Mesohippus
E901979
Mesohippus is an extinct three-toed early horse that lived during the Oligocene epoch and represents a key transitional form in equid evolution.
All labels observed (4)
| Label | Occurrences |
|---|---|
| Mesohippus bairdi | 2 |
| Mesohippus canonical | 1 |
| Mesohippus hypostylus | 1 |
| Mesohippus westoni | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T11009931 — 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: Mesohippus Context triple: [Equidae, containsExtinctGenera, Mesohippus]
-
A.
Hyracotherium
Hyracotherium is an extinct early horse-like mammal from the Eocene epoch, notable for being one of the earliest known members of the horse family.
-
B.
Xiphodon
Xiphodon is an extinct genus of small, deer-like artiodactyl mammals known from Eocene deposits in Europe.
-
C.
Erignathus
Erignathus is a genus of large Arctic seals in the family Phocidae, best known for the bearded seal (Erignathus barbatus).
-
D.
Mylodon darwini
Mylodon darwini is an extinct species of giant ground sloth that lived in South America during the Pleistocene and is known from well-preserved remains found in Patagonian caves.
-
E.
Arctodus
Arctodus is an extinct genus of large North American short-faced bears that lived during the Pleistocene epoch.
- 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: Mesohippus Target entity description: Mesohippus is an extinct three-toed early horse that lived during the Oligocene epoch and represents a key transitional form in equid evolution.
-
A.
Hyracotherium
Hyracotherium is an extinct early horse-like mammal from the Eocene epoch, notable for being one of the earliest known members of the horse family.
-
B.
Xiphodon
Xiphodon is an extinct genus of small, deer-like artiodactyl mammals known from Eocene deposits in Europe.
-
C.
Erignathus
Erignathus is a genus of large Arctic seals in the family Phocidae, best known for the bearded seal (Erignathus barbatus).
-
D.
Mylodon darwini
Mylodon darwini is an extinct species of giant ground sloth that lived in South America during the Pleistocene and is known from well-preserved remains found in Patagonian caves.
-
E.
Arctodus
Arctodus is an extinct genus of large North American short-faced bears that lived during the Pleistocene epoch.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
early horse
ⓘ
equid relative ⓘ extinct genus ⓘ perissodactyl ⓘ prehistoric mammal ⓘ |
| approximateHeightAtShoulder | about 60 centimeters ⓘ |
| bodySizeComparedToModernHorse | smaller ⓘ |
| brainSizeComparedToEarlierHorses | larger ⓘ |
| class | Mammalia ⓘ |
| diet | herbivorous ⓘ |
| evolutionaryPosition |
more advanced than Hyracotherium
ⓘ
more primitive than Miohippus ⓘ |
| evolutionarySignificance | key transitional form in horse evolution ⓘ |
| family | Equidae ⓘ |
| feedingType | browser ⓘ |
| firstAppearance | late Eocene ⓘ |
| fossilRecordRegion |
Great Plains
ⓘ
Western United States ⓘ
linked to:
western United States
|
| foundIn | North America ⓘ |
| geologicalTimeRange | approximately 37 to 30 million years ago ⓘ |
| habitat |
forested environments
ⓘ
woodlands ⓘ |
| hasSpecies |
Mesohippus bairdi
ⓘ
linked to:
Mesohippus
Mesohippus hypostylus ⓘ
linked to:
Mesohippus
Mesohippus westoni ⓘ
linked to:
Mesohippus
|
| isExtinct | true ⓘ |
| kingdom | Animalia ⓘ |
| lastAppearance | late Oligocene ⓘ |
| limbAdaptation | adapted for faster running than earlier horses ⓘ |
| livedDuring |
Oligocene epoch
ⓘ
linked to:
Oligocene Epoch
|
| locomotion | cursorial ⓘ |
| mainWeightBearingToe | middle toe ⓘ |
| namedBy | Othniel Charles Marsh ⓘ |
| notableFossilSite |
Nebraska
ⓘ
South Dakota ⓘ |
| order | Perissodactyla ⓘ |
| phylum | Chordata ⓘ |
| relatedTo |
Hyracotherium
ⓘ
Miohippus ⓘ |
| roleInPaleontology | important for understanding equid limb evolution ⓘ |
| skullCharacteristic | more elongated skull ⓘ |
| snoutLengthComparedToEarlierHorses | longer ⓘ |
| subfamily | Anchitheriinae ⓘ |
| taxonRank | genus ⓘ |
| toeCountForelimb | three ⓘ |
| toeCountHindlimb | three ⓘ |
| toothAdaptation | adapted for browsing soft vegetation ⓘ |
| toothType | low-crowned teeth ⓘ |
| typeSpecies |
Mesohippus bairdi
ⓘ
linked to:
Mesohippus
|
| yearDescribed | 1875 ⓘ |
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: Mesohippus Description of subject: Mesohippus is an extinct three-toed early horse that lived during the Oligocene epoch and represents a key transitional form in equid evolution.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Mesohippus
linked to: Mesohippus
linked to: Mesohippus
linked to: Mesohippus