cetobacterium ceti cetobacterium ceti cetobacterium ceti is a gram-negative, and rod-shaped obligately anaerobic bacterium from the genus of cetobacterium which has been isolated from sea mammals. cetobacterium ceti represents a hitherto unknown line of descent peripherally associated to the fusobacteria and low g + c relatives. there is no growth of cetobacterium ceti at 25°c or 45°c. cetobacterium ceti scientific classification domain: bacteria phylum: fusobacteriota class: fusobacteriia order: fusobacteriales family: fusobacteriaceae genus: cetobacterium species: c. ceti binomial name cetobacterium cetifoster et al. 1996 type strain atcc 700028, ncfb 3026, ncimb 703026, strain m-3333