mordavella mordavella mordavella is a gram-negative bacterial genus from the family of clostridiaceae with one known species (mordavella massiliensis). mordavella massiliensis has been isolated from human feces mordavella scientific classification domain: bacteria phylum: bacillota class: clostridia order: clostridiales family: clostridiaceae genus: mordavellandongo et al. 2017 species m. massiliensis