Marrella
E782938
Marrella is an extinct, small, soft-bodied arthropod known from the Burgess Shale, notable for its distinctive spined head shield and importance in understanding early Cambrian marine ecosystems.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Marrella canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T9128559 — 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: Marrella Context triple: [Cambrian biota, includesTaxon, Marrella]
-
A.
Anomalocaris
Anomalocaris was a large, predatory marine arthropod-like creature from the Cambrian period, notable for its grasping frontal appendages and circular, toothed mouth.
-
B.
Wiwaxia
Wiwaxia is an extinct, soft-bodied marine organism from the Cambrian period, characterized by its scale- and spine-covered body and known from exceptionally preserved fossil deposits.
-
C.
Capnoides
Capnoides is a small genus of flowering plants in the poppy order Papaverales, known for delicate, often tubular flowers and typically found in temperate regions.
-
D.
Metischnogaster
Metischnogaster is a genus of small, primitively eusocial hover wasps within the subfamily Stenogastrinae, known for their distinctive nesting behavior in tropical Asia.
-
E.
Neopilina
Neopilina is a genus of deep-sea mollusks considered living fossils, providing key insights into the evolution and ancestral features of molluscan groups.
- 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: Marrella Target entity description: Marrella is an extinct, small, soft-bodied arthropod known from the Burgess Shale, notable for its distinctive spined head shield and importance in understanding early Cambrian marine ecosystems.
-
A.
Anomalocaris
Anomalocaris was a large, predatory marine arthropod-like creature from the Cambrian period, notable for its grasping frontal appendages and circular, toothed mouth.
-
B.
Wiwaxia
Wiwaxia is an extinct, soft-bodied marine organism from the Cambrian period, characterized by its scale- and spine-covered body and known from exceptionally preserved fossil deposits.
-
C.
Capnoides
Capnoides is a small genus of flowering plants in the poppy order Papaverales, known for delicate, often tubular flowers and typically found in temperate regions.
-
D.
Metischnogaster
Metischnogaster is a genus of small, primitively eusocial hover wasps within the subfamily Stenogastrinae, known for their distinctive nesting behavior in tropical Asia.
-
E.
Neopilina
Neopilina is a genus of deep-sea mollusks considered living fossils, providing key insights into the evolution and ancestral features of molluscan groups.
- F. None of above. chosen
Statements (46)
| Predicate | Object |
|---|---|
| instanceOf |
Burgess Shale fossil
ⓘ
fossil arthropod genus ⓘ |
| ageInMillionsOfYears | approximately 508 million years ago ⓘ |
| bodyPlan | soft-bodied arthropod with cephalic shield and spines ⓘ |
| bodySize | about 2 cm in length ⓘ |
| class | Marrellomorpha NERFINISHED ⓘ |
| describedBy | Charles Doolittle Walcott NERFINISHED ⓘ |
| discoveredAt | Walcott Quarry NERFINISHED ⓘ |
| ecologicalRole | component of early Cambrian marine ecosystems ⓘ |
| environment | outer shelf marine setting ⓘ |
| exhibits |
complex cephalic ornamentation
ⓘ
well-developed gill branches on appendages ⓘ |
| family | Marrellidae NERFINISHED ⓘ |
| fossilAbundance | one of the most abundant arthropods in the Burgess Shale ⓘ |
| fossilRange | Middle Cambrian (Wuliuan) ⓘ |
| foundInCountry | Canada NERFINISHED ⓘ |
| foundInRegion | British Columbia NERFINISHED ⓘ |
| geologicalPeriod | Cambrian NERFINISHED ⓘ |
| geologicalStage | Middle Cambrian NERFINISHED ⓘ |
| hasCommonName | lace crab (informal, misleading name) ⓘ |
| hasMorphologicalFeature |
antennae
ⓘ
biramous appendages ⓘ distinctive spined head shield ⓘ many trunk segments ⓘ pair of anterolateral head spines ⓘ two pairs of long posteriorly directed head spines ⓘ |
| hasSoftTissuePreservation | yes ⓘ |
| importance |
iconic fossil of the Burgess Shale
ⓘ
key taxon for understanding early arthropod evolution ⓘ |
| kingdom | Animalia ⓘ |
| knownFrom |
Burgess Shale
NERFINISHED
ⓘ
Stephen Formation NERFINISHED ⓘ |
| lifestyle | benthic ⓘ |
| likelyFeedingType |
deposit feeder
ⓘ
scavenger ⓘ |
| notableFor |
challenging traditional arthropod classification
ⓘ
unusual combination of arthropod characters ⓘ |
| order | Marrellida NERFINISHED ⓘ |
| phylum | Arthropoda NERFINISHED ⓘ |
| preservation | carbonaceous compression fossils ⓘ |
| relatedTo | other marrellomorph arthropods ⓘ |
| taxonomicStatus | extinct ⓘ |
| typeSpecies | Marrella splendens NERFINISHED ⓘ |
| usedIn |
studies of Burgess Shale-type preservation
ⓘ
studies of Cambrian explosion ⓘ |
| yearDescribed | 1912 ⓘ |
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: Marrella Description of subject: Marrella is an extinct, small, soft-bodied arthropod known from the Burgess Shale, notable for its distinctive spined head shield and importance in understanding early Cambrian marine ecosystems.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.