nocardioides caeni nocardioides caeni nocardioides caeni is a gram-positive and non-motile bacterium from the genus nocardioides that has been isolated from sludge from domestic wastewater in daejeon, south korea. nocardioides caeni scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: propionibacteriales family: nocardioidaceae genus: nocardioides species: n. caeni binomial name nocardioides caeniyoon et al. 2009 type strain ccug 57506kctc 19600mn8