holosporales holosporales the holosporales are an order of bacteria. holosporales scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria subclass: caulobacteridae order: holosporalesszokoli et al. 2020 families "caedimonadaceae" schrallhammer et al. 2018 "candidatus hepatincolaceae" szokoli et al. 2016 holosporaceae görtz and schmidt 2006 "candidatus paracaedibacteraceae" hess et al. 2016