treponema bryantii treponema bryantii treponema bryantii is a species of spirochete bacteria within the genus treponema. this species is an obligate anaerobe and is found in the rumen of cows. treponema bryantii scientific classification domain: bacteria phylum: spirochaetota class: spirochaetia order: spirochaetales family: treponemataceae genus: treponema species: t. bryantii binomial name treponema bryantiistanton and canale-parola 1980