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514 / Paleozoic
Tokummia
Tokummia katalepsis
Large pincer-like mandibles projected beneath a bivalved shell on an early mandibulate.
- Time range
- About 508 million years ago
- Final stage
- Middle Cambrian
- Geographic range
- Shallow muddy sea · Canada
01 / DEFINITION & ECOLOGY
What was Tokummia?
Tokummia (Tokummia katalepsis) was an extinct organism known from About 508 million years ago, with a range in Shallow muddy sea · Canada.
Life and ecology
It walked over the bottom and grasped soft prey or organic debris.
02 / DISAPPEARANCE
Why did Tokummia disappear?
Later mandibulate and crustacean radiations replaced the form.
03 / EVIDENCE
How do scientists know about Tokummia?
Fossils preserve valves, trunk, mandibles and tail while its exact position is still refined.
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