methanobrevibacter curvatus methanobrevibacter curvatus methanobrevibacter curvatus is a species of methanogen archaeon. it was first isolated from the hindgut of the termite reticulitermes flavipes. it is rod-shaped, ranging in size from 0.34 to 1.6 µm and possesses polar fibers. its morphology, gram-positive staining reaction, resistance to cell lysis by chemical agents and narrow range of utilisable substrates are typical of species belonging to the family methanobacteriaceae. it habitates on or near the hindgut epithelium and also attached to filamentous prokaryotes associated with the gut wall. it is one of the predominant gut biota. methanobrevibacter curvatus scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: methanobacteria order: methanobacteriales family: methanobacteriaceae genus: methanobrevibacter species: m. curvatusleadbetter & breznak, 1996