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125 / Paleozoic
Calamites
Calamites suckowii
Casts of jointed stems record large horsetail relatives; Calamites suckowii does not automatically name a plant with all organs known.
Structured expansion · editorial review pending
- Time range
- About 323–299 million years ago
- Final stage
- End of the Carboniferous
- Geographic range
- Euramerican rivers and coal swamps
01 / ANSWER FIRST
What was Calamites?
This archive records Calamites under the scientific name Calamites suckowii, with an age of About 323–299 million years ago and a range of Euramerican rivers and coal swamps. Casts of jointed stems record large horsetail relatives; Calamites suckowii does not automatically name a plant with all organs known.
Calamites chiefly names fossil jointed stems. Leaves, rhizomes and spore cones often have separate names, and a whole-plant reconstruction requires attachment or other explicit association evidence.
02 / QUICK FACTS
Calamites at a glance
- Scientific name
- Calamites suckowii
- Age
- About 323–299 million years ago
- Last recorded stage
- End of the Carboniferous
- Known range
- Euramerican rivers and coal swamps
- Broad group
- plant
- Archive era
- Paleozoic
- Habitat signals
- Wetland
- Documented regions
- Euramerican rivers and coal swamps
03 / ANATOMY
How was Calamites built?
Overall body plan
Casts of jointed stems record large horsetail relatives; Calamites suckowii does not automatically name a plant with all organs known.
Growth architecture
The available record is interpreted through preserved proportions, attachment surfaces, wear and comparison with related organisms. For Calamites, those observations must be separated from features added only for visual reconstruction.
Reproductive structures
Calamites chiefly names fossil jointed stems. Leaves, rhizomes and spore cones often have separate names, and a whole-plant reconstruction requires attachment or other explicit association evidence.
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 Calamites.
04 / DIET & BEHAVIOUR
How did Calamites live?
Calamites chiefly names fossil jointed stems. Leaves, rhizomes and spore cones often have separate names, and a whole-plant reconstruction requires attachment or other explicit association evidence. 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 Calamites live?
This archive currently lists About 323–299 million years ago; Euramerican rivers and coal swamps. 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 rivers and coal swamps. This boundary can change when specimens are reidentified or new localities are published.
Time window
About 323–299 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 Wetland. These labels help explore related records; a habitat reconstruction requires evidence from individual localities.
07 / FOSSIL EVIDENCE
What evidence supports reconstructions of Calamites?
Primary record
Stem casts preserve nodes and longitudinal ribs. Leaves, rhizomes and cones occurring in the same bed cannot be assigned to Calamites suckowii solely because they occur together.
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 Calamites within About 323–299 million years ago and Euramerican rivers and coal swamps. 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
Stem casts do not preserve an entire plant. Their formation and attachment to other organs require separate evidence before a reconstruction can be assigned to C. suckowii.
08 / DISAPPEARANCE & DEBATE
Why did Calamites disappear?
Coal-swamp change provides ecological context, but this species record does not establish a direct extinction cause or a direct transformation into living small horsetails.
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
Calamites FAQ
What was Calamites?
This archive records Calamites under the scientific name Calamites suckowii, with an age of About 323–299 million years ago. Casts of jointed stems record large horsetail relatives; Calamites suckowii does not automatically name a plant with all organs known.
When did Calamites live?
The current archive range is About 323–299 million years ago; its youngest recorded stage is End of the Carboniferous.
Where was Calamites found?
The archive currently lists Euramerican rivers and coal swamps. Species-level locality assignments and the full geographic range still require source-specific review.
How do scientists know about Calamites?
Stem casts preserve nodes and longitudinal ribs. Leaves, rhizomes and cones occurring in the same bed cannot be assigned to Calamites suckowii solely because they occur together.
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