Biarmosuchus: Research Database
Biarmosuchia (Therapsida) · Late Permian (~260 MYA) · Europe — Russia (Mezen River Basin)
Research Note: Biarmosuchus was a biarmosuchian therapsid from the Late Permian of Russia — one of the earliest known therapsids and an important taxon for understanding therapsid evolution in the Permian.
| Research Finding | Status | Grade | Year | Method | Citation | Impact |
|---|---|---|---|---|---|---|
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Day et al. 2016: Biarmosuchus and new data on therapsid evolution from the Permian of Russia
Day et al. 2016 provide comprehensive data on Biarmosuchus from the Late Permian of Russia, establishing it as a biarmosuchian therapsid and documenting therapsid evolution in the Permian
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Confirmed | A | 2016 | Fossil | Day et al., Acta Palaeontologica Polonica | Taxonomy |
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Smith 1987: Biarmosuchus and additional data on Permian therapsid paleobiology
Smith 1987 provides additional data on Biarmosuchus and Permian therapsid paleobiology, further contextualising its significance within Biarmosuchia
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Confirmed | B | 1987 | Fossil | Smith, Palaeogeography, Palaeoclimatology, Palaeoecology | Paleobiology |
Active Debate: Early Therapsid Evolution in the Permian
Whether Biarmosuchus is a basal therapsid is debated. The evolution of therapsids in the Permian — and the rise of mammals — is key to understanding therapsid history.
What We Still Do Not Know About Biarmosuchus
- Complete skeletal morphology: Partial specimen known.
- Diet: Likely carnivorous.
- Social behavior: No direct evidence.
- Ecology: Unknown.
In Depth
Biarmosuchus is noted as being a primitive theraspid, the group of mammal like reptiles that evolved from the pelycosaurs, and whose descendents would go onto becoming the first mammals.
As a predator, Biarmosuchus was likely a fast hunter capable of running down its prey. This is evidenced by its long slender limbs that carried the body high off the ground by supporting the body from underneath instead of being sprawled out to the sides like its pelycosaur ancestors. Further the feet also point forwards indicating frequent forward locomotion at speed.
The dentition of Biarmosuchus is composed of eight smaller incisors at the front, followed by six canine teeth either side towards the middle. The first two of these canines were much larger than the others and were likely the main weapons that Biarmosuchus employed to hold onto prey and possibly deliver a killing bite.
As is commonly seen in predators, the skull of Biarmosuchus is wider at the rear than the snout. This has the effect of angling the eyes slightly forwards and enhancing prey detection. The extra width also allows for more powerful bite muscles, greatly increasing the killing potential of the canine teeth.
Further Reading
– Late Permian terrestrial vertebrates, USA and USSR. – Transactions of the American Philosophical Society, new series, 52: 1–224. – E. C. Plsen – 1962. – New Facts about the Fauna of the Upper Permian of the USSR – Journal of Geology, 73:117– 30 – P. K. Chudibov – 1965. – Biarmosuches from the Ocher Faunal Assemblage of Eastern Europe. – Paleontological Journal, v. 33, n. 3, p. 289-296. – M. F. Ivakhnenko – 1999.
