abstract:Caldithrix is a genus of thermophilic and anaerobic bacterium that are difficult to assign to any particular Eubacterial phyla. According to 'The All-Species Living Tree' Project Caldithrix is a member of Sphingobacteria,See 'The All-Species Living Tree' Project Data extracted from the whereas the LPSN assigns it as an unclassified DeferribacteralesSee the List of Prokaryotic names with Standing in Nomenclature.