seminibacterium seminibacterium seminibacterium is a gram-negative genus of bacteria from the family of pasteurellaceae with one known species (seminibacterium arietis). seminibacterium arietis has been isolated from the semen of a ram. seminibacterium scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: seminibacteriumvela et al. 2015 type species seminibacterium arietis species s. arietis