pelagibacteraceae pelagibacteraceae the pelagibacteraceae are a family in the alphaproteobacteria composed of free-living marine bacteria. "pelagibacteraceae" scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria subclass: rickettsidae order: pelagibacteralesthrash et al. 2011 family: "pelagibacteraceae" genera candidatus allofontibacter corrig. tsementzi et al. 2019 candidatus fonsibacter henson et al. 2018 candidatus pelagibacter rappe et al. 2002