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121 / Paleozoic
Cooksonia
Cooksonia pertoni
Leafless stems only centimeters tall held spore capsules at their tips, marking an early step inland.
Structured expansion · editorial review pending
- Time range
- About 430–423 million years ago
- Final stage
- Late Silurian
- Geographic range
- Euramerican river wetlands · Present-day Britain and Europe
01 / ANSWER FIRST
What was Cooksonia?
This archive records Cooksonia under the scientific name Cooksonia pertoni, with an age of About 430–423 million years ago and a range of Euramerican river wetlands · Present-day Britain and Europe. Leafless stems only centimeters tall held spore capsules at their tips, marking an early step inland.
Cooksonia lacked true leaves and deep roots. Its slender axes forked repeatedly and ended in sporangia, while simple conducting tissue moved water through its upright body.
02 / QUICK FACTS
Cooksonia at a glance
- Scientific name
- Cooksonia pertoni
- Age
- About 430–423 million years ago
- Last recorded stage
- Late Silurian
- Known range
- Euramerican river wetlands · Present-day Britain and Europe
- Broad group
- plant
- Archive era
- Paleozoic
- Habitat signals
- Wetland
- Documented regions
- Europe
03 / ANATOMY
How was Cooksonia built?
Overall body plan
Leafless stems only centimeters tall held spore capsules at their tips, marking an early step inland.
Growth architecture
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Cooksonia, those observations must be separated from features added only for visual reconstruction.
Reproductive structures
Cooksonia lacked true leaves and deep roots. Its slender axes forked repeatedly and ended in sporangia, while simple conducting tissue moved water through its upright body.
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 Cooksonia.
04 / DIET & BEHAVIOUR
How did Cooksonia live?
Cooksonia lacked true leaves and deep roots. Its slender axes forked repeatedly and ended in sporangia, while simple conducting tissue moved water through its upright body. 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 Cooksonia live?
This archive currently lists About 430–423 million years ago; Euramerican river wetlands · Present-day Britain and Europe. 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
Euramerican river wetlands · Present-day Britain and Europe. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 430–423 million years ago, with the final recorded stage listed as Late Silurian. 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 Wetland. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Cooksonia?
Primary record
Compression fossils preserve branching stems, rounded sporangia and spores; microscopy reveals conducting tissues.
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 Cooksonia within About 430–423 million years ago and Euramerican river wetlands · Present-day Britain and Europe. 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.
08 / DISAPPEARANCE & DEBATE
Why did Cooksonia disappear?
Early land plants diversified rapidly, and forms with leaves, roots and more efficient transport replaced this simple architecture.
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
Cooksonia FAQ
What was Cooksonia?
This archive records Cooksonia under the scientific name Cooksonia pertoni, with an age of About 430–423 million years ago. Leafless stems only centimeters tall held spore capsules at their tips, marking an early step inland.
When did Cooksonia live?
The current archive range is About 430–423 million years ago; its youngest recorded stage is Late Silurian.
Where was Cooksonia found?
The archive currently lists Euramerican river wetlands · Present-day Britain and Europe. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Cooksonia?
Compression fossils preserve branching stems, rounded sporangia and spores; microscopy reveals conducting tissues.
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