''Natrialbales'' is an order of

halophilic The halophiles, named after the Greek word for "salt-loving", are extremophiles that thrive in high salt concentrations. While most halophiles are classified into the domain Archaea, there are also bacterial halophiles and some eukaryotic species, ...

chemoorganotrophic Primary nutritional groups are groups of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction. The sources of energy can be light or chemical compounds; the ...

archaea within the class Haloarchaea. The type genus of this order is ''

Natrialba In taxonomy, ''Natrialba'' is a genus of the Natrialbaceae. The genus consists of many diverse species that can survive extreme environmental niches, especially they are capable to live in the waters saturated or nearly saturated with salt (halop ...

.'' The name ''Natrialbales'' is derived from the Latin term ''Natriabla,'' referring to the type genus of the order and the suffix "-ales", an ending used to denote an order. Together, ''Natrialbales'' refers to an order whose nomenclatural type is the genus ''Natrialba.''

Biochemical characteristics and molecular signatures

Members are

chemoorganotroph Primary nutritional groups are groups of organisms, divided in relation to the nutrition mode according to the sources of energy and carbon, needed for living, growth and reproduction. The sources of energy can be light or chemical compounds; the ...

s and are mainly isolated from high-salt environments such as saline lakes, soda lakes and salted hides. Some members are motile. Morphology is variable, including rod, coccus or pleomorphic shapes. Majority of the class are able to grow optimally in alkaline pH and do not possess gas vesicles. The DNA G+C content for this order ranges between 60-70 mol%. This order can be reliably distinguished from other orders within the phylum Euryarchaeota by the presence of eight conserved signature proteins (CSPs) and two conserved signature indels (CSIs) present in the ribosomal operon protein and small GTP-binding protein.

Historical systematics and taxonomy

As of 2021, ''Natrialbales'' contains one family, ''Natrialbaceae''. Members of this order was demarcated from the class Halobacteria, previously a large phylogenetically unrelated group of species with distinct biochemical characteristics and different ecological niches. 16S rRNA based phylogenetic trees and morphological/physiological characteristics were not sufficient to clarify the evolutionary relationship above the genus level within the class Halobacteria. In 2015, Gupta et al. proposed the division of the class Halobacteria into '' Halobacteriales, Haloferacales and Natrialbales'' based on comparative genomic analyses and the branching pattern of various phylogenetic trees constructed from several different datasets of conserved proteins and 16S rRNA sequences. Molecular markers, specifically conserved signature indels, specific to this order were also identified as evidence supporting the division independent of phylogenetic trees.

Phylogeny

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature (LPSN) and

National Center for Biotechnology Information The National Center for Biotechnology Information (NCBI) is part of the United States National Library of Medicine (NLM), a branch of the National Institutes of Health (NIH). It is approved and funded by the government of the United States. The ...

(NCBI). Note: * paraphyletic Halobacteriaceae

References

{{Taxonbar, from=Q25998044 Halobacteria Taxa described in 2015 Monotypic archaea taxa

Biochemical characteristics and molecular signatures

Historical systematics and taxonomy

Phylogeny

See also

References