In taxonomy, the Thermoplasmatales are an order of the Thermoplasmata.[1] All are acidophiles, growing optimally at pH below 2. Picrophilus is currently the most acidophilic of all known organisms, being capable of growing at a pH of -0.06.[2] Many of these organisms do not contain a cell wall, although this is not true in the case of Picrophilus. Most members of the Thermotoplasmata are thermophilic.

Scientific classification
Thermoplasmata Reysenbach 2002
Thermoplasmatales Reysenbach 2002


The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN)[3] and National Center for Biotechnology Information (NCBI)[4] and the phylogeny is based on 16S rRNA-based LTP release 106 by 'The All-Species Living Tree' Project.[5]

Thermogymnomonas acidicola Itoh et al. 2007


T. acidophilum Darland et al. 1970 (type sp.)

T. volcanium Segerer et al. 1988


P. oshimae Schleper et al. 1996 (type sp.)

P. torridus Zillig et al. 1996


A. aeolicum Golyshina et al. 2009 (type sp.)

A. cupricumulans (Hawkes et al. 2008) Golyshina et al. 2009


?F. acidarmanusDopson et al. 2004

?F. thermophilumZhou et al. 2008

F. acidiphilum Golyshina et al. 2000 (type sp.)

♠ Strains found at the National Center for Biotechnology Information (NCBI) but not listed in the List of Prokaryotic names with Standing in Nomenclature LPSN


  • Madigan, M.T. & Martinko, J.M. (2005). Brock Biology of Microorganisms (11th ed.). Pearson Prentice Hall.

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