moraxellaceae moraxellaceae the moraxellaceae are a family of gammaproteobacteria, including a few pathogenic species. others are harmless commensals of mammals and humans or occur in water or soil. the species are mesophilic or psychrotrophic (psychrobacter). moraxellaceae acinetobacter baumannii scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: moraxellaceaerossau et al. 1991 genus acinetobacter alkanindiges branhamella (taxonomically invalid) cavicella faucicola fluviicoccus moraxella paraperlucidibaca perlucidibaca psychrobacter moraxella catarrhalis and acinetobacter baumannii are human pathogens, and moraxella bovis is the cause of "pinkeye" of cattle (infectious bovine keratoconjunctivitis).