Butyrivibrio fibrisolvens based on their phenotypic and metabolic characteristics. However, phylogenetic analyses based on 16S ribosomal RNA (rRNA) gene sequences has divided the genus Butyrivibrio into six families. These families include the rumen isolates Butyrivibrio fibrisolvens, B. hungateii, B. proteoclasticus, Pseudobutyrivibrio xylanivorans, and P. ruminis and the human isolate B. crossotus. The families B. fibrisolvens, B. crossotus, B. hungateii as well as B. proteoclasticus all belong to the Clostridium sub-cluster XIVa. See also Roseburia References Further reading Palevich, N. (2016). Comparative genomics of Butyrivibrio and Pseudobutyrivibrio from the rumen : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Microbiology and Genetics at Massey University, Palmerston North, New Zealand (Thesis). Massey University. Retrieved from http://mro.massey.ac.nz/handle/10179/9992 or http://hdl.handle.net/10179/9992 Lachnospiraceae Bacteria genera Gut flora bacteria