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Haloarcula
SEM image of Haloarcula quadrata.
Scientific classification
Domain:	Archaea
Kingdom:	Euryarchaeota
Phylum:	Euryarchaeota
Class:	Halobacteria
Order:	Halobacteriales
Family:	Haloarculaceae
Genus:	Haloarcula Torreblanca et al. 1986 emend. Ma et al. 2024
Type species
Haloarcula vallismortis (Gonzalez, Gutierrez & Ramirez 1979) Torreblanca et al. 1986
Species
See text

Haloarcula (common abbreviation Har.) is a genus of extreme halophilic Archaea in the class of Halobactaria.

Cell Structure

Haloarcula species can be distinguished from other genera in the family Halobacteriaceae by the presence of specific derivatives of TGD-2 polar lipids. H. quadrata has predominantly flat, square-shaped, somewhat pleomorphic cells.

Metabolism

H. quadrata was first isolated when researchers were attempting to culture Haloquadratum walsbyi, a haloarchaeon that was thought to be unculturable until 2004. Similar to other halophilic archaea, Haloarcula species grow optimally at 40–45 °C. Growth appears in sheets of up to 65 cells often in the shape of a square or triangle.

Taxonomy

The genus of Haloarcula was long grouped with other halophilic archaea such as Halobacterium until genomic analysis prompted to reorder this genus in the new family of Haloarculaceae.

Phylogeny

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and National Center for Biotechnology Information (NCBI).

Unassigned Haloarcula

• "H. ajinwuensis"
• "H. algeriensis" Kharroub et al. 2005b
• "H. altuensis"
• "H. brevis" Ma et al. 2024
• H. halobia Ma et al. 2024
• H. halophila Ma et al. 2024
• H. litorea Ma et al. 2024
• "H. morrhuae" Torreblanca et al. 1986
• H. ordinaria Ma et al. 2024
• H. pelagica Ma et al. 2024
• H. rara Ma et al. 2024
• "H. regularis" Ma et al. 2024
• "H. sediminis" Ma et al. 2024
• "H. siamensis" Namwong et al. 2007

Ecology

Haloarcula species are found in neutral saline environments such as salt lakes, marine salterns, and saline soils. Like other members of the family Halobacteriaceae, Haloarcula requires at least 1.5 M NaCl for growth, but grow optimally in 2.0 to 4.5 M NaCl.

See also

• List of Archaea genera

References

1. ^ Sayers; et al. "Haloarcula". National Center for Biotechnology Information (NCBI) taxonomy database. Retrieved 2023-10-10.
2. Oren, Aharon (2014), Rosenberg, Eugene; DeLong, Edward F.; Lory, Stephen; Stackebrandt, Erko (eds.), "The Family Halobacteriaceae", The Prokaryotes: Other Major Lineages of Bacteria and The Archaea, Berlin, Heidelberg: Springer, pp. 41–121, Bibcode:2014prok.book...41O, doi:10.1007/978-3-642-38954-2_313, ISBN 978-3-642-38954-2, retrieved 2021-11-17
3. Oren, A.; Ventosa, A.; Gutierrez, M. C.; Kamekura, M. (1999). "Haloarcula quadrata sp. nov., a square, motile archaeon isolated from a brine pool in Sinai (Egypt)". International Journal of Systematic Bacteriology. 49 (3): 1149–1155. doi:10.1099/00207713-49-3-1149. PMID 10425773.
4. J.P. Euzéby. "Haloarcula". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved 2023-10-10.
5. "The LTP". Retrieved 10 December 2024.
6. "LTP_all tree in newick format". Retrieved 10 December 2024.
7. "LTP_10_2024 Release Notes" (PDF). Retrieved 10 December 2024.
8. "GTDB release 09-RS220". Genome Taxonomy Database. Retrieved 10 May 2024.
9. "ar53_r220.sp_label". Genome Taxonomy Database. Retrieved 10 May 2024.
10. "Taxon History". Genome Taxonomy Database. Retrieved 10 May 2024.

Further reading

• Torreblanca M, Rodriquez-Valera F, Juez G, Ventosa A, Kamekura M, Kates M (1986). "Classification of non-alkaliphilic halobacteria based on numerical taxonomy and polar lipid composition, and description of Haloarcula gen. nov. and Haloferax gen.nov". Syst. Appl. Microbiol. 8 (1–2): 89–99. doi:10.1016/s0723-2020(86)80155-2.
• Oren A, Ventosa A (2000). "International Committee on Systematic Bacteriology Subcommittee on the taxonomy of Halobacteriaceae. Minutes of the meetings, 16 August 1999, Sydney, Australia". Int. J. Syst. Evol. Microbiol. 50 (3): 1405–1407. doi:10.1099/00207713-50-3-1405. PMID 10843089.
• Javor B, Requadt C, Stoeckenius W (1982). "Box-shaped halophilic bacteria". J. Bacteriol. 151 (3): 1532–1542. doi:10.1128/jb.151.3.1532-1542.1982. PMC 220435. PMID 6286602.

External links

• Haloarcula at BacDive - the Bacterial Diversity Metadatabase

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