Osteostraci
E414615
Osteostraci is an extinct group of armored, jawless vertebrates known from the Silurian and Devonian periods, notable for their bony head shields and importance in early vertebrate evolution.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Osteostraci canonical | 2 |
| Pteraspidomorphi | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T4138798 — 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: Osteostraci Context triple: [Agnatha, includesExtinctGroup, Osteostraci]
-
A.
Acanthodii
Acanthodii are an extinct class of early jawed fishes, often called "spiny sharks," that played a key role in the evolution of vertebrate jaws and fins.
-
B.
Champsosaurus
Champsosaurus was a long-snouted, semi-aquatic reptile from the Late Cretaceous and early Paleogene that resembled a modern gharial and belonged to the extinct group Choristodera.
-
C.
Placodermi
Placodermi is an extinct class of armored prehistoric fishes that were among the earliest jawed vertebrates.
-
D.
Erpetoichthys
Erpetoichthys is a genus of elongated, eel-like bichir fishes native to African freshwater habitats, best known for the ropefish (Erpetoichthys calabaricus).
-
E.
Sarcopterygii
Sarcopterygii is the class of lobe-finned fishes that includes the evolutionary ancestors of all tetrapods (amphibians, reptiles, birds, and mammals).
- 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: Osteostraci Target entity description: Osteostraci is an extinct group of armored, jawless vertebrates known from the Silurian and Devonian periods, notable for their bony head shields and importance in early vertebrate evolution.
-
A.
Acanthodii
Acanthodii are an extinct class of early jawed fishes, often called "spiny sharks," that played a key role in the evolution of vertebrate jaws and fins.
-
B.
Champsosaurus
Champsosaurus was a long-snouted, semi-aquatic reptile from the Late Cretaceous and early Paleogene that resembled a modern gharial and belonged to the extinct group Choristodera.
-
C.
Placodermi
Placodermi is an extinct class of armored prehistoric fishes that were among the earliest jawed vertebrates.
-
D.
Erpetoichthys
Erpetoichthys is a genus of elongated, eel-like bichir fishes native to African freshwater habitats, best known for the ropefish (Erpetoichthys calabaricus).
-
E.
Sarcopterygii
Sarcopterygii is the class of lobe-finned fishes that includes the evolutionary ancestors of all tetrapods (amphibians, reptiles, birds, and mammals).
- F. None of above. chosen
Statements (53)
| Predicate | Object |
|---|---|
| instanceOf |
extinct jawless vertebrate clade
ⓘ
ostracoderm ⓘ stem-gnathostome ⓘ |
| bodyPlan |
streamlined trunk with reduced scales
ⓘ
tadpole-like body with large head region ⓘ |
| clade |
Ostracodermi
ⓘ
surface form:
Pteraspidomorphi
|
| containsTaxon |
Ateleaspis
ⓘ
Cephalaspis ⓘ Hemicyclaspis ⓘ Tremataspis ⓘ |
| ecologicalRole | benthic vertebrate ⓘ |
| feedingMode |
deposit feeder
ⓘ
suction feeder ⓘ |
| firstAppearance | Early Silurian ⓘ |
| fossilRecordRegion |
China
ⓘ
Europe ⓘ North America ⓘ Russia ⓘ |
| geologicalStatus | extinct ⓘ |
| hasCharacteristic |
armored
ⓘ
bony head shield ⓘ cartilaginous internal skeleton ⓘ dorsal and lateral fields of sensory canals on head shield ⓘ dorsoventrally flattened head ⓘ heterocercal tail ⓘ hypocercal tail lobe in some taxa ⓘ jawless ⓘ mineralized dermal armor ⓘ paired pectoral fins or fin-like structures ⓘ single median nostril ⓘ well-developed sensory line system ⓘ |
| higherClassification |
Ostracodermi
ⓘ
surface form:
Pteraspidomorphi
|
| kingdom | Animalia ⓘ |
| lastAppearance | Late Devonian ⓘ |
| likelyHabitat |
estuarine environments
ⓘ
freshwater environments ⓘ marine environments ⓘ |
| notableFor |
advanced paired fin morphology among jawless vertebrates
ⓘ
evidence on origin of jawed vertebrates ⓘ importance in early vertebrate evolution ⓘ well-preserved neurocranial anatomy ⓘ |
| phylum | Chordata ⓘ |
| relatedTo |
Anaspida
ⓘ
Ostracodermi ⓘ
surface form:
Galeaspida
Ostracodermi ⓘ
surface form:
Heterostraci
early gnathostomes ⓘ |
| researchField |
evolutionary biology
ⓘ
vertebrate paleontology ⓘ |
| subphylum | Vertebrata ⓘ |
| taxonomicRank | class ⓘ |
| temporalRangeEnd | Devonian ⓘ |
| temporalRangeStart | Silurian NERFINISHED ⓘ |
| typeLocalityExample | Ludlow and Pridoli strata of the Silurian of Europe ⓘ |
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: Osteostraci Description of subject: Osteostraci is an extinct group of armored, jawless vertebrates known from the Silurian and Devonian periods, notable for their bony head shields and importance in early vertebrate evolution.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Pteraspidomorphi