Mystery species discovered in trafficked pangolin scales
The pangolin is a mammal dressed up as a reptile with a coat of scales, sharp claws and sticky saliva. Wildlife experts often say they are the most trafficked mammals in the world as poachers target pangolins for their meat and their scales, which are used in traditional medicines. There are eight species, all under threat.
Or, sorry, make that nine species. Researchers have determined that scales confiscated in Hong Kong in 2012 and 2013 and in Yunnan, China, in 2015 and 2019 belong to a previously unrecognized pangolin species that has yet to be formally described — but is hiding in plain sight. The find was published Monday in the Proceedings of the National Academy of Sciences.
“The amount of data that was generated on the very limited sampling they have is exceptionally impressive,” said Matthew Shirley, a conservation biologist at Florida International University and chair of the IUCN SSC Pangolin Specialist Group who was not involved with the study.
To determine that the scales belonged to a new species, researchers analyzed 17 genomes sampled from the confiscated pangolin scales and compared them with 138 genomes from the eight known species of the animal. They also scrutinized the shape and structure of the scales and found features similar to those of Asian pangolins, suggesting the mystery animals fall within Manis, the group of the animals found in Asia, rather than in Africa.
The data confirmed the familial ties, and the researchers named the new species Manis mysteria.
While the ninth pangolin has yet to be found and formally described by scientists, that doesn't mean nobody knew it existed. “It's probably being captured and being called a Sunda pangolin or something like that,” Shirley said, referring to Manis javanica. This makes M. mysteria an example of cryptic diversity, where unique evolutionary lineages are difficult to recognize because they look similar to already known species. The researchers noted that they were unable to distinguish M. mysteria from other Asian pangolins by its scales alone.
It turned out that the confiscated scales had come from seven M. mysteria individuals. Using their genomes, the researchers were able to estimate that the armored animals diverged from other pangolin species “over 5 million years ago,” said HuaRong Zhang, a conservation geneticist at Kadoorie Farm and Botanic Garden in Hong Kong and an author of the paper.