Atelopus lynchi

Adult males measure 35–41 mm (1.4–1.6 in)^[2][4][8] and adult females about 50 mm (2.0 in) in snout–vent length.^[4][8] The head is longer than it is wide and is narrower than the body. The snout is long and protruding. No tympanum is present. The fingers have basal webbing, but no fringes. The toes are webbed. The digits have distinct pads. The coloration is rather undistinguished (in contrast to its often colorful congeners): dorsal coloration is brown with indistinct dull yellow markings and the venter is dull blue-gray. The iris is black with pale green area surrounding the pupil.^[2]

Atelopus lynchi lives on the border between lowland and montane rainforest^[1] to montane rainforest^[4][8] to cloud forest^[8] at elevations of 800–1,410 m (2,620–4,630 ft) above sea level.^[1][3][4][8] It is terrestrial, but presumably reproduces in rivers.^[1] The type series was collected at night by streams, perched on leaves.^[2]

Atelopus lynchi was last observed in Ecuador in 1984.^[1][4] IUCN does not recognize records from Colombia and has assessed the species as being possibly extinct. Threats to it include deforestation for agricultural development, logging, and human settlement, as well as pollution resulting from the fumigation of illegal crops. Its disappearance after 1984 is also consistent with chytridiomycosis.^[1]