ChlorobiRANK: PhylumTAXONOMY: cellular organisms -> Bacteria -> Bacteroidetes/Chlorobi group -> Chlorobi OVERVIEW: The green sulfur bacteria (Chlorobiaceae) are a family of obligately anaerobic photoautotrophic bacteria. Together with the non-photosynthetic Ignavibacteriaceae, they form the phylum Chlorobi. Most closely related to the distant Bacteroidetes, they are accordingly assigned their own phylum.[Green sulfur bacteria are nonmotile (except Chloroherpeton thalassium, which may glide)[ and occur in spheres, rods, and spirals.[citation needed] Photosynthesis is achieved using a Type 1 Reaction Centre using bacteriochlorophyll (BChl) a and in chlorosomes which employ BChl c, d, or e; in addition chlorophyll a is also present. They use sulfide ions, hydrogen or ferrous iron as an electron donor and the process is mediated by the type I reaction centre and Fenna-Matthews-Olson complex. Elemental sulfur deposited outside the cell may be further oxidized. By contrast, the photosynthesis in plants uses water as the electron donor and produces oxygen. Chlorobium tepidum has emerged as a model organism for the group
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