geobacter chapellei geobacter chapellei geobacter chapellei is a gram-negative, strictly anaerobic, mesophilic and non-motile bacterium from the genus of geobacter which has been isolated fromaq uifer sediments from the atlantic coastal plain in the united states. geobacter chapellei scientific classification domain: bacteria phylum: thermodesulfobacteriota class: desulfuromonadia order: geobacterales family: geobacteraceae genus: geobacter species: g. chapellei binomial name geobacter chapelleicoates et al. 2001 type strain 172, atcc 51744, dsm 13688 synonyms pelotalea chapellei (coates et al. 2001) xu et al. 2022 "pseudopelobacter chapellei" (coates et al. 2001) waite et al. 2020