Osornophryne sumacoensis is a species of toad in the family Bufonidae. It is endemic to Ecuador and only found in the forests surrounding a small crater lake on the eastern slopes of Sumaco, a volcano in the Napo Province.
Description Osornophryne sumacoensis females measure about in snout–vent length (mean of three individuals). The skin has many tubercles. The back and limbs are blueish-black, and the belly is blue with black spots. The head is small.
Osornophryne sumacoensis can be active during both the day and the night. It is a terrestrial species. During the daytime, specimens have been found under leaf-litter.
Reproduction Osornophryne sumacoensis has direct development. Eggs are laid on soil under vegetation.
Habitat and conservation Osornophryne sumacoensis inhabits the cloud forest surrounding the lake, at asl. The forest is dominated by bamboo (Chusquea sp.), Ficus, and other trees up to tall.
The species lives within the Sumaco Napo-Galeras National Park. Volcanic eruption is a threat to this species, which is restricted to a single location.
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