View original imageThis is an original generative reconstruction, not a photograph or scientific plate.
128 / Mesozoic
Williamsonia
Williamsonia gigas
Flower-like reproductive organs nestled among cycad-like leaves, but this bennettitalean was not a flowering plant.
Structured expansion · editorial review pending
- Time range
- About 174–163 million years ago
- Final stage
- Middle Jurassic
- Geographic range
- Western Europe · Present-day Yorkshire, England
01 / ANSWER FIRST
What was Williamsonia?
This archive records Williamsonia under the scientific name Williamsonia gigas, with an age of About 174–163 million years ago and a range of Western Europe · Present-day Yorkshire, England. Flower-like reproductive organs nestled among cycad-like leaves, but this bennettitalean was not a flowering plant.
Williamsonia gigas names a bennettitalean ovulate organ. Associated leaves, stems and pollen organs have separate names; their reconstruction does not demonstrate ovules and pollen organs preserved together on one bisexual structure.
02 / QUICK FACTS
Williamsonia at a glance
- Scientific name
- Williamsonia gigas
- Age
- About 174–163 million years ago
- Last recorded stage
- Middle Jurassic
- Known range
- Western Europe · Present-day Yorkshire, England
- Broad group
- plant
- Archive era
- Mesozoic
- Habitat signals
- plant communities, soils, water availability and climate
- Documented regions
- Europe
03 / ANATOMY
How was Williamsonia built?
Overall body plan
Flower-like reproductive organs nestled among cycad-like leaves, but this bennettitalean was not a flowering plant.
Growth architecture
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Williamsonia, those observations must be separated from features added only for visual reconstruction.
Reproductive structures
Williamsonia gigas names a bennettitalean ovulate organ. Associated leaves, stems and pollen organs have separate names; their reconstruction does not demonstrate ovules and pollen organs preserved together on one bisexual structure.
Growth and individual variation
A single specimen does not define the whole species. Size, maturity, preservation and possible sex differences are considered before anatomical traits are treated as typical of Williamsonia.
04 / DIET & BEHAVIOUR
How did Williamsonia live?
Williamsonia gigas names a bennettitalean ovulate organ. Associated leaves, stems and pollen organs have separate names; their reconstruction does not demonstrate ovules and pollen organs preserved together on one bisexual structure. This ecological reconstruction is strongest where anatomy, associated organisms and the depositional setting point in the same direction.
05 / DIET & BEHAVIOUR
What shaped its ecological limits?
Its populations depended on plant communities, soils, water availability and climate. Changes in any one factor did not necessarily cause immediate extinction, but interacting pressures could reduce range, recruitment and resilience.
06 / RANGE & HABITAT
Where and when did Williamsonia live?
This archive currently lists About 174–163 million years ago; Western Europe · Present-day Yorkshire, England. Fossil or historical occurrence data describe where evidence has been found, not every place the taxon once occupied. Species-level age and range limits still require source-specific review.
Documented geographic range
Western Europe · Present-day Yorkshire, England. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 174–163 million years ago, with the final recorded stage listed as Middle Jurassic. Rock units and dating uncertainty mean the true biological range may extend beyond the known record.
Environmental setting
The archive uses the broad habitat labels plant communities, soils, water availability and climate. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Williamsonia?
Primary record
Ovulate organs and associated plant fossils constrain reconstruction, but association must be distinguished from direct attachment. This is not a confirmed angiosperm flower.
Comparative anatomy
Preserved structures are compared with close and functionally similar organisms. The method can constrain posture and function, but analogy alone cannot prove colour, behaviour or soft tissue.
Age and locality
Stratigraphy and occurrence records place Williamsonia within About 174–163 million years ago and Western Europe · Present-day Yorkshire, England. Reworked fossils and uncertain provenance are treated cautiously.
Open entity records
Links below connect the archive to available taxonomic and occurrence records. A matching name does not verify every ecological claim, and related-taxon links provide comparison rather than an exact species match.
Evidence limits for this record
The named fossil is an ovulate organ; whole-plant reconstructions must distinguish associated foliage and pollen organs from direct attachment.
08 / DISAPPEARANCE & DEBATE
Why did Williamsonia disappear?
The Middle Jurassic record of this species cannot be directly explained by the later expansion of angiosperms; this archive has no direct evidence for its extinction cause.
The last fossil or observation marks the youngest evidence currently known, not necessarily the death of the final individual. Explanations are strongest when timing, environmental change and population biology agree; otherwise the profile preserves uncertainty instead of assigning a single dramatic cause.
09 / FREQUENTLY ASKED QUESTIONS
Williamsonia FAQ
What was Williamsonia?
This archive records Williamsonia under the scientific name Williamsonia gigas, with an age of About 174–163 million years ago. Flower-like reproductive organs nestled among cycad-like leaves, but this bennettitalean was not a flowering plant.
When did Williamsonia live?
The current archive range is About 174–163 million years ago; its youngest recorded stage is Middle Jurassic.
Where was Williamsonia found?
The archive currently lists Western Europe · Present-day Yorkshire, England. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Williamsonia?
Ovulate organs and associated plant fossils constrain reconstruction, but association must be distinguished from direct attachment. This is not a confirmed angiosperm flower.
04 / SOURCES & FURTHER READING
Check the source record
Use the scientific name to compare taxonomy, occurrence records and the fossil record. Database coverage and classifications may differ.
05 / REVISION HISTORY
How has this record changed?
- Completed an AI-assisted bilingual audit of the archive record, corrected identified issues and clarified evidence limits; independent editorial review is pending.
- Expanded into a structured bilingual profile with anatomy, ecology, range, evidence, debate and FAQs; independent editorial review is pending.
- Verified authoritative entity sources and added three responsive reconstruction sizes.
- Initial bilingual species record published.
06 / CORRECTIONS & ADDITIONS