procabacteriaceae procabacteriaceae "procabacteriaceae" is a candidatus family of uncultivated gram-negative betaproteobacteria. the sole genus, "procabacter", was identified as an obligate endosymbiont of acanthamoeba. procabacteriaceae scientific classification domain: bacteria phylum: pseudomonadota class: betaproteobacteria order: "procabacteriales" family: "procabacteriaceae" genus and species ca. "procabacter" ca. "procabacter acanthamoebae"