The Aquificaceae family

Family

In human context, a family is a group of people affiliated by consanguinity, affinity, or co-residence. In most societies it is the principal institution for the socialization of children...

 are bacteria that live in harsh environmental settings such as hot springs

Hot Springs

Hot Springs may refer to:* Hot Springs, Arkansas** Hot Springs National Park, Arkansas*Hot Springs, California**Hot Springs, Lassen County, California**Hot Springs, Modoc County, California**Hot Springs, Placer County, California...

, sulfur pools, and hydrothermal vent

Hydrothermal vent

A hydrothermal vent is a fissure in a planet's surface from which geothermally heated water issues. Hydrothermal vents are commonly found near volcanically active places, areas where tectonic plates are moving apart, ocean basins, and hotspots. Hydrothermal vents exist because the earth is both...

s. Although they are true bacteria

Bacteria

Bacteria are a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria have a wide range of shapes, ranging from spheres to rods and spirals...

 as opposed to the other inhabitants of extreme environments, the Archaea

Archaea

The Archaea are a group of single-celled microorganisms. A single individual or species from this domain is called an archaeon...

, Aquificaceae genera are an early phylogenetic

Phylogenetic tree

A phylogenetic tree or evolutionary tree is a branching diagram or "tree" showing the inferred evolutionary relationships among various biological species or other entities based upon similarities and differences in their physical and/or genetic characteristics...

 branch.

Classification

Family Aquificaceae

• Aquifex
  Aquifex
  Aquifex is a genus of bacteria, one of the few in the phylum Aquificae. The two species generally classified in Aquifex are A. pyrophilus and A. aeolicus. Both are highly thermophilic, growing best in water temperature of 85 °C to 95 °C...
  
  Huber and Stetter 1992
  • A. aeolicus♠ Huber and Stetter 2001
  • A. pyrophilus Huber and Stetter 1992
• Hydrogenivirga Nakagawa et al. 2004
  • H. caldilitoris Nakagawa et al. 2004
  • H. okinawensis Nunoura et al. 2008
• Hydrogenobacter Kawasumi et al. 1984
  • H. hydrogenophilus (Kryukov et al. 1984) Stöhr et al. 2001
  • H. subterraneus Takai et al. 2001
  • H. thermophilus Kawasumi et al. 1984
• Hydrogenobaculum Stöhr et al. 2001
  • Hydrogenobaculum acidophilum (Shima and Suzuki 1993) Stöhr et al. 2001
• Thermocrinis Huber et al. 1999
  • T. albus Eder and Huber 2002
  • T. minervae Caldwell et al. 2010
  • T. ruber Huber et al. 1999

Notes:

♠ Strain found at the National Center for Biotechnology Information

National Center for Biotechnology Information

The National Center for Biotechnology Information is part of the United States National Library of Medicine , a branch of the National Institutes of Health. The NCBI is located in Bethesda, Maryland and was founded in 1988 through legislation sponsored by Senator Claude Pepper...

 (NCBI) but has no standing with the Bacteriological Code (1990 and subsequent Revision) as detailed by List of Prokaryotic names with Standing in Nomenclature (LPSN) as a result of the following reasons:

• No pure culture isolated or available for Prokayotes.

• Not validly published because the effective publication only documents deposit of the type strain in a single recognized culture collection.

• Not approved and published by the International Journal of Systematic Bacteriology  or the International Journal of Systematic and Evolutionary Microbiology

International Journal of Systematic and Evolutionary Microbiology

The International Journal of Systematic and Evolutionary Microbiology is a peer-reviewed scientific journal in the field of microbial systematics, first published in 1951...

(IJSB/IJSEM).