methanobacteriales methanobacteriales methanobacteriales is an order of archaeans in the class methanobacteria. species within this order differ from other methanogens in that they can use fewer catabolic substrates and have distinct morphological characteristics, lipid compositions, and rna sequences. their cell walls are composed of pseudomurein. most species are gram-positive with rod-shaped bodies and some can form long filaments. most of them use formate to reduce carbon dioxide, but those of the genus methanosphaera use hydrogen to reduce methanol to methane. wikispecies has information related to methanobacteriales. methanobacteriales scientific classification domain: archaea kingdom: euryarchaeota class: methanobacteria order: methanobacterialesbalch and wolfe 1981 families methanobacteriaceae methanothermaceae phylogeny the currently accepted taxonomy is based on the list of prokaryotic names with standing in nomenclature (lpsn) and national center for biotechnology information (ncbi). 16s rrna-based ltp_01_2022 53 marker proteins based gtdb 07-rs207 methanothermaceae methanothermus methanobacteriaceae methanothermobacter species-group 2 methanothermobacter methanobacterium species-group 2 methanobacterium methanosphaera methanobrevibacter methanothermus methanothermobacter species-group 2 "methanothermobacteraceae" methanothermobacter methanobacteriaceae methanobrevibacter methanobacterium species-group 2 methanosphaera methanobacterium