Giant Salamander May be the World's Biggest Amphibian

Published September 17th, 2019 - 12:22 GMT
Giant salamander (Twitter)
Giant salamander (Twitter)
Highlights
The large salamander is presumed to still live in the wild, but is likely also mistaken for Chinese giant salamanders, which together had been thought a single species.

A giant salamander whose species had been misidentified for more than 70 years may be the world's biggest amphibian.

The animal had lived at London Zoo for 20 years before being preserved in the collections of the Natural History Museum in London.

Experts had believed that the creature was a Chinese giant salamander, a species that is currently critically endangered.

However, a new analysis of salamander DNA has revealed it as a new species that is actually bigger that its Chinese cousin, making it the largest amphibian in the world.

The specimen had been held in the museum's collection for 74 years before the misidentification was corrected.

The large salamander is presumed to still live in the wild, but is likely also mistaken for Chinese giant salamanders, which together had been thought a single species.

The new species has been named the South China giant salamander. 

It can reach nearly 6.5 feet (2 metres) in length — making it the largest of the 8,000 amphibian species that are alive today.

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Researchers from the Zoological Society of London and the Natural History Museum used DNA from 17 museum specimens collected in the early 20th century, along with tissue samples from wild salamanders, revealing three genetic lineages.

These were from different river systems and mountain ranges across China, with the team concluding that the species likely diverged more than three million years ago.

'Our analysis reveals that Chinese giant salamander species diverged between 3.1 and 2.4 million years ago,' said lead paper author Samuel Turvey of  the Zoological Society of London.

'These dates correspond to a period of mountain formation in China as the Tibetan Plateau rose rapidly, which could have isolated giant salamander populations and led to the evolution of distinct species in different landscapes,' he added.

The team identified three types of salamander, including Andrias davidianus, the Chinese giant salamander and Andrias sligoi, the South China giant salamander — and a third species which is yet to be named.

The classification of the South China giant salamander was first proposed in the 1920s, and was based on an unusual salamander from southern China that lived in London Zoo for 20 years.

The idea was abandoned at the time, but has now been resurrected and confirmed by Professor Turvey and his colleagues.

Researchers used the exact same individual animal — which had been preserved and kept as a specimen in the Natural History Museum for the last 74 years — to define the characteristics of the new species.

The third and unnamed new species, which lives in the Yellow Mountains of eastern China, is still only known from tissue samples and has yet to be formally described.

'The decline in wild Chinese giant salamander numbers has been catastrophic, [and] mainly due to recent overexploitation for food,' said Professor Turvey.

'We hope that this new understanding of their species diversity has arrived in time to support their successful conservation.'

'But urgent measures are required to protect any viable giant salamander populations that might remain.'

'Salamanders are currently moved widely around China, for conservation translocation and to stock farms that cater for China's luxury food market,' he added.

'Conservation plans must now be updated to recognise the existence of multiple giant salamander species, and movement of these animals should be prohibited to reduce the risk of disease transfer, competition, and genetic hybridisation.'

Researchers said that the study highlights how museum collections can play an essential role in the conservation of critically endangered species.

'These findings come at a time where urgent interventions are required to save Chinese giant salamanders in the wild,' said conservation geneticist Melissa Marr, of the Natural History Museum London.

'Our results indicate that tailored conservation measures should be put in place that preserve the genetic integrity of each distinct species.'

The full findings of the study were published in the journal Ecology and Evolution.

This article has been adapted from its original source.


© Associated Newspapers Ltd.

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