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103 / Paleozoic
Ichthyostega
Ichthyostega stensioei
Weight-bearing limbs accompanied a fish-like tail in an animal still deeply tied to water.
Structured expansion · editorial review pending
- Time range
- About 365–360 million years ago
- Final stage
- Late Devonian
- Geographic range
- Greenland rivers and floodplains
01 / ANSWER FIRST
What was Ichthyostega?
This archive records Ichthyostega under the scientific name Ichthyostega stensioei, with an age of About 365–360 million years ago and a range of Greenland rivers and floodplains. Weight-bearing limbs accompanied a fish-like tail in an animal still deeply tied to water.
Ichthyostega was an early tetrapod whose powerful forelimbs could raise the body, while its hind limbs had limited motion. It swam efficiently and probably made awkward movements across shallows and banks.
02 / QUICK FACTS
Ichthyostega at a glance
- Scientific name
- Ichthyostega stensioei
- Age
- About 365–360 million years ago
- Last recorded stage
- Late Devonian
- Known range
- Greenland rivers and floodplains
- Broad group
- amphibian or stem tetrapod
- Archive era
- Paleozoic
- Habitat signals
- Wetland
- Documented regions
- North America
03 / ANATOMY
How was Ichthyostega built?
Overall body plan
Weight-bearing limbs accompanied a fish-like tail in an animal still deeply tied to water.
Limbs, girdles and vertebral column
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Ichthyostega, those observations must be separated from features added only for visual reconstruction.
Skull and aquatic adaptations
Ichthyostega was an early tetrapod whose powerful forelimbs could raise the body, while its hind limbs had limited motion. It swam efficiently and probably made awkward movements across shallows and banks.
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 Ichthyostega.
04 / DIET & BEHAVIOUR
How did Ichthyostega live?
Ichthyostega was an early tetrapod whose powerful forelimbs could raise the body, while its hind limbs had limited motion. It swam efficiently and probably made awkward movements across shallows and banks. 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 freshwater, wet ground, seasonal climate and shoreline vegetation. 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 Ichthyostega live?
This archive currently lists About 365–360 million years ago; Greenland rivers and floodplains. 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
Greenland rivers and floodplains. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 365–360 million years ago, with the final recorded stage listed as Late Devonian. 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 Ichthyostega?
Primary record
Skulls, ribs, vertebrae, feet and tail bones reveal this transitional way of moving.
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 Ichthyostega within About 365–360 million years ago and Greenland rivers and floodplains. 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 Ichthyostega disappear?
Late Devonian environmental and faunal turnover erased its branch from the record.
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
Ichthyostega FAQ
What was Ichthyostega?
This archive records Ichthyostega under the scientific name Ichthyostega stensioei, with an age of About 365–360 million years ago. Weight-bearing limbs accompanied a fish-like tail in an animal still deeply tied to water.
When did Ichthyostega live?
The current archive range is About 365–360 million years ago; its youngest recorded stage is Late Devonian.
Where was Ichthyostega found?
The archive currently lists Greenland rivers and floodplains. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Ichthyostega?
Skulls, ribs, vertebrae, feet and tail bones reveal this transitional way of moving.
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