广古菌门

广古菌门（学名：Euryarchaeota）包含了古菌中的大多数种类，包括了经常能在动物肠道中发现的产甲烷菌、在极高盐浓度下生活的盐杆菌、一些超嗜热的好氧和厌氧菌，也有海洋类群。在16S rRNA系统发育树上，它们组成一个单系群。

广古菌门
Halobacterium salinarum NRC-1
科学分类
域：	古菌域 Archaea
门：	广古菌门 Euryarchaeota Garrity and Holt, 2001
纲
见正文

下属分类

本门包括以下纲：

• 古球状菌纲 Archaeoglobi Garrity and Holt 2002
• 盐杆菌纲 Halobacteria Grant et al. 2002
• 甲烷杆菌纲 Methanobacteria Boone 2002
• 甲烷球菌纲 Methanococci Boone 2002
  • 甲烷球菌目 Methanococcales Balch and Wolfe 1981
    • Methanocaldococcaceae Whitman et al. 2002
      • Methanocaldococcus Whitman 2002
        • Methanocaldococcus bathoardescens Stewart et al. 2015
        • Methanocaldococcus fervens (Jeanthon et al. 1999) Whitman 2002
        • Methanocaldococcus indicus L'Haridon et al. 2003
        • Methanocaldococcus infernus (Jeanthon et al. 1998) Whitman 2002
        • Methanocaldococcus jannaschii (Jones et al. 1984) Whitman 2002
        • Methanocaldococcus lauensis L'Haridon et al. 2023^[1]
        • Methanocaldococcus villosus Bellack et al. 2011
        • Methanocaldococcus vulcanius (Jeanthon et al. 1999) Whitman 2002
      • Methanocaldococcus Boone et al. 1993
      • Methanoignis Boone et al. 1993
      • Methanotorris Whitman 2002
    • 甲烷球菌科 Methanococcaceae Balch and Wolfe 1981
      • 甲烷球菌属 Methanococcus Kluyver and van Niel 1936 (Approved Lists 1980)
      • Methanofervidicoccus Sakai et al. 2019
      • Methanothermococcus Whitman 2002
• 甲烷微菌纲 Methanomicrobia
• Methanonatronarchaeia Sorokin et al. 2018
• 甲烷火菌纲 Methanopyri Garrity and Holt 2002
• 热球菌纲 Thermococci Zillig and Reysenbach 2002
• 热原体纲 Thermoplasmata Reysenbach 2002