The ferruphiles genus group has replaced their ancestors the micro fort as well as the offensive microfort, ramming infiltrator, sifterfort, and stalkfort. Nitrogen cycle microbes on Sagan 4. This group is truly global in that they are found in every biome, be it on land, the the water, under ground or in the air. They are at the base of all ecosystems in that they complete the iron cycle. The iron cycle starts out with specific ferrocycle microbes converting Ferrous oxide FeO into Fe2+. This allows for more advanced organisms to move into the areas, allowing for advanced colonization.