Lavanify is a mammalian genus from the late Cretaceous (probably Maastrichtian, about 71 to 66 million years ago) of Madagascar.

One of the two teeth is 11.2 mm high and shows a deep furrow and, is centered laterally in the crown, a V-shaped area that consists of dentine.

Characters shared by the teeth of Lavanify and Bharattherium include the presence of an infundibulum and a furrow; they both also have large, continuous bands of matrix (unbundled hydroxyapatite crystals) between the prisms (bundles of hydroxyapatite crystals) of the enamel, and perikymata—wave-like ridges and grooves in the enamel surface.

[2] Gondwanatheres are a small group of mammals of uncertain phylogenetic affinities known from the late Cretaceous to the Eocene (~56–34 mya) of the Gondwanan continents, known only from teeth and a few lower jaws.

These include Gondwanatherium from the Campanian and Maastrichtian of Argentina; Sudamerica from the Paleocene (~66–56 mya) of Argentina; Lavanify; at least one species from the Maastrichtian of India; an unnamed species related to Sudamerica from the Eocene of Antarctica; and an unnamed possible gondwanathere, TNM 02067, from the Cretaceous of Tanzania.

Krause and colleagues could not determine whether the teeth were from the lower or upper jaw and whether they were molars or molariform (molar-like) premolars, but suggested that they represented two different tooth positions.

[8] FMNH PM 59520 resembles the Gondwanatherium fossil MACN Pv-RN 1027,[9] a broken tooth that may be an upper molariform.

[10] In both Lavanify teeth, the enamel surface features perikymata (ridges and grooves arranged in a transverse, wave-like pattern).

It is similar in many respects to UA 8653, but is less curved and its occlusal surface contains a large infundibulum (funnel-shaped cavity), filled with cementum and surrounded by enamel that penetrates deeply into the tooth.

Krause and colleagues tentatively placed this tooth in Lavanify in view of the considerable variation among other gondwanathere teeth of a single species and in the absence of evidence to the contrary.

Wilson and colleagues list two autapomorphies (unique derived traits) of Lavanify: presence of a V-shaped dentine island and absence of enamel on one side of the crown.