bartonella callosciuri bartonella callosciuri bartonella callosciuri is a bacterium from the genus bartonella. bartonella callosciuri scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: bartonellaceae genus: bartonella species: b. callosciuri binomial name bartonella callosciurisato et al. 2013