Osteocephalus yasuni
The adult male frog is 44–55.7 mm long from nose to rear end and the adult female frog 42.6–61.9 mm.  The skin on the adult frog's back is the color of coffee with darker marks.  The skin on the tops of the feet is also the color of coffee with darker stripes.  The belly of the aduly male frog can be bright yellow or cream yellow.  The belly of the adult female frog is the color of cream.  The iris of the eye is bronze in color with black marks.  It is possible to see the bones of the feet through the skin: the bones are white in color.