Nanoarchaeum equitans
E256846
Nanoarchaeum equitans is a tiny symbiotic archaeon known for its extremely small genome and dependence on its host Ignicoccus for many essential metabolic functions.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Nanoarchaeum equitans canonical | 4 |
| Nanoarchaeum | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2331084 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Nanoarchaeum equitans Context triple: [Nanoarchaeota, notableSpecies, Nanoarchaeum equitans]
-
A.
Nanoarchaeota
Nanoarchaeota is a phylum of ultra-small, symbiotic archaea known for their reduced genomes and association with other archaeal hosts in extreme environments.
-
B.
Korarchaeota
Korarchaeota are a deeply branching, poorly understood lineage of Archaea typically found in high-temperature environments and known mainly from environmental DNA rather than cultivated representatives.
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C.
Ignicoccus hospitalis
Ignicoccus hospitalis is a hyperthermophilic archaeon that thrives in extremely hot, sulfur-rich environments and is notable for its unique cell envelope and symbiotic association with the nanoarchaeon Nanoarchaeum equitans.
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D.
Sulfolobus solfataricus
Sulfolobus solfataricus is a thermoacidophilic archaeon commonly found in volcanic hot springs, widely used as a model organism for studying extremophile biology and archaeal molecular processes.
-
E.
Nitrosopumilus
Nitrosopumilus is a genus of marine ammonia-oxidizing archaea that plays a key role in the global nitrogen cycle, particularly in oceanic environments.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Nanoarchaeum equitans Target entity description: Nanoarchaeum equitans is a tiny symbiotic archaeon known for its extremely small genome and dependence on its host Ignicoccus for many essential metabolic functions.
-
A.
Nanoarchaeota
Nanoarchaeota is a phylum of ultra-small, symbiotic archaea known for their reduced genomes and association with other archaeal hosts in extreme environments.
-
B.
Korarchaeota
Korarchaeota are a deeply branching, poorly understood lineage of Archaea typically found in high-temperature environments and known mainly from environmental DNA rather than cultivated representatives.
-
C.
Ignicoccus hospitalis
Ignicoccus hospitalis is a hyperthermophilic archaeon that thrives in extremely hot, sulfur-rich environments and is notable for its unique cell envelope and symbiotic association with the nanoarchaeon Nanoarchaeum equitans.
-
D.
Sulfolobus solfataricus
Sulfolobus solfataricus is a thermoacidophilic archaeon commonly found in volcanic hot springs, widely used as a model organism for studying extremophile biology and archaeal molecular processes.
-
E.
Nitrosopumilus
Nitrosopumilus is a genus of marine ammonia-oxidizing archaea that plays a key role in the global nitrogen cycle, particularly in oceanic environments.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
archaeon
ⓘ
microorganism ⓘ symbiont ⓘ |
| authority |
Huber
ⓘ
surface form:
Huber et al. 2002
|
| binomialName | Nanoarchaeum equitans self-link ⓘ |
| cellDiameter | about 400 nm ⓘ |
| cellEnvelope | S-layer ⓘ |
| cellShape | coccoid ⓘ |
| cellType | prokaryote ⓘ |
| cellularAssociationWithHost | attached to the surface of Ignicoccus cells ⓘ |
| class |
Nanoarchaeota
ⓘ
surface form:
Nanoarchaeia
|
| discoveredBy |
Harald Huber
ⓘ
Karl O. Stetter ⓘ |
| discoveryCountry | Iceland ⓘ |
| discoveryLocation | Kolbeinsey Ridge hydrothermal vent field ⓘ |
| discoveryYear | 2002 ⓘ |
| domain | Archaea ⓘ |
| energyMetabolism | lacks complete pathways for ATP synthesis ⓘ |
| family |
Nanoarchaeota
ⓘ
surface form:
Nanoarchaeaceae
|
| genomeFeature |
high coding density
ⓘ
reduced metabolic gene content ⓘ |
| genomeSize |
approximately 0.49 megabase pairs
ⓘ
approximately 490,000 base pairs ⓘ |
| genomeType | circular DNA ⓘ |
| genus |
Nanoarchaeum equitans
self-linksurface differs
ⓘ
surface form:
Nanoarchaeum
|
| habitat |
marine hydrothermal vents
ⓘ
submarine hot springs near Iceland ⓘ |
| host | Ignicoccus hospitalis ⓘ |
| hostDependency |
Ignicoccus
ⓘ
surface form:
depends on Ignicoccus for many essential metabolic functions
|
| kingdom | Archaea ⓘ |
| lifestyle |
obligate parasite
ⓘ
obligate symbiont ⓘ |
| metabolism |
cannot synthesize most amino acids
ⓘ
cannot synthesize most nucleotides ⓘ lacks genes for many core metabolic pathways ⓘ relies on host for lipids ⓘ |
| motility | non-motile ⓘ |
| notableFor |
extremely small genome
ⓘ
obligate symbiosis with Ignicoccus ⓘ one of the smallest known cellular organisms ⓘ |
| optimalGrowthTemperature | around 90 °C ⓘ |
| order |
Nanoarchaeota
ⓘ
surface form:
Nanoarchaeales
|
| oxygenRequirement | anaerobic ⓘ |
| phylogeneticSignificance | represents a deeply branching archaeal lineage ⓘ |
| phylum | Nanoarchaeota ⓘ |
| reproduction | binary fission ⓘ |
| researchUse | model organism for minimal cellular life ⓘ |
| ribosomalRNA | 16S rRNA gene used for phylogenetic placement ⓘ |
| taxonRank | species ⓘ |
| temperaturePreference | hyperthermophilic ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Nanoarchaeum equitans Description of subject: Nanoarchaeum equitans is a tiny symbiotic archaeon known for its extremely small genome and dependence on its host Ignicoccus for many essential metabolic functions.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Nanoarchaeum