I see what's look like "Cataphyll" (covering sheath). No marginal collecting veins at the edge of leaves. No "Geniculum" at the petiolar insertion, seems waxy underside, grown attached to a tree trunk.
Seems like a Philodendron, but No idea of the species, since there are so many and you are in Brazil, there are too many possibilities, young aroid can be vary different from mature one, later when it matures it will be easier to point the species
