tessaracoccus massiliensis tessaracoccus massiliensis "tessaracoccus massiliensis" is a gram-positive, facultatively anaerobic, rod-shaped, non-spore-forming and non-motile bacterium from the genus tessaracoccus which has been isolated from the human gut of a nigerian child suffering from kwashiorkor. tessaracoccus massiliensis scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: propionibacteriales family: propionibacteriaceae genus: tessaracoccus species: t. massiliensis binomial name tessaracoccus massiliensisseck et al. 2016 type strain csur p1301dsm 29060sit-7