parabacteroides goldsteinii parabacteroides goldsteinii parabacteroides goldsteinii is a gram-negative, obligately anaerobic non-spore-forming and non-motile bacterium from the genus of parabacteroides which has been isolated from human blood. parabacteroides goldsteinii scientific classification domain: bacteria phylum: bacteroidota class: bacteroidia order: bacteroidales family: "tannerellaceae" genus: parabacteroides species: p. goldsteinii binomial name parabacteroides goldsteinii(song et al. 2006) sakamoto and benno 2006