Deferribacter
Denitrovibrio
Flexistipes
Geovibrio
The Deferribacteraceae are a family of bacteria, given their own phylum (Deferribacteres).

References

Huber, H., and Stetter, K.O. "Family I. Deferribacteraceae fam. nov." In: Bergey's Manual of Systematic Bacteriology, 2nd ed., vol. 1 (The Archaea and the deeply branching and phototrophic Bacteria) (D.R. Boone and R.W. Castenholz, eds.), Springer-Verlag, NewYork (2001). pp. 465-466.