<?xml version="1.0" ?>
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<taxon doi="10.1601/tx.228" rank="genus" xmlns="http://namesforlife.com/ns/taxon">
  <nomenclature xmlns="http://namesforlife.com/ns/common">
    <name-status-group>
      <identifier doi="10.1601/nm.228" nomenclatural-type="10.1601/tx.229" nomenclatural-type-exemplar="10.1601/ex.229" rank="genus" taxon-doi="10.1601/tx.228">Methanosarcina</identifier>
      <authority>Kluyver and van Niel 1936 (Approved Lists 1980) emend. Ni et al. 1994</authority>
      <status candidatus="false" conserved="true" current-name="Methanosarcina" current-name-doi="10.1601/nm.228" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
    </name-status-group>
  </nomenclature>
  <nomenclatural-type nomenclatural-type-exemplar="10.1601/ex.229" xmlns="http://namesforlife.com/ns/common">
    <name-status-group>
      <identifier doi="10.1601/nm.229" nomenclatural-type-exemplar="10.1601/ex.229" rank="species" taxon-doi="10.1601/tx.229">Methanosarcina barkeri</identifier>
      <authority>Schnellen 1947 (Approved Lists 1980) emend. Maestrojuán et al. 1992</authority>
      <status candidatus="false" conserved="true" current-name="Methanosarcina barkeri" current-name-doi="10.1601/nm.229" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
    </name-status-group>
  </nomenclatural-type>
  <taxonomic-equivalence>
    <related-taxon accession="2207" nomos="NCBI Taxonomy" rank="genus" relation="exactMatch" />
  </taxonomic-equivalence>
  <ancestor doi="10.1601/tx.0" rank="root">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.0" rank="root" taxon-doi="10.1601/tx.0">Universal Root</identifier>
        <authority>Woese et al. 1990</authority>
        <status candidatus="false" conserved="false" current-name="Universal Root" current-name-doi="10.1601/nm.0" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="NVP" />
      </name-status-group>
    </nomenclature>
    <ancestor doi="10.1601/tx.1" rank="domain">
      <nomenclature xmlns="http://namesforlife.com/ns/common">
        <name-status-group>
          <identifier doi="10.1601/nm.1" rank="domain" taxon-doi="10.1601/tx.1">Archaea</identifier>
          <authority>Woese et al. 1990</authority>
          <status candidatus="false" conserved="false" current-name="Archaea" current-name-doi="10.1601/nm.1" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="NVP" />
        </name-status-group>
      </nomenclature>
      <ancestor doi="10.1601/tx.90" rank="phylum">
        <nomenclature xmlns="http://namesforlife.com/ns/common">
          <name-status-group>
            <identifier doi="10.1601/nm.90" nomenclatural-type="10.1601/tx.94" nomenclatural-type-exemplar="10.1601/ex.95" rank="phylum" taxon-doi="10.1601/tx.90">Euryarchaeota</identifier>
            <authority>(sic) Garrity and Holt 2001</authority>
            <status candidatus="false" conserved="false" current-name="Methanobacteriota" current-name-doi="10.1601/nm.31627" illegitimate="false" is-current="false" rejected="false" revived="false" status-code="NVP" />
          </name-status-group>
          <name-status-group>
            <identifier doi="10.1601/nm.31627" nomenclatural-type="10.1601/tx.94" nomenclatural-type-exemplar="10.1601/ex.95" rank="phylum" taxon-doi="10.1601/tx.90">Methanobacteriota</identifier>
            <authority>corrig. Garrity and Holt 2001</authority>
            <status candidatus="false" conserved="false" current-name="Methanobacteriota" current-name-doi="10.1601/nm.31627" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="NVP" />
          </name-status-group>
        </nomenclature>
        <ancestor doi="10.1601/tx.143" rank="class">
          <nomenclature xmlns="http://namesforlife.com/ns/common">
            <name-status-group>
              <identifier doi="10.1601/nm.143" nomenclatural-type="10.1601/tx.144" nomenclatural-type-exemplar="10.1601/ex.147" rank="class" taxon-doi="10.1601/tx.143">Methanococci</identifier>
              <authority>Boone 2002</authority>
              <status candidatus="false" conserved="false" current-name="Methanococci" current-name-doi="10.1601/nm.143" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
            </name-status-group>
          </nomenclature>
          <ancestor doi="10.1601/tx.226" rank="order">
            <nomenclature xmlns="http://namesforlife.com/ns/common">
              <name-status-group>
                <identifier doi="10.1601/nm.226" nomenclatural-type="10.1601/tx.228" nomenclatural-type-exemplar="10.1601/ex.229" rank="order" taxon-doi="10.1601/tx.226">Methanosarcinales</identifier>
                <authority>Boone et al. 2002</authority>
                <status candidatus="false" conserved="false" current-name="Methanosarcinales" current-name-doi="10.1601/nm.226" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
              </name-status-group>
            </nomenclature>
            <ancestor doi="10.1601/tx.227" rank="family">
              <nomenclature xmlns="http://namesforlife.com/ns/common">
                <name-status-group>
                  <identifier doi="10.1601/nm.227" nomenclatural-type="10.1601/tx.228" nomenclatural-type-exemplar="10.1601/ex.229" rank="family" taxon-doi="10.1601/tx.227">Methanosarcinaceae</identifier>
                  <authority>Balch and Wolfe 1981 emend. Sowers et al. 1984</authority>
                  <status candidatus="false" conserved="false" current-name="Methanosarcinaceae" current-name-doi="10.1601/nm.227" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
                </name-status-group>
              </nomenclature>
              <ancestor doi="10.1601/tx.228" rank="genus">
                <nomenclature xmlns="http://namesforlife.com/ns/common">
                  <name-status-group>
                    <identifier doi="10.1601/nm.228" nomenclatural-type="10.1601/tx.229" nomenclatural-type-exemplar="10.1601/ex.229" rank="genus" taxon-doi="10.1601/tx.228">Methanosarcina</identifier>
                    <authority>Kluyver and van Niel 1936 (Approved Lists 1980) emend. Ni et al. 1994</authority>
                    <status candidatus="false" conserved="true" current-name="Methanosarcina" current-name-doi="10.1601/nm.228" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
                  </name-status-group>
                </nomenclature>
              </ancestor>
            </ancestor>
          </ancestor>
        </ancestor>
      </ancestor>
    </ancestor>
  </ancestor>
  <parent doi="10.1601/tx.227" rank="family">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.227" nomenclatural-type="10.1601/tx.228" nomenclatural-type-exemplar="10.1601/ex.229" rank="family" taxon-doi="10.1601/tx.227">Methanosarcinaceae</identifier>
        <authority>Balch and Wolfe 1981 emend. Sowers et al. 1984</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcinaceae" current-name-doi="10.1601/nm.227" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </parent>
  <sibling doi="10.1601/tx.243" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.243" nomenclatural-type="10.1601/tx.244" nomenclatural-type-exemplar="10.1601/ex.244" rank="genus" taxon-doi="10.1601/tx.243">Methanohalobium</identifier>
        <authority>Zhilina and Zavarzin 1988</authority>
        <status candidatus="false" conserved="false" current-name="Methanohalobium" current-name-doi="10.1601/nm.243" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.262" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.262" nomenclatural-type="10.1601/tx.263" nomenclatural-type-exemplar="10.1601/ex.250" rank="genus" taxon-doi="10.1601/tx.262">Methanosalsum</identifier>
        <authority>Boone and Baker 2002</authority>
        <status candidatus="false" conserved="false" current-name="Methanosalsum" current-name-doi="10.1601/nm.262" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.251" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.251" nomenclatural-type="10.1601/tx.252" nomenclatural-type-exemplar="10.1601/ex.252" rank="genus" taxon-doi="10.1601/tx.251">Methanolobus</identifier>
        <authority>König and Stetter 1983</authority>
        <status candidatus="false" conserved="false" current-name="Methanolobus" current-name-doi="10.1601/nm.251" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.245" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.245" nomenclatural-type="10.1601/tx.246" nomenclatural-type-exemplar="10.1601/ex.246" rank="genus" taxon-doi="10.1601/tx.245">Methanohalophilus</identifier>
        <authority>Paterek and Smith 1988 emend. Katayama et al. 2014</authority>
        <status candidatus="false" conserved="false" current-name="Methanohalophilus" current-name-doi="10.1601/nm.245" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.258" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.258" nomenclatural-type="10.1601/tx.259" nomenclatural-type-exemplar="10.1601/ex.259" rank="genus" taxon-doi="10.1601/tx.258">Methanomethylovorans</identifier>
        <authority>Lomans et al. 2004</authority>
        <status candidatus="false" conserved="false" current-name="Methanomethylovorans" current-name-doi="10.1601/nm.258" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.240" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.240" nomenclatural-type="10.1601/tx.241" nomenclatural-type-exemplar="10.1601/ex.241" rank="genus" taxon-doi="10.1601/tx.240">Methanococcoides</identifier>
        <authority>Sowers and Ferry 1985 emend. L'Haridon et al. 2014</authority>
        <status candidatus="false" conserved="false" current-name="Methanococcoides" current-name-doi="10.1601/nm.240" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.260" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.260" nomenclatural-type="10.1601/tx.261" nomenclatural-type-exemplar="10.1601/ex.261" rank="genus" taxon-doi="10.1601/tx.260">Methanimicrococcus</identifier>
        <authority>corrig. Sprenger et al. 2000</authority>
        <status candidatus="false" conserved="false" current-name="Methanimicrococcus" current-name-doi="10.1601/nm.260" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
      <name-status-group>
        <identifier doi="10.1601/nm.10343" nomenclatural-type="10.1601/tx.261" nomenclatural-type-exemplar="10.1601/ex.261" rank="genus" taxon-doi="10.1601/tx.260">Methanomicrococcus</identifier>
        <authority>(sic) Sprenger et al. 2000</authority>
        <status candidatus="false" conserved="false" current-name="Methanimicrococcus" current-name-doi="10.1601/nm.260" illegitimate="false" is-current="false" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <sibling doi="10.1601/tx.10389" rank="genus">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.10389" nomenclatural-type="10.1601/tx.10766" nomenclatural-type-exemplar="10.1601/ex.10766" rank="genus" taxon-doi="10.1601/tx.10389">Halomethanococcus</identifier>
        <authority>Yu and Kawamura 1988</authority>
        <status candidatus="false" conserved="false" current-name="Halomethanococcus" current-name-doi="10.1601/nm.10389" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </sibling>
  <child doi="10.1601/tx.235" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.235" nomenclatural-type-exemplar="10.1601/ex.235" rank="species" taxon-doi="10.1601/tx.235">Methanosarcina methanica</identifier>
        <authority>(Smit 1930) Kluyver and van Niel 1936 (Approved Lists 1980)</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina methanica" current-name-doi="10.1601/nm.235" illegitimate="false" is-current="true" rejected="true" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.238" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.238" nomenclatural-type-exemplar="10.1601/ex.238" rank="species" taxon-doi="10.1601/tx.238">Methanosarcina thermophila</identifier>
        <authority>Zinder et al. 1985</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina thermophila" current-name-doi="10.1601/nm.238" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.25882" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.25882" nomenclatural-type-exemplar="10.1601/ex.25882" rank="species" taxon-doi="10.1601/tx.25882">Methanosarcina spelaei</identifier>
        <authority>Ganzert et al. 2014</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina spelaei" current-name-doi="10.1601/nm.25882" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.26544" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.26544" nomenclatural-type-exemplar="10.1601/ex.26544" rank="species" taxon-doi="10.1601/tx.26544">Methanosarcina subterranea</identifier>
        <authority>Shimizu et al. 2015</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina subterranea" current-name-doi="10.1601/nm.26544" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.231" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.231" nomenclatural-type-exemplar="10.1601/ex.231" rank="species" taxon-doi="10.1601/tx.231">Methanosarcina baltica</identifier>
        <authority>von Klein et al. 2002 emend. Singh et al. 2005</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina baltica" current-name-doi="10.1601/nm.231" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.237" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.237" nomenclatural-type-exemplar="10.1601/ex.255" rank="species" taxon-doi="10.1601/tx.237">Methanosarcina siciliae</identifier>
        <authority>(Stetter and König 1989) Ni et al. 1994 emend. Elberson and Sowers 1997</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina siciliae" current-name-doi="10.1601/nm.237" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.232" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.232" nomenclatural-type-exemplar="10.1601/ex.150" rank="species" taxon-doi="10.1601/tx.232">Methanosarcina frisia</identifier>
        <authority>(Blotevogel et al. 1986) Blotevogel and Fischer 1989</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina frisia" current-name-doi="10.1601/nm.232" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.236" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.236" nomenclatural-type-exemplar="10.1601/ex.236" rank="species" taxon-doi="10.1601/tx.236">Methanosarcina semesiae</identifier>
        <authority>Lyimo et al. 2000</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina semesiae" current-name-doi="10.1601/nm.236" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.230" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.230" nomenclatural-type-exemplar="10.1601/ex.230" rank="species" taxon-doi="10.1601/tx.230">Methanosarcina acetivorans</identifier>
        <authority>Sowers et al. 1986</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina acetivorans" current-name-doi="10.1601/nm.230" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.229" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.229" nomenclatural-type-exemplar="10.1601/ex.229" rank="species" taxon-doi="10.1601/tx.229">Methanosarcina barkeri</identifier>
        <authority>Schnellen 1947 (Approved Lists 1980) emend. Maestrojuán et al. 1992</authority>
        <status candidatus="false" conserved="true" current-name="Methanosarcina barkeri" current-name-doi="10.1601/nm.229" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.19739" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.19739" rank="species" taxon-doi="10.1601/tx.19739">Methanosarcina sp.</identifier>
        <authority>None 2015</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina sp." current-name-doi="10.1601/nm.19739" illegitimate="true" is-current="true" rejected="false" revived="false" status-code="NVP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.22595" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.22595" nomenclatural-type-exemplar="10.1601/ex.22595" rank="species" taxon-doi="10.1601/tx.22595">Methanosarcina horonobensis</identifier>
        <authority>Shimizu et al. 2011</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina horonobensis" current-name-doi="10.1601/nm.22595" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.239" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.239" nomenclatural-type-exemplar="10.1601/ex.239" rank="species" taxon-doi="10.1601/tx.239">Methanosarcina vacuolata</identifier>
        <authority>Zhilina and Zavarzin 1987</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina vacuolata" current-name-doi="10.1601/nm.239" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.233" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.233" nomenclatural-type-exemplar="10.1601/ex.233" rank="species" taxon-doi="10.1601/tx.233">Methanosarcina lacustris</identifier>
        <authority>Simankova et al. 2002</authority>
        <status candidatus="false" conserved="false" current-name="Methanosarcina lacustris" current-name-doi="10.1601/nm.233" illegitimate="false" is-current="true" rejected="false" revived="false" status-code="VP" />
      </name-status-group>
    </nomenclature>
  </child>
  <child doi="10.1601/tx.234" rank="species">
    <nomenclature xmlns="http://namesforlife.com/ns/common">
      <name-status-group>
        <identifier doi="10.1601/nm.234" nomenclatural-type-exemplar="10.1601/ex.156" rank="species" taxon-doi="10.1601/tx.234">Methanosarcina mazei</identifier>
        <authority>(Barker 1936) Mah and Kuhn 1984</authority>
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