Eleutherodactylus pipilans

Two subspecies are sometimes recognized:[2][3]

• Eleutherodactylus pipilans pipilans
• Eleutherodactylus pipilans nebulosus

E. p. nebulosus was first described as a separate species, but became treated as a subspecies by Duellman in 1958.[2][4] Common name nebulous chirping frog refers to this subspecies, whereas common name whistling chirping frog may either refer to the species as a whole or the nominotypical subspecies E. p. pipilans.[2] The subspecies differ in relative tympanum size and coloration.[3][5]

Adult males measure 23–29 mm (0.91–1.14 in) and females 21–29 mm (0.83–1.14 in) in snout–vent length. Skin of the dorsum is smooth or shagreened.[5] The eyes are relatively large. The tympanum is visible and oval in shape. The arms are long while the legs are relatively short.[3] The dorsal background color is dark brown to slightly lighter brown. There are yellow, orange, light brown, or greenish blotches or spots. The limbs are banded. Males have vocal slits.[3][5]

Its natural habitats are tropical seasonal forests[1] at elevations of 100–800 m (330–2,620 ft) above sea level.[2] Individuals are found in a range of microhabitats: on the rocks, on the ground, under rocks and debris,[1] and in a cave.[6] Although locally abundant and tolerating some habitat modification, it is threatened by habitat loss.[1]