Scientists in Sydney have formally named a remarkable 240‑million‑year‑old amphibian fossil discovered in a garden retaining wall: Arenaerpeton supinatus. This giant predator, resembling a heavyset salamander with tusk‑like teeth, is considered one of the most important fossil finds in New South Wales in the past 30 years.
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| Illustration © Copilot — life reconstruction of the prehistoric amphibian Arenaerpeton supinatus, Sydney Basin, Australia. |
🦎 Discovery of Arenaerpeton supinatus
- Location: Sydney Basin, Australia.
- Age: ~240 million years old (Triassic period).
- Finder: A retired chicken farmer in the 1990s, who donated the fossil to the Australian Museum.
- Context: Found in rocks from a local quarry, originally intended for a garden retaining wall.
🔬 Scientific Significance
- Unique Preservation: Nearly complete skeleton with outlines of skin — extremely rare in paleontology.
- Classification: Belongs to temnospondyls, an extinct group of amphibians that lived before and during the dinosaurs.
- Size: Estimated length of 1.2 meters, much larger than most related species of its time.
- Features:
- Heavyset body compared to modern salamanders.
- Fang‑like tusks on the roof of its mouth.
- Likely preyed on ancient fish such as Cleithrolepis.
🧬 Evolutionary Importance
- Resemblance: Superficially similar to the modern Chinese Giant Salamander, but more robust.
- Longevity: Temnospondyls survived two mass extinction events; scientists suggest larger body size may have aided their survival.
- Heritage: Considered a key part of Australia’s fossil record, bridging ancient ecosystems with modern amphibians.
🏛️ Museum & Research
- Institutions Involved: UNSW Sydney and the Australian Museum.
- Lead Researchers: Lachlan Hart (PhD candidate, UNSW & Australian Museum) and Dr. Matthew McCurry (UNSW Senior Lecturer, Curator of Palaeontology).
- Publication: Journal of Vertebrate Paleontology.
- Exhibition: Fossil will be displayed at the Australian Museum in Sydney later this year.
📊 Quick Facts Table
| Feature | Detail |
|---|---|
| Name | Arenaerpeton supinatus (“supine sand creeper”) |
| Age | 240 million years |
| Length | ~1.2 m |
| Discovery | Retaining wall rocks, Sydney Basin |
| Group | Temnospondyl amphibians |
| Significance | Rare preservation of skeleton + skin |
🧭 Conclusion
This discovery highlights how chance finds — even in a garden wall — can reshape our understanding of prehistoric life. Arenaerpeton supinatus not only enriches Australia’s fossil heritage but also provides new insights into the survival strategies of ancient amphibians.
Source: UNSW Sydney Newsroom
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