|   | 
|  Kingdom Bacteria | 
|   | 
Acanthopleuribacteraceae Fukunaga et al., 2008 -- valid | 
|   | 
Acetobacteraceae (ex Henrici, 1939) Gillis and De Ley, 1980 -- valid | 
|   | 
Acholeplasmataceae Edward and Freundt, 1970 -- valid | 
|   | 
Acidaminococcaceae Marchandin et al., 2010 -- valid | 
|   | 
Acidimicrobiaceae Stackebrandt et al., 1997 -- valid | 
|   | 
Acidimicrobineae Garrity and Holt, 2001 -- valid | 
|   | 
Acidithiobacillaceae Garrity et al., 2005 -- valid | 
|   | 
Acidobacteriaceae Thrash and Coates, 2012 -- valid | 
|   | 
Acidothermaceae Rainey et al., 1997 -- valid | 
|   | 
Actinomycetaceae Buchanan, 1918 -- valid | 
|   | 
Actinomycineae Stackebrandt et al., 1997 -- valid | 
|   | 
Actinopolysporaceae Zhi et al., 2009 -- valid | 
|   | 
Actinopolysporineae Zhi et al., 2009 -- valid | 
|   | 
Actinospicaceae Cavaletti et al., 2006 -- valid | 
|   | 
Actinosynnemataceae Labeda and Kroppenstedt, 2000 -- valid | 
|   | 
Aerococcaceae Ludwig et al., 2010 -- valid | 
|   | 
Aeromonadaceae Colwell et al., 1986 -- valid | 
|   | 
Akkermansiaceae Hedlund and Derrien, 2012 -- valid | 
|   | 
Alcaligenaceae De Ley et al., 1986 -- valid | 
|   | 
Alcanivoracaceae corrig. Golyshin et al., 2005 -- valid | 
|   | 
Alicyclobacillaceae da Costa and Rainey, 2010 -- valid | 
|   | 
Alteromonadaceae Ivanova and Mikhailov, 2001 -- valid | 
|   | 
Anaerolineaceae -- valid | 
|   | 
Anaeroplasmataceae Robinson and Freundt, 1987 -- valid | 
|   | 
Anaplasmataceae Philip, 1957 -- valid | 
|   | 
Aquificaceae Reysenbach, 2002 -- valid | 
|   | 
Armatimonadaceae Tamaki et al., 2011 -- valid | 
|   | 
Aurantimonadaceae Garrity et al., 2003 -- valid | 
|   | 
Bacillaceae Fischer, 1895 -- valid | 
|   | 
Bacteriovoracaceae Davidov and Jurkevitch, 2004 -- valid | 
|   | 
Bacteroidaceae Pribram, 1933 -- valid | 
|   | 
Bartonellaceae Gieszczykiewicz, 1939 -- valid | 
|   | 
Bdellovibrionaceae Garrity et al., 2006 -- valid | 
|   | 
Beijerinckiaceae Garrity et al., 2006 -- valid | 
|   | 
Beutenbergiaceae Zhi et al., 2009 -- valid | 
|   | 
Bifidobacteriaceae Stackebrandt et al., 1997 -- valid | 
|   | 
Blattabacteriaceae Kambhampati, 2012 -- valid | 
|   | 
Bogoriellaceae Schumann and Stackebrandt, 2000 -- valid | 
|   | 
Brachyspiraceae Paster, 2012 -- valid | 
|   | 
Bradyrhizobiaceae Garrity et al., 2006 -- valid | 
|   | 
Brevibacteriaceae Breed, 1953 -- valid | 
|   | 
Brevinemataceae Paster, 2012 -- valid | 
|   | 
Brucellaceae Breed et al., 1957 -- valid | 
|   | 
Burkholderiaceae Garrity et al., 2006 -- valid | 
|   | 
Caldicoprobacteraceae -- valid | 
|   | 
Caldilineaceae Yamada et al., 2006 -- valid | 
|   | 
Caldisericaceae Mori et al., 2009 -- valid | 
|   | 
Campylobacteraceae Vandamme and De Ley, 1991 -- valid | 
|   | 
Cardiobacteriaceae Dewhirst et al., 1990 -- valid | 
|   | 
Carnobacteriaceae Ludwig et al., 2010 -- valid | 
|   | 
Catenulisporaceae Busti et al., 2006 -- valid | 
|   | 
Catenulisporineae Cavaletti et al., 2006 -- valid | 
|   | 
Caulobacteraceae Henrici and Johnson, 1935 -- valid | 
|   | 
Celerinatantimonadaceae Cramer et al., 2011 -- valid | 
|   | 
Cellulomonadaceae Stackebrandt and Prauser, 1991 -- valid | 
|   | 
Chitinophagaceae Kämpfer et al., 2011 -- valid | 
|   | 
Chlamydiaceae Rake, 1957 -- valid | 
|   | 
Chlorobiaceae Copeland, 1956 -- valid | 
|   | 
Chloroflexaceae Gupta et al., 2013 -- valid | 
|   | 
Christensenellaceae -- valid | 
|   | 
Chromatiaceae Bavendamm, 1924 -- valid | 
|   | 
Chrysiogenaceae Garrity and Holt, 2002 -- valid | 
|   | 
Chthonomonadaceae Lee et al., 2011 -- valid | 
|   | 
Clostridiaceae Pribram, 1933 -- valid | 
|   | 
Cohaesibacteraceae Hwang and Cho, 2008 -- valid | 
|   | 
Colwelliaceae Ivanova et al., 2004 -- valid | 
|   | 
Comamonadaceae Willems et al., 1991 -- valid | 
|   | 
Conexibacteraceae Stackebrandt, 2005 -- valid | 
|   | 
Coriobacteriaceae Stackebrandt et al., 1997 -- valid | 
|   | 
Coriobacterineae Garrity and Holt, 2001 -- valid | 
|   | 
Corynebacteriaceae Lehmann and Neumann, 1907 -- valid | 
|   | 
Corynebacterineae Stackebrandt et al., 1997 -- valid | 
|   | 
Coxiellaceae Garrity et al., 2005 -- valid | 
|   | 
Crenotrichaceae Hansgirg, 1888 -- valid | 
|   | 
Cryomorphaceae Bowman et al., 2003 -- valid | 
|   | 
Cryptosporangiaceae Zhi et al., 2009 -- valid | 
|   | 
Cyclobacteriaceae Nedashkovskaya and Ludwig, 2012 -- valid | 
|   | 
Cystobacteraceae McCurdy, 1970 -- valid | 
|   | 
Cystobacterineae Reichenbach, 2007 -- valid | 
|   | 
Cytophagaceae Stanier, 1940 -- valid | 
|   | 
Deferribacteraceae Huber and Stetter, 2002 -- valid | 
|   | 
Defluviitaleaceae -- valid | 
|   | 
Deinococcaceae Brooks and Murray, 1981 -- valid | 
|   | 
Demequinaceae Ue et al., 2011 -- valid | 
|   | 
Dermabacteraceae Stackebrandt et al., 1997 -- valid | 
|   | 
Dermacoccaceae Schumann and Stackebrandt, 2000 -- valid | 
|   | 
Dermatophilaceae Austwick, 1958 -- valid | 
|   | 
Desulfarculaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfobacteraceae Kuever et al., 2006 -- valid | 
|   | 
Desulfobulbaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfohalobiaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfomicrobiaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfonatronaceae corrig. Kuever et al., 2006 -- valid | 
|   | 
Desulfovibrionaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfurellaceae Kuever et al., 2006 -- valid | 
|   | 
Desulfurobacteriaceae L'Haridon et al., 2006 -- valid | 
|   | 
Desulfuromonadaceae corrig. Kuever et al., 2006 -- valid | 
|   | 
Dictyoglomaceae Patel, 2012 -- valid | 
|   | 
Dietziaceae Rainey et al., 1997 -- valid | 
|   | 
Ectothiorhodospiraceae Imhoff, 1984 -- valid | 
|   | 
Elusimicrobiaceae Geissinger et al., 2010 -- valid | 
|   | 
Enterobacteriaceae Rahn, 1937 -- valid | 
|   | 
Enterococcaceae Ludwig et al., 2010 -- valid | 
|   | 
Entomoplasmataceae Tully et al., 1993 -- valid | 
|   | 
Erysipelotrichaceae Verbarg et al., 2004 -- valid | 
|   | 
Erythrobacteraceae -- valid | 
|   | 
Eubacteriaceae -- valid | 
|   | 
Euzebyaceae Kurahashi et al., 2010 -- valid | 
|   | 
Ferrimonadaceae Ivanova et al., 2004 -- valid | 
|   | 
Fibrobacteraceae Spain et al., 2012 -- valid | 
|   | 
Flammeovirgaceae Yoon et al., 2011 -- valid | 
|   | 
Flavobacteriaceae Reichenbach et al., 1992 -- valid | 
|   | 
Francisellaceae Sjöstedt, 2005 -- valid | 
|   | 
Frankiaceae Becking, 1970 -- valid | 
|   | 
Frankineae Stackebrandt et al., 1997 -- valid | 
|   | 
Fusobacteriaceae Staley and Whitman, 2012 -- valid | 
|   | 
Gaiellaceae Albuquerque et al., 2012 -- valid | 
|   | 
Gallionellaceae Henrici and Johnson, 1935 -- valid | 
|   | 
Gemmatimonadaceae Zhang et al., 2003 -- valid | 
|   | 
Geobacteraceae Garrity et al., 2006 -- valid | 
|   | 
Geodermatophilaceae Normand, 2006 -- valid | 
|   | 
Glycomycetaceae Rainey et al., 1997 -- valid | 
|   | 
Glycomycineae Rainey et al., 1997 -- valid | 
|   | 
Gordoniaceae Rainey et al., 1997 -- invalid | 
|   | 
Gracilibacteraceae -- valid | 
|   | 
Granulosicoccaceae Lee et al., 2008 -- valid | 
|   | 
Hahellaceae Garrity et al., 2005 -- valid | 
|   | 
Halanaerobiaceae corrig. Oren et al., 1984 -- valid | 
|   | 
Haliangiaceae Garrity et al., 2003 -- valid | 
|   | 
Halobacteroidaceae Zhilina and Rainey, 1995 -- valid | 
|   | 
Halomonadaceae Franzmann et al., 1989 -- valid | 
|   | 
Haloplasmataceae Rainey et al., 2008 -- valid | 
|   | 
Halothiobacillaceae Kelly and Wood, 2005 -- valid | 
|   | 
Helicobacteraceae Garrity et al., 2006 -- valid | 
|   | 
Heliobacteriaceae -- valid | 
|   | 
Herpetosiphonaceae Gupta et al., 2013 -- valid | 
|   | 
Holophagaceae Fukunaga et al., 2008 -- valid | 
|   | 
Holosporaceae Görtz and Schmidt, 2006 -- valid | 
|   | 
Hydrogenimonaceae Garrity et al., 2004 -- valid | 
|   | 
Hydrogenophilaceae Garrity et al., 2006 -- valid | 
|   | 
Hydrogenothermaceae Eder and Huber, 2003 -- valid | 
|   | 
Hyphomicrobiaceae Babudieri, 1950 -- valid | 
|   | 
Hyphomonadaceae Lee et al., 2005 -- valid | 
|   | 
Iamiaceae Kurahashi et al., 2009 -- valid | 
|   | 
Idiomarinaceae Ivanova et al., 2004 -- valid | 
|   | 
Ignavibacteriaceae -- valid | 
|   | 
Intrasporangiaceae Rainey et al., 1997 -- valid | 
|   | 
Jiangellaceae Tang et al., 2011 -- valid | 
|   | 
Jiangellineae Tang et al., 2011 -- valid | 
|   | 
Jonesiaceae Stackebrandt et al., 1997 -- valid | 
|   | 
Kiloniellaceae Wiese et al., 2009 -- valid | 
|   | 
Kineosporiaceae Zhi et al., 2009 -- valid | 
|   | 
Kineosporiineae Zhi et al., 2009 -- valid | 
|   | 
Kofleriaceae Reichenbach, 2007 -- valid | 
|   | 
Kordiimonadaceae Kwon et al., 2005 -- valid | 
|   | 
Ktedonobacteraceae corrig. Cavaletti et al., 2007 -- valid | 
|   | 
Lachnospiraceae -- valid | 
|   | 
Lactobacillaceae Winslow et al., 1917 -- valid | 
|   | 
Legionellaceae Brenner et al., 1979 -- valid | 
|   | 
Lentisphaeraceae Cho and Hedlund, 2012 -- valid | 
|   | 
Leptospiraceae Hovind-Hougen, 1979 -- valid | 
|   | 
Leptotrichiaceae Staley and Whitman, 2012 -- valid | 
|   | 
Leuconostocaceae Schleifer, 2010 -- valid | 
|   | 
Listeriaceae Ludwig et al., 2010 -- valid | 
|   | 
Litoricolaceae Kim et al., 2007 -- valid | 
|   | 
Marinilabiliaceae Ludwig et al., 2012 -- valid | 
|   | 
Mariprofundaceae Emerson et al., 2007 -- valid | 
|   | 
Methylobacteriaceae Garrity et al., 2006 -- valid | 
|   | 
Methylococcaceae Whittenbury and Krieg, 1984 -- valid | 
|   | 
Methylocystaceae Bowman, 2006 -- valid | 
|   | 
Methylophilaceae Garrity et al., 2006 -- valid | 
|   | 
Microbacteriaceae Park et al., 1995 -- valid | 
|   | 
Micrococcaceae Pribram, 1929 -- valid | 
|   | 
Micrococcineae Stackebrandt et al., 1997 -- valid | 
|   | 
Micromonosporaceae Krasil'nikov, 1938 -- valid | 
|   | 
Micromonosporineae Stackebrandt et al., 1997 -- valid | 
|   | 
Moraxellaceae Rossau et al., 1991 -- valid | 
|   | 
Moritellaceae Ivanova et al., 2004 -- valid | 
|   | 
Mycobacteriaceae Chester, 1897 -- valid | 
|   | 
Mycoplasmataceae Freundt, 1955 -- valid | 
|   | 
Myxococcaceae Jahn, 1924 -- valid | 
|   | 
Nakamurellaceae Tao et al., 2004 -- valid | 
|   | 
Nannocystaceae Reichenbach, 2006 -- valid | 
|   | 
Nannocystineae Reichenbach, 2007 -- valid | 
|   | 
Natranaerobiaceae Mesbah et al., 2007 -- valid | 
|   | 
Nautiliaceae Miroshnichenko et al., 2004 -- valid | 
|   | 
Neisseriaceae Prévot, 1933 -- valid | 
|   | 
Nevskiaceae Henrici and Johnson, 1935 -- valid | 
|   | 
Nitriliruptoraceae Sorokin et al., 2009 -- valid | 
|   | 
Nitrosomonadaceae Garrity et al., 2006 -- valid | 
|   | 
Nitrospinaceae Garrity et al., 2006 -- valid | 
|   | 
Nitrospiraceae Garrity and Holt, 2001 -- valid | 
|   | 
Nocardiaceae Castellani and Chalmers, 1919 emend. Rainey et al., 1997 emend. Zhi et al., 2009 -- valid | 
|   | 
Nocardioidaceae Nesterenko et al., 1990 -- valid | 
|   | 
Nocardiopsaceae Rainey et al., 1996 -- valid | 
|   | 
Oceanospirillaceae Garrity et al., 2005 -- valid | 
|   | 
Oleiphilaceae Golyshin et al., 2002 -- valid | 
|   | 
Opitutaceae Choo et al., 2007 -- valid | 
|   | 
Oscillochloridaceae Keppen et al., 2000 -- valid | 
|   | 
Oscillospiraceae -- valid | 
|   | 
Oxalobacteraceae Garrity et al., 2006 -- valid | 
|   | 
Paenibacillaceae De Vos et al., 2010 -- valid | 
|   | 
Parachlamydiaceae Everett et al., 1999 -- valid | 
|   | 
Parvularculaceae Garrity et al., 2003 -- valid | 
|   | 
Pasteurellaceae Pohl, 1981 -- valid | 
|   | 
Pasteuriaceae Laurent, 1890 -- valid | 
|   | 
Patulibacteraceae Takahashi et al., 2006 -- valid | 
|   | 
Peptococcaceae -- valid | 
|   | 
Peptostreptococcaceae -- valid | 
|   | 
Peredibacteraceae Pińeiro et al., 2008 -- invalid | 
|   | 
Phaselicystidaceae Garcia et al., 2009 -- valid | 
|   | 
Phycisphaeraceae Fukunaga et al., 2010 -- valid | 
|   | 
Phyllobacteriaceae Mergaert and Swings, 2006 -- valid | 
|   | 
Piscirickettsiaceae Fryer and Lannan, 2005 -- valid | 
|   | 
Planctomycetaceae Schlesner and Stackebrandt, 1987 -- valid | 
|   | 
Planococcaceae Krasil'nikov, 1949 -- valid | 
|   | 
Polyangiaceae Jahn, 1924 -- valid | 
|   | 
Porphyromonadaceae Krieg, 2012 -- valid | 
|   | 
Prevotellaceae Krieg, 2012 -- valid | 
|   | 
Procabacteriaceae Garrity et al., 2003 -- valid | 
|   | 
Promicromonosporaceae Rainey et al., 1997 -- valid | 
|   | 
Propionibacteriaceae Delwiche, 1957 -- valid | 
|   | 
Propionibacterineae Rainey et al., 1997 -- valid | 
|   | 
Pseudoalteromonadaceae Ivanova et al., 2004 -- valid | 
|   | 
Pseudomonadaceae Winslow et al., 1917 -- valid | 
|   | 
Pseudonocardiaceae Embley et al., 1989 -- valid | 
|   | 
Pseudonocardineae Stackebrandt et al., 1997 -- valid | 
|   | 
Psychromonadaceae Ivanova et al., 2004 -- valid | 
|   | 
Puniceicoccaceae Choo et al., 2007 -- valid | 
|   | 
Rarobacteraceae Stackebrandt and Schumann, 2000 -- valid | 
|   | 
Rhizobiaceae Conn, 1938 -- valid | 
|   | 
Rhodobacteraceae Garrity et al., 2006 -- valid | 
|   | 
Rhodobiaceae Garrity et al., 2006 -- valid | 
|   | 
Rhodocyclaceae Garrity et al., 2006 -- valid | 
|   | 
Rhodospirillaceae Pfennig and Trüper, 1971 -- valid | 
|   | 
Rhodothermaceae Ludwig et al., 2012 -- valid | 
|   | 
Rickettsiaceae Fryer and Lannan, 2005 -- valid | 
|   | 
Rikenellaceae Krieg et al., 2012 -- valid | 
|   | 
Ruaniaceae Tang et al., 2010 -- valid | 
|   | 
Rubritaleaceae Hedlund, 2012 -- valid | 
|   | 
Rubrobacteraceae Rainey et al., 1997 -- valid | 
|   | 
Rubrobacterineae Garrity and Holt, 2001 -- valid | 
|   | 
Ruminococcaceae -- valid | 
|   | 
Saccharospirillaceae Garrity et al., 2003 -- valid | 
|   | 
Salinisphaeraceae Naushad et al., 2015 -- valid | 
|   | 
Sandaracinaceae Mohr et al., 2012 -- valid | 
|   | 
Sanguibacteraceae Stackebrandt and Schumann, 2000 -- valid | 
|   | 
Saprospiraceae Krieg et al., 2012 -- valid | 
|   | 
Schleiferiaceae Albuquerque et al., 2011 -- valid | 
|   | 
Segniliparaceae Butler et al., 2005 -- valid | 
|   | 
Shewanellaceae Ivanova et al., 2004 -- valid | 
|   | 
Simkaniaceae Everett et al., 1999 -- valid | 
|   | 
Sinobacteraceae Zhou et al., 2008 -- valid | 
|   | 
Sneathiellaceae -- valid | 
|   | 
Solirubrobacteraceae Stackebrandt, 2005 -- valid | 
|   | 
Sorangiineae corrig. Reichenbach, 2007 -- valid | 
|   | 
Sphaerobacteraceae Stackebrandt et al., 1997 -- valid | 
|   | 
Sphaerobacterineae Garrity et al., 2003 -- valid | 
|   | 
Sphingobacteriaceae Steyn et al., 1998 -- valid | 
|   | 
Sphingomonadaceae -- valid | 
|   | 
Spirillaceae Migula, 1894 -- valid | 
|   | 
Spirochaetaceae Swellengrebel, 1907 -- valid | 
|   | 
Spiroplasmataceae -- valid | 
|   | 
Sporichthyaceae Rainey et al., 1997 -- valid | 
|   | 
Sporolactobacillaceae Ludwig et al., 2010 -- valid | 
|   | 
Staphylococcaceae Schleifer and Bell, 2010 -- valid | 
|   | 
Streptococcaceae Deibel and Seeley, 1974 -- valid | 
|   | 
Streptomycetaceae Waksman and Henrici, 1943 -- valid | 
|   | 
Streptomycineae Rainey et al., 1997 -- valid | 
|   | 
Streptosporangiaceae Goodfellow et al., 1990 -- valid | 
|   | 
Streptosporangineae Ward-Rainey et al., 1997 -- valid | 
|   | 
Succinivibrionaceae Hippe et al., 1999 -- valid | 
|   | 
Sutterellaceae Morotomi et al., 2011 -- valid | 
|   | 
Synergistaceae Jumas-Bilak et al., 2009 -- valid | 
|   | 
Syntrophaceae Kuever et al., 2006 -- valid | 
|   | 
Syntrophobacteraceae Kuever et al., 2006 -- valid | 
|   | 
Syntrophomonadaceae -- valid | 
|   | 
Syntrophorhabdaceae Qiu et al., 2008 -- valid | 
|   | 
Thermaceae Da Costa and Rainey, 2002 -- valid | 
|   | 
Thermithiobacillaceae Garrity et al., 2005 -- valid | 
|   | 
Thermoactinomycetaceae Matsuo et al., 2006 -- valid | 
|   | 
Thermoanaerobacteraceae Wiegel, 2010 -- valid | 
|   | 
Thermodesulfobacteriaceae Hatchikian et al., 2002 -- valid | 
|   | 
Thermodesulfobiaceae -- valid | 
|   | 
Thermogemmatisporaceae -- valid | 
|   | 
Thermoleophilaceae Stackebrandt, 2005 -- valid | 
|   | 
Thermolithobacteraceae Sokolova et al., 2007 -- valid | 
|   | 
Thermomicrobiaceae Garrity and Holt, 2002 -- valid | 
|   | 
Thermomonosporaceae Rainey et al., 1997 -- valid | 
|   | 
Thermosporotrichaceae -- valid | 
|   | 
Thermotogaceae Reysenbach, 2002 -- valid | 
|   | 
Thioalkalispiraceae Mori et al., 2011 -- valid | 
|   | 
Thiotrichaceae Garrity et al., 2005 -- valid | 
|   | 
Trueperaceae Rainey et al., 2005 -- valid | 
|   | 
Tsukamurellaceae Rainey et al., 1997 -- valid | 
|   | 
Veillonellaceae Rogosa, 1971 -- valid | 
|   | 
Verrucomicrobiaceae Ward-Rainey et al., 1996 -- valid | 
|   | 
Vibrionaceae Véron, 1965 -- valid | 
|   | 
Victivallaceae Derrien et al., 2012 -- valid | 
|   | 
Waddliaceae Rurangirwa et al., 1999 -- valid | 
|   | 
Xanthobacteraceae Lee et al., 2005 -- valid | 
|   | 
Xanthomonadaceae Saddler and Bradbury, 2005 -- valid | 
|   | 
Yaniellaceae Li et al., 2008 -- valid | 
|   | 
|  Kingdom Archaea | 
|   | 
Acidilobaceae -- valid | 
|   | 
Archaeoglobaceae -- valid | 
|   | 
Caldisphaeraceae -- valid | 
|   | 
Cenarchaeaceae -- valid | 
|   | 
Desulfurococcaceae -- valid | 
|   | 
Ferroplasmaceae -- valid | 
|   | 
Fervidicoccaceae -- valid | 
|   | 
Halobacteriaceae -- valid | 
|   | 
Methanobacteriaceae -- valid | 
|   | 
Methanocaldococcaceae -- valid | 
|   | 
Methanocellaceae -- valid | 
|   | 
Methanococcaceae -- valid | 
|   | 
Methanocorpusculaceae -- valid | 
|   | 
Methanomicrobiaceae -- valid | 
|   | 
Methanopyraceae -- valid | 
|   | 
Methanoregulaceae -- valid | 
|   | 
Methanosaetaceae -- invalid | 
|   | 
Methanosarcinaceae -- valid | 
|   | 
Methanospirillaceae -- valid | 
|   | 
Methanothermaceae -- valid | 
|   | 
Methermicoccaceae -- valid | 
|   | 
Picrophilaceae -- valid | 
|   | 
Pyrodictiaceae -- valid | 
|   | 
Sulfolobaceae -- valid | 
|   | 
Thermococcaceae -- valid | 
|   | 
Thermofilaceae -- valid | 
|   | 
Thermoplasmataceae -- valid | 
|   | 
Thermoproteaceae -- valid | 
          
            |   | 
              |