collinsella massiliensis collinsella massiliensis collinsella massiliensis is a gram-positive, obligatory anaerobic, non-spore-forming, rod shaped and non-motile bacterium from the genus of collinsella which has been isolated from human feces from the timone hospital in france. collinsella massiliensis scientific classification domain: bacteria phylum: actinomycetota class: coriobacteriia order: coriobacteriales family: coriobacteriaceae genus: collinsella species: c. massiliensis binomial name collinsella massiliensispadmanabhan et al. 2016 type strain dsm 26110, gd3