methanococcales methanococcales in taxonomy, the methanococcales are an order of the methanococci. methanococcales scientific classification domain: archaea kingdom: euryarchaeota phylum: euryarchaeota class: methanococci order: methanococcalesbalch and wolfe 1981 families methanocaldococcaceae whitman et al. 2002 methanococcaceae balch and wolfe 1981 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 methanocaldococcaceae methanocaldococcus methanotorris methanococcaceae methanofervidicoccus methanothermococcus thermolithotrophicus methanococcus methanocaldococcaceae methanocaldococcus whitman 2002 methanococcaceae methanotorris whitman 2002 methanofervidicoccus sakai et al. 2019 methanothermococcus okinawensis takai et al. 2002 methanococcus aeolicus kendall et al. 2006 methanothermococcus thermolithotrophicus (huber et al. 1984) whitman 2002 (type sp.) methanococcus kluyver & van niel 1936