Ghostly monkey among 224 new Mekong region species

A monkey with ghostly white circles around its eyes is among 224 new species listed in the World Wildlife Fund's latest update on the greater Mekong region.

The conservation group's report, released on Jan. 26, highlights the need to protect the rich biodiversity and habitats in the region, which includes Vietnam, Cambodia, Laos, Thailand and Myanmar.

The species listed were found in 2020 but last year's report was delayed. The monkey is called the Popa langur, for it lives on the steep hillsides of the extinct Mt. Popa volcano in Myanmar. It was the only new mammal. There are also dozens of newly identified reptiles, frogs and newts, fish and 155 plant species, including the only known succulent bamboo species, found in Laos.

The Mekong region is a biodiversity hotspot and home to tigers, Asian elephants, saola, an extremely rare animal also called the Asian unicorn or spindle horn, and thousands of other species.

Including this latest list, scientists have identified more than 3,000 new species in the region since 1997, the WWF said.

Scientists used measurements and samples from museum collections to compare and identify key differences with features of the newly discovered animals and plants, the report said.

Studying such differences can help determine the range of species and threats to their survival, Thomas Ziegler, a curator at the University of Cologne's Institute of Zoology, said in introducing the report.

Identifying new species is tricky, though, and sometimes can only be determined using a variety of methods, such as frog calls and genetic data used to distinguish the Cardamom leaf little frog, found high up in the Cardamom mountains in a wildlife refuge.

Some species are found in more than one...