geoalkalibacter ferrihydriticus geoalkalibacter ferrihydriticus geoalkalibacter ferrihydriticus is a gram-negative, obligately anaerobic, non-spore-forming, iron-reducting bacterium from the genus of geoalkalibacter which has been isolated from sediments from the lake khadin in russia. geoalkalibacter ferrihydriticus scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfuromonadia order: desulfuromonadales family: geoalkalibacteraceae genus: geoalkalibacter species: g. ferrihydriticus binomial name geoalkalibacter ferrihydriticuszavarzina et al. 2007 type strain dsm 17813, vkm b-2401, vkmb-2401, z-0531 synonyms desulfuromonas alkaliphilus