gellertiella hungarica gellertiella hungarica gellertiella hungarica is a species of gram-negative bacteria. gellertiella hungarica scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: hyphomicrobiales family: rhizobiaceae genus: gellertiellatóth et al. 2017 species: g. hungarica binomial name gellertiella hungaricatóth et al. 2017