marvinbryantia marvinbryantia marvinbryantia is a cellulose and methylcellulose degrading bacterial genus from the family of lachnospiraceae with one known species (marvinbryantia formatexigens). marvinbryantia formatexigens occurs in human feces. marvinbryantia scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: lachnospiraceae genus: marvinbryantiawolin et al. 2008 type species marvinbryantia formatexigens species m. formatexigens synonyms bryantella