science

Nanohalarchaeota

Nanohalarchaeota is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nanohalarchaeota rather than just read about it. In short: Nanohalarchaeota is a phylum of diminutive archaea with small genomes and limited metabolic capabilities, belonging to kingdom Nanobdellati. They are ubiquitous in hypersaline habitats, which they share with the extremely halophilic haloarchaea.

Key takeaways

Nanohalarchaeota belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Nanohalarchaeota to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Nanohalarchaeota from memory before moving on to harder problems.

Reference excerpt

Nanohalarchaeota is a phylum of diminutive archaea with small genomes and limited metabolic capabilities, belonging to kingdom Nanobdellati. They are ubiquitous in hypersaline habitats, which they share with the extremely halophilic haloarchaea. Nanohaloarchaea were first identified from metagenomic data as a class of uncultivated halophilic archaea composed of six clades and were subsequently placed in the phylum Nanohalarchaeota within the DPANN clade (kingdom Nanobdellati). However, the phylogenetic position of nanohaloarchaea is still highly debated, being alternatively proposed as the sister-lineage of haloarchaea or a member of the Nanobdellati kingdom. The lineage has since been identified in data from a range of hypersaline environments including: Australian thalassohaline lake, Spanish saltern, Russian soda brine, Californian saltern, Chilean halite, and Ethiopian Dallol hydrothermal system. Like most other members of DPANN, they are only known to live with a host (specifically a similarly halophilic archaeon) in symbiosis. The exact nature of this interaction with the host vary among species, from mutualism to parasitic predation.

Viruses Several species of nanhoaloarchaea encode CRISPR-Cas systems suggesting that they are parasitized by viruses. Consistently, metagenomic analysis has revealed that nanohaloarchaea are associated with diverse viruses. These viruses belong to four morphologically different groups, including those with head-tailed (class Caudoviricetes), tailless icoahedral (realm Singelaviria), enveloped pleomorphic and spindle-shaped virions. Currently known nanohaloarchaeal viruses have been classified into seven distinct families.

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

Phylum "Nanohalarchaeota" corrig. Rinke et al. 2013

Class "Nanohalarchaeia" corrig. Narasingarao et al. 2012 Order "Nanohalarchaeales" Family "Nanohalarchaeaceae" Genus ?"Candidatus Nanohalarchaeum" corrig. Hamm et al. 2019 "Ca. N. antarcticum" corrig. Hamm et al. 2019 Genus ?"Candidatus Nanopetraeus" corrig. Crits‐Christoph et al. 2016 ["Nanopetramus" (sic)] "Ca. N. primus" corrig. Crits‐Christoph et al. 2016 Order "Nanohydrothermales" Xie et al. 2022 Family "Nanohydrothermaceae" Xie et al. 2022 Genus ?"Candidatus Nanohydrothermus" Xie et al. 2022 "Ca. N. guaymasensis" Xie et al. 2022 Order "Nucleotidisoterales" Xie et al. 2022 Family "Nanosalenecaceae" Xie et al. 2022 Genus ?"Candidatus Nanosalenecus" Xie et al. 2022 "Ca. N. halilacustris" Xie et al. 2022 Family "Nucleotidisoteraceae" Xie et al. 2022 Genus ?"Candidatus Nucleotidisoter" Xie et al. 2022 "Ca. N. xinjiangensis" Xie et al. 2022 Family "Nucleotidivindicaceae" Xie et al. 2022 Genus ?"Candidatus Nucleotidivindex" Xie et al. 2022 "Ca. N. qijiaojingensis" Xie et al. 2022 Class "Nanohalobiia" corrig. La Cono et al. 2020 ["Nanosalinia" Rinke et al. 2021] Order "Nanohalobiales" La Cono et al. 2020 ["Nanosalinales" Rinke et al. 2020] Family "Nanoanaerosalinaceae" Zhao et al. 2022 Genus "Candidatus Asbonarchaeum" Baker et al. 2024 "Ca. A. danakilense" Baker et al. 2024 Genus "Candidatus Nanoanaerosalina" Zhao et al. 2022 "Ca. N. halalkaliphila" Zhao et al. 2022 Family "Nanohalalkaliarchaeaceae" Zhao et al. 2022 Genus "Candidatus Nanohalalkaliarchaeum" Zhao et al. 2022 "Ca. N. halalkaliphilum" Zhao et al. 2022 Family "Nanohalobiaceae" La Cono et al. 2020 ["Nanosalinaceae" Rinke et al. 2020] Genus ?"Candidatus Haloredivivus" Ghai et al. 2011 "Ca. N. primus" corrig. Ghai et al. 2011 Genus "Candidatus Nanohalobium" La Cono et al. 2020 "Ca. N. constans" La Cono et al. 2020 Genus "Candidatus Nanohalococcus" Reva et al. 2023 "Ca. N. occultus" Reva et al. 2023 Genus "Candidatus Nanohalovita" Reva et al. 2023 "Ca. N. haloferacivicina" Reva et al. 2023 Genus "Candidatus Nanosalina" Narasingarao et al. 2012 "Ca. N. primus" corrig. Narasingarao et al. 2012 Genus "Candidatus Nanosalinicola" corrig. Narasingarao et al. 2012 ["Nanosalinarum" (sic)] "Ca. N. primus" corrig. Narasingarao et al. 2012

Worked examples

Example 1 — a first encounter with Nanohalarchaeota

Start with the simplest possible case. Write down what Nanohalarchaeota claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nanohalarchaeota before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nanohalarchaeota ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nanohalarchaeota

In research: Nanohalarchaeota appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nanohalarchaeota in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nanohalarchaeota is common in secondary-school and first-year university syllabi. It links to neighbouring topics Archaea classes, Candidatus taxa, Methanobacteriati, so understanding it makes those chapters shorter.
In everyday life: Look for Nanohalarchaeota outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nanohalarchaeota in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nanohalarchaeota means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Nanohalarchaeota out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nanohalarchaeota in simple terms?

Why does Nanohalarchaeota matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nanohalarchaeota?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nanohalarchaeota.