slackia piriformis slackia piriformis slackia piriformis is a gram-positive, strictly anaerobic, non-spore-forming and rod-shaped bacterium from the genus of slackia which has been isolated from human faeces from tokyo in japan. slackia piriformis scientific classification domain: bacteria phylum: actinomycetota class: coriobacteriia order: eggerthellales family: eggerthellaceae genus: slackia species: s. piriformis binomial name slackia piriformisnagai et al. 2010 type strain dsm 22477, jcm 16070, yit 12062