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150 / Paleozoic
Sphenophyllum
Sphenophyllum emarginatum
Six wedge-shaped leaves encircled each node of a slender stem that trailed across the ground or climbed larger trees.
Structured expansion · editorial review pending
- Time range
- About 315–299 million years ago
- Final stage
- End of the Carboniferous
- Geographic range
- Euramerican coal-forest understory
01 / ANSWER FIRST
What was Sphenophyllum?
This archive records Sphenophyllum under the scientific name Sphenophyllum emarginatum, with an age of About 315–299 million years ago and a range of Euramerican coal-forest understory. Six wedge-shaped leaves encircled each node of a slender stem that trailed across the ground or climbed larger trees.
Sphenophyllum was related to horsetails but remained a small scrambling plant. Toothed or lobed leaves grew in whorls, and compact cones carried rings of sporangia.
02 / QUICK FACTS
Sphenophyllum at a glance
- Scientific name
- Sphenophyllum emarginatum
- Age
- About 315–299 million years ago
- Last recorded stage
- End of the Carboniferous
- Known range
- Euramerican coal-forest understory
- Broad group
- plant
- Archive era
- Paleozoic
- Habitat signals
- Forest
- Documented regions
- Euramerican coal-forest understory
03 / ANATOMY
How was Sphenophyllum built?
Overall body plan
Six wedge-shaped leaves encircled each node of a slender stem that trailed across the ground or climbed larger trees.
Growth architecture
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Sphenophyllum, those observations must be separated from features added only for visual reconstruction.
Reproductive structures
Sphenophyllum was related to horsetails but remained a small scrambling plant. Toothed or lobed leaves grew in whorls, and compact cones carried rings of sporangia.
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 Sphenophyllum.
04 / DIET & BEHAVIOUR
How did Sphenophyllum live?
Sphenophyllum was related to horsetails but remained a small scrambling plant. Toothed or lobed leaves grew in whorls, and compact cones carried rings of sporangia. 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 Sphenophyllum live?
This archive currently lists About 315–299 million years ago; Euramerican coal-forest understory. 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 coal-forest understory. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 315–299 million years ago, with the final recorded stage listed as End of the Carboniferous. 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 Forest. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Sphenophyllum?
Primary record
Complete compressions preserve nodes, leaf whorls and cones, documenting its abundance across the coal-forest floor.
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 Sphenophyllum within About 315–299 million years ago and Euramerican coal-forest understory. 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 Sphenophyllum disappear?
The collapse of coal forests removed humid understory habitat and many of the giant trees it used for support.
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
Sphenophyllum FAQ
What was Sphenophyllum?
This archive records Sphenophyllum under the scientific name Sphenophyllum emarginatum, with an age of About 315–299 million years ago. Six wedge-shaped leaves encircled each node of a slender stem that trailed across the ground or climbed larger trees.
When did Sphenophyllum live?
The current archive range is About 315–299 million years ago; its youngest recorded stage is End of the Carboniferous.
Where was Sphenophyllum found?
The archive currently lists Euramerican coal-forest understory. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Sphenophyllum?
Complete compressions preserve nodes, leaf whorls and cones, documenting its abundance across the coal-forest floor.
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