en.wikipedia.org/wiki/Weasel

Current authoritative taxonomic sources list the valid species name as Mustela eversmanii Lesson, 1827. The Mammal Diversity Database explicitly says the valid name is Mustela eversmanii and notes that “the specific epithet has been spelt ‘eversmanni’ by some authors, but the original spelling of ‘eversmanii’ is used here”. ITIS likewise lists Mustela eversmanii as the valid species and treats Mustela eversmannii as a synonym rather than the accepted name.

So the article’s species-list entry uses a misspelling of the currently accepted scientific name.

This entry is presented as if Mustela tonkinensis were a currently accepted species in the genus. However, current taxonomic references consulted here do not treat it that way.

• ITIS lists Mustela tonkinensis Björkegren, 1941 as a synonym of the subspecies Mustela nivalis tonkinensis, not as a separate species.
• The Mammal Diversity Database says the southeast Asian forms tonkinensis, formosana, russelliana, and aistoodonnivalis have been treated in different ways historically, but that they are “all tentatively retained under M. nivalis” except M. aistoodonnivalis, which it recognizes separately.

So listing Mustela tonkinensis outright as a current species of Mustela does not match these current authorities.