As well as studying the animals in the wild, the researchers examined specimens from a total of 14 different natural history collections across Asia, Europe, and the US.
The two newly discovered species, Hylomys vorax and Hylomys macarong, were discovered in the collections of the Smithsonian and Drexel University in Philadelphia, where they had remained in drawers for several decades.
“We kind of say we can time travel as museum curators,” said Dr. Hawkins.
“We can pop down the hall, look in the collection, and go anywhere in the world.”
The researchers gathered enough genetic material from the three other species, which were previously categorised as subspecies, to reveal that they were biologically distinct.