slackia slackia slackia is a genus of actinomycetota, in the family coriobacteriaceae. slackia is named after the microbiologist geoffrey slack. slackia scientific classification domain: bacteria phylum: actinomycetota class: coriobacteriia order: eggerthellales family: eggerthellaceae genus: slackiawade et al. 1999 species s. equolifaciens s. exigua s. faecicanis s. heliotrinireducens s. isoflavoniconvertens s. piriformis