| Hamiltonella | |
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| Genus: | Candidatus Hamiltonella Moran et al., 2005 |
Hamiltonella is a genus of Enterobacteria in the Gammaproteobacteria. Hamiltonella defensa is a model organism for defensive symbiosis, protecting pea aphids from parasitoid wasps. Hamiltonella has also been found as a nutritional mutualistic endosymbiont in Whiteflies.