mannheimia mannheimia mannheimia is a gram-negative, anaerobic, non-spore-forming and non-motile bacterial genus from the family pasteurellaceae. mannheimia scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: mannheimiaangen et al. 1999 type species mannheimia haemolytica species m. caviae m. glucosida m. granulomatis m. haemolytica m. ruminalis m. varigena