cellular organisms >>> Bacteria >>> Pseudomonadati >>> Pseudomonadota >>> Gammaproteobacteria >>> Enterobacterales >>> Enterobacteriaceae >>> Enterobacteriaceae incertae sedis >>> ant, tsetse, mealybug, aphid, etc. endosymbionts >>> aphid secondary symbionts >>> Candidatus Williamhamiltonella >>> Candidatus Williamhamiltonella defendens >>>