who discovered it?
The State University of New York, Stony Brook University, and the University of Antananarivo.
Lavanify
Two teeth of "Lavanify" were discovered in 1995–1996 during joint expeditions of the State University of New York, Stony Brook University, and the University of Antananarivo to the late Cretaceous (mostly Maastrichtian, about 71 to 66 million years ago [mya]) Maevarano Formation of northwestern Madagascar. 
what is lavanify? A mammalian genus from the late Cretaceous.
wiki:19568059
Lavanify [SEP] Discovery and context
Two teeth of "Lavanify" were discovered in 1995–1996 during joint expeditions of the State University of New York, Stony Brook University, and the University of Antananarivo to the late Cretaceous (mostly Maastrichtian, about 71 to 66 million years ago [mya]) Maevarano Formation of northwestern Madagascar. The two teeth were found in different sites in a white sandstone unit of the Maevarano Formation near the village of Berivotra and have been deposited in the collections of the University of Antananarivo (specimen UA 8653) and Field Museum of Natural History (specimen FMNH PM 59520). David W. Krause and colleagues described "Lavanify" and a sudamericid from India, which they did not name, in a 1997 paper in "Nature".