IUCN threat status:

Critically Endangered (CR)

Comprehensive Description

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Description

Females measure around 36 mm SVL and males measure around 25 mm SVL. The head is as wide as it is long, with a triangular skull. The snout is truncate in dorsal view. The eyelid and canthus rostralis are flared. Tympanic membrane and tympanic annulus are absent. Vocal slits are present. Dorsal surfaces are smooth with a few wrinkles on the head and limbs. Warts are present in temporal area. The flanks has a few scattered and barely raised spiculae. The throat, chest, belly, and undersides of the forearm are rugose. Cloacal opening with surrounding skin is heavily wrinkled. Males have vocal slits and keratinized nuptial pads covering the dorsal and lateral surfaces of the thumb and the second finger. Fingers lack webbing and lateral fringes. Relative finger length is III>IV>II>I, with rounded pads on the digit tips. No folds are present on the distal end of the inner tarsus. Webbing covers all of the toes except for a portion of the fourth toe. Relative toe length is IV>V=III>II>I. While the thenar, palmar, and subarticular tubercles are distinct, the supernumerary palmar tubercle is absent.

The dorsum is black, with white spiculae on the flanks. The palmar and plantar tubercles are cream. The gular region has brown marks while the venter is black to cream with green and brown marks.

Tadpoles are Orton type IV and gastromyzophorous. They measure 16.2 mm in total length at stage 28. The body is elongately ovoid, and compressed dorsoventrally. The body is also constricted at the level of the eyes and at the spiracle. The eyes are dorsal and directed dorsolaterally. The tip of the tail is rounded. The spiracle is sinistral and half-free, while the vent is short and medial. Labia form an oral disc and surround the ventrally located mouth. Both marginal and submarginal papillae are present. Labial tooth row formula is 2/3. A large ventral suctorial disc covers the area from the posterior labium to the end of the body. The tadpole bodies are entirely black while the fins are clear with black specks.

The specific name nanay means sadness in Quechua, deriving from the extinction of many species of Atelopus frogs in the Ecuadorian Andes.

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