About Osteocephalus yasuni Ron & Pramuk, 1999
Male Osteocephalus yasuni reach 44–56 mm (1.7–2.2 in) in snout–vent length, while females measure 43–62 mm (1.7–2.4 in) in the same measurement. The species' dorsum is brown and marked with dark brown spots. Ventral coloration differs between sexes and adult males range from bright yellow to yellowish cream, while adult females have cream ventral coloration. Adult males have rough skin, and adult females have smooth skin. This species has expanded discs on its fingers. The natural habitats of Osteocephalus yasuni are tropical primary moist forests, including both non-flooded terra firme forests and seasonally flooded forests. The species breeds in temporary pools. It is primarily nocturnal, but males can be heard calling during the daytime in certain months. Locally, the species faces negative impacts from habitat loss. However, there are no major threats to this reasonably abundant and widespread species, and it is found within several protected areas, including its namesake Yasuni National Park.
