Fossils in China suggest 237-million-year-old armoured amphibian lived in the sea
The Facts
- Research published in Nature Ecology & Evolution reports that amphibians lived in the sea 237 million years ago. Nature only
- Two fossils of a temnospondyl, a group of primitive amphibians, were found in what is now Guizhou province, China, which was a salty sea during the Late Triassic. Nature only
- The researchers provisionally named the species Gerrothorax maritimus; the animals were 74 cm long, had flattened bodies and were almost completely covered in body armour. Nature only
- Strontium isotope levels in the bones matched those of seawater at the time, which the researchers say suggests the animals grew up drinking seawater. Nature only
- The researchers argue the skeletons' excellent preservation, far from any land mass existing at the time, suggests the animals were not swept there by water. Nature only
Dive deeper · 2 more factsShow less
- None of the more than 8,000 modern amphibian species lives exclusively in a marine environment. Nature only
- Steve Brusatte of the University of Edinburgh said that if the amphibian was fully marine, it would be a 'game changer'. Co-author Ryosuke Motani of UC Davis said salt-tolerant amphibians usually recover from excess salt by drinking fresh water. Nature only
Context
A study led by Diao, Motani, Jiang, Hao and Wang describes fossils from southern China that the authors interpret as evidence of a fully marine amphibian in the Late Triassic. Modern amphibians have varying salt tolerance but none lives exclusively in the sea.
The marine interpretation rests on fossil preservation and strontium isotope data. An outside researcher quoted by Nature described the finding as significant conditional on the animal having been fully marine.
How the Agent Panel Scored This
Independent AI personas each scored importance 1–10; the story's score is a trimmed mean (highest and lowest votes dropped). Vote spread: 1.
| 3 | Business Analyst | This is a niche paleontology discovery about a single extinct amphibian species, with no market, economic, or regulatory impact, only scientific interest. |
| 3 | News Editor | This is a single-study paleontology finding about an extinct amphibian from one source, with limited impact on most people and no immediate widespread consequences, so it fits the minor-news range. |
| 2 | Informed Citizen | This is a paleontology study describing a single extinct amphibian species from fossils, with no immediate effect on ordinary people and little relevance beyond scientific interest. |