regiella insecticola regiella insecticola regiella insecticola is a species of bacteria, that lives as a symbiont of aphids. it shows a relationship with photorhabdus species, together with hamiltonella defensa. together with other endosymbionts, it provides aphids protection against parasitoids. regiella insecticola scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: enterobacterales family: enterobacteriaceae genus: regiella species: r. insecticola binomial name regiella insecticolamoran et al., 2005