falcatimonas falcatimonas falcatimonas is a gram-positive and strictly anaerobic bacterial genus from the family of clostridiaceae with one known species (falcatimonas natans). falcatimonas natans has been isolated from a methanogenic reactor which was filled with cattle waste. falcatimonas scientific classification domain: bacteria phylum: bacillota class: clostridia order: eubacteriales family: lachnospiraceae genus: falcatimonaswatanabe et al. 2016 species f. natans