At least one (possibly 4) new species of dwarf lemur have been discovered in Madagascar:

• Lavasoa Dwarf Lemur: New Species Found on Madagascar, Sci-News

The Lavasoa dwarf lemur (Cheirogaleus lavasoensis) is found in only 3 isolated forest fragments in southern Madagascar, and the genetic analysis suggests many new species of dwarf lemur exist on the island.  I wrote an article about it on Wikipedia, and it may get featured on the main page soon (under In the News): https://en.wikipedia.org/wiki/Lavasoa_dwarf_lemur