runella defluvii runella defluvii runella defluvii is a gram-negative and rod-shaped bacterium from the genus of runella which has been isolated from activated sludge from a wastewater treatment plant in pohang in korea. runella defluvii scientific classification domain: bacteria phylum: bacteroidota class: cytophagia order: cytophagales family: spirosomaceae genus: runella species: r. defluvii binomial name runella defluviilu et al. 2007 type strain dsm 17976, emb13, kctc 12614