The Family Picrophilaceae

  • Anna-Louise Reysenbach
  • Kristen Brileya
Reference work entry


The genus Picrophilus is the only described genus of the family Picrophilaceae and is represented by two species, P. torridus and P. oshimae. The only apparent differentiating feature between the two species is their 16S rRNA gene sequences which are 99.45 % similar over 1,460 nucleotides. Given this, it is unlikely that these are two separate species. Picrophilus are nonmotile, irregular cocci and are thermophilic, heterotrophic, obligate aerobes that are hyperacidophilic, growing optimally at 60 °C and pH 0.7. Picrophilaceae differs from Ferroplasmaceae and Thermoplasmaceae in that members of Picrophilaceae have an S-layer. The genome of P. torridus has been sequenced, revealing one of the smallest known genomes of an aerobic free-living heterotrophic archaeon at 1.55 Mb.


Reverse Gyrase Tetraether Lipid Obligate Aerobe Hypothetical ORFs Accession Number AE017261 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Department of BiologyPortland State UniversityPortlandUSA

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