its type strain is srl6146t (=dsm 16080t =atcc baa-904t). desulfovibrio gracilis scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfovibrionia order: desulfovibrionales family: desulfovibrionaceae genus: desulfovibrio species: d. gracilis binomial name desulfovibrio gracilismagot et al. 2004