clostridium ragsdalei clostridium ragsdalei "clostridium ragsdalei" is an anaerobic, motile, gram-positive bacterium. clostridium ragsdalei scientific classification domain: bacteria phylum: bacillota class: clostridia family: clostridiaceae genus: clostridium species: "c. ragsdalei" binomial name "clostridium ragsdalei"saxena and tanner 2011