methanobrevibacter wolinii methanobrevibacter wolinii methanobrevibacter wolinii is a species of methanogen archaeon, named after meyer j. wolin. methanobrevibacter wolinii scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: methanobacteria order: methanobacteriales family: methanobacteriaceae genus: methanobrevibacter species: m. woliniimiller and lin, 2002 description coccobacillus with slightly tapered ends, about t 0.6 micrometres in width and 1.0-1.4 micrometres in length, occurring in pairs or short chains. gram-positive reaction. its cell walls are composed of pseudomurein. it is a strict anaerobe and its type strain is sht (=dsm 11976t =ocm 814t). it was first isolated from sheep faeces.