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Rickettsias
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Alpha Proteobacteria
Order: Rickettsiales
Gieszczkiewicz, 1939
Families

Rickettsiaceae
Anaplasmataceae [1] Holosporaceae

The Rickettsiales, also called rickettsias, are an order of small proteobacteria. Most of those described survive only as endosymbionts of other cells. Some are notable pathogens, including Rickettsia, which causes a variety of diseases in humans. On the other end of the scale, genetic studies support the endosymbiotic theory according to which mitochondria and related organelles developed from members of this group. Some have also speculated that viruses might have developed from them, or from organisms like them.

The Rickettsiales are among the most mysterious groups of Proteobacteria, owing largely to difficulties in cultivating them. Originally the group included all obligate endosymbiont bacteria. However, a number of species have been removed, such as Coxiella burnetii, the cause of Q fever. Environmental samples have found a variety of genes that originate from this group, pointing to a number of free-living planktonic species. These include SAR11, later cultivated as Pelagibacter ubique, one of the most common bacteria in the world. As of 2005, the exact composition and classification is far from settled.

References

  1. ^ Garrity, George (2005). Bergey's Manual of Systematic Bacteriology. Springer. ISBN 0-387-24145-0.  

Wiktionary

Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

Contents

Translingual

Etymology

Proper noun

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Rickettsiales

  1. a taxonomic order, within class Alpha Proteobacteria - the rickettsia bacteria etc
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See also


Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Taxonavigation

Main Page
Superregnum: Bacteria
Regnum: Bacteria
Phylum: Proteobacteria
Classis: Alpha Proteobacteria
Ordo: Rickettsiales
Familiae: Anaplasmataceae - Holosporaceae - Rickettsiaceae - SAR11 cluster -

Name

Rickettsiales Gieszczykiewicz, 1939

Type familia: Rickettsiaceae Pinkerton, 1936

References

  • M. Gieszczykiewicz: Zagadniene systematihki w bakteriologii - Zür Frage der Bakterien-Systematic. Bulletin de l'Académie Polonaise des Sciences Série des Sciences Biologiques 1: 9-27 (1939)
  • List of Prokaryotic Names [1]

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