Appearance
Adult males measure 29–35 mm and adult females 44–51 mm in snout–vent length. The snout is rounded in profile and truncate in dorsal view. The tympanum is conspicuous but partly cover by the supratympanic fold. The fingers and the toes are partially webbed. The dorsum is dark tan, with variable markings. The limbs have dark crossbars. The lower surfaces are creamy white.
Naming
The specific name "deridens" is derived from Latin "deridere", meaning "make fun of someone". This alludes to the males calling from the treetops that sound "as if they are laughing at the collectors' vain attempts to reach them". Common name funny slender-legged treefrog has been coined for this species.
Status
"Osteocephalus deridens" inhabits Napo moist forests at elevations of 200–600 m above sea level. It occurs in the canopy of primary forest. Males call usually higher than 5 m above the ground, and the tadpoles develop in bromeliads, often higher than 15 m above the ground.This species is difficult to observe because of its arboreal lifestyle. It does not adapt well to anthropogenic disturbance and is threatened by habitat loss caused by agriculture and logging. It occurs in the Yasuni National Park.
Habitat
"Osteocephalus deridens" inhabits Napo moist forests at elevations of 200–600 m above sea level. It occurs in the canopy of primary forest. Males call usually higher than 5 m above the ground, and the tadpoles develop in bromeliads, often higher than 15 m above the ground.This species is difficult to observe because of its arboreal lifestyle. It does not adapt well to anthropogenic disturbance and is threatened by habitat loss caused by agriculture and logging. It occurs in the Yasuni National Park.
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