Osornophryne antisana, the Napo plump toad, is a species of toad in the family Bufonidae.
It is endemic to Ecuador. Its natural habitats are subtropical or tropical moist montane forests, subtropical or tropical high-altitude shrubland, and subtropical or tropical high-altitude grassland.
It is threatened by habitat loss.
Distribution The species is endemic to Ecuador's Cordillera Real mountains. It is found at elevations of , and has an extent of occurrence around .
The species is found near lakes, and in Páramo and forest habitats. Individuals have been found under stones and dead Espeletia plants.
Taxonomy The species was described in 1987.
Description The back is yellow to dark or greyish-brown. The iris is black with gold flecks. The snout-vent length is up to in males, and up to in females. The back has small warts, and the sides have small to medium warts.
Conservation Osornophryne antisana is classified as endangered. Its habitat is fragmented, and declining in extent and quality. The species may also be threatened by pollution and fires.
Etymology The species is named after the Antisana Volcano, in Antisana Ecological Reserve. The holotype was found on the volcano's slopes.
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