Distribution
The phylum Fibrobacteres is considered to be closely related to the CFB . The only genus in this phylum is Fibrobacter that contains strains from the guts of many mammals including cattle and pigs. The two described species in this genus namely, Fibrobacter succinogenes and Fibrobacter intestinalis are important members of fibrolytic communities in mammalian guts and have received a lot of attention in recent decades due to the long-standing interest microbes capable of degrading plant fiber.
Molecular evidence based on the amplification of 16rRNA genes from various environments suggest that the phylum is much more widespread than previously thought. Most of the clones from mammalian environments group along with the known isolates in what has been called Fibrobacteres subphylum 1. Members of Fibrobacteres subphylum 2 however, have so far been found only in the gut of termites. Due to the lack of cultured representatives from subphylum 2, it is so far unclear as to the role they might play in termite guts.
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