text: * Albidiferax (Betaproteobacteria)
  * Shewanella (Gammaproteobacteria)
  * Geobacter (Deltaproteobacteria)
  * Geothrix fermentans (Acidobacteria)
  * Deferribacter (Deferribacteres)
  * Thermoanaerobacter (Firmicutes)