geogemma geogemma in taxonomy, geogemma is a genus of the family pyrodictiaceae. geogemma scientific classification domain: archaea phylum: thermoproteota class: thermoprotei order: desulfurococcales family: pyrodictiaceae genus: "geogemma"kashefi, holmes & lovley 2006 type species "geogemma indica"kashefi, holmes & lovley 2006 species "g. barossii" "g. indica" "g. pacifica"