Alicyclobacillaceae the bacteria are a family of Gram-positive bacteria. It is mostly aerobic (oxygen -requiring ), immovable, rod-shaped bacteria. The formation of spores occurs. The species are usually acidophilic (acid loving) and thermophilic ( heat- loving). Eg Kyrpidia tusciae shows optimum growth at 47 to 65 ° C, the kinds of Alicyclobacillus at temperatures between 35 and 65 ° C.

The bacteria were, among other commonly found in normal soil and in the water and soil from geothermal sources. Due to the acid resistance and heat resistance, the type Alicyclobacillus acidoterrestris occur as fruit juice spoiler.


Earlier also the genera Sulfobacillus and Pasteuria were counted to the family. On the basis of 16S rRNA analysis, it will now be made ​​to other families. Sulfobacillus now belongs to the order Clostridiales and Pasteuria was provided to a family, the Pasteuriaceae. Pasteuria is an obligate parasite of invertebrates, Sulfobacillus is thermophilic with temperatures of 40 to 55 ° C for optimal growth.

Genera of the family are (as of 2014):

  • Alicyclobacillus Wisotzkey et al. 1992 emend. Karavaiko et al. 2005 ( the type genus of the family)
  • Kyrpidia Klenk et al. 2012
  • Tumebacillus Steven et al. 2008