tahibacter caeni tahibacter caeni tahibacter caeni is a gram-negative, aerobic, non-spore-formin, rod-shaped and non-motile bacterium from the genus of tahibacter which has been isolated from activated sludge from a wastewater treatment facility. tahibacter caeni scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: lysobacterales family: rhodanobacteraceae genus: tahibacter species: t. caeni binomial name tahibacter caeniwu et al. 2015 type strain cctcc ab 2013266, kacc 17139, strain but-6