Scientists know it exclusively from the type locality: 1390 meters above sea level in the western Sierra Madre del Sur, in Oaxaca.

[2][3][1] The adult male frog measures 81.15–85.75 mm in snout-vent length and the adult female frog 67.91–73.21 mm.

Its large size distinguishes it from other members of the genus.

They have hypertrophied webbed skin between their toes.

Only frogs from this part of the world have webbing of this kind.