sphingopyxis witflariensis sphingopyxis witflariensis sphingopyxis witflariensis is a gram-negative and strictly aerobic bacterium from the genus of sphingopyxis which has been isolated from activated sludge from wetzlar in germany. sphingopyxis witflariensis scientific classification domain: bacteria phylum: pseudomonadota class: alphaproteobacteria order: sphingomonadales family: sphingomonadaceae genus: sphingopyxis species: s. witflariensis binomial name sphingopyxis witflariensiskämpfer et al. 2002 type strain cip 107174, dsm 14551, strain w-50