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490 / Paleozoic
Trimerorhachis
Trimerorhachis insignis
External gills and a long body show a temnospondyl that remained aquatic throughout life.
- Time range
- About 290–275 million years ago
- Final stage
- Early Permian
- Geographic range
- Freshwater channels and ponds · Texas, USA
01 / DEFINITION & ECOLOGY
What was Trimerorhachis?
Trimerorhachis (Trimerorhachis insignis) was an extinct organism known from About 290–275 million years ago, with a range in Freshwater channels and ponds · Texas, USA.
Life and ecology
It ambushed fish and invertebrates in turbid shallows and sometimes gathered densely in seasonal water.
02 / DISAPPEARANCE
Why did Trimerorhachis disappear?
Early Permian freshwater-predator turnover removed it.
03 / EVIDENCE
How do scientists know about Trimerorhachis?
Bone beds, skeletons, gill arches and gut contents reveal its life history; cannibalism remains debated.
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?
- Verified authoritative entity sources and added three responsive reconstruction sizes.
- Initial bilingual species record published.
06 / CORRECTIONS & ADDITIONS