Charadrahyla trux (Adler & Dennis 1972)

Hyla trux is a member of the Hyla taeniopus species group and is found in the cloud forests of the Sierra Madre del Sur, Guerrero, Mexico. The skin of the dorsum and the undersurfaces of arms, head and lower legs is smooth. Ventral skin of the body and thighs are granular. Head, body, limbs, and feet are dorsally pale brown with dark chocolate brown blotches of many different shapes found across many parts of the body. There are clusters of iridophores spread out unevenly over the body, head, and limbs. The iris is yellowish golden with black reticulations. The tympanum is a pale brown.The axillae and groin are pale blue. Vocal slits are absent, prevomerine teeth present. Fingers are one-half webbed, toes three-fourths webbed. Dorsally, the snout is long and slightly pointed with no rostral keel and is round when viewed from the side. The tympanum is small, distinct, and round with a strong supratympanic fold (which extends from posterior border of eye to above the insertion of the arm) covers the upper edge of the tympanum. Fingers are moderately long 1

The type locality for Hyla trux is 11.4 km southwest of Puerto del Gallo, Guerrero, Mexico at an elevation of 1985 m. The frogs were found in a variety of areas, along cascading mountain streams flowing through cool, moist, oak-pine or (at lower elevations) bamboo-tree fern cloud forests near Cerro Teotepec, Guerrero, at leevations between 1760-2120 m (Adler and Dennis 1972).

Extensive nuptial excrescences on thumb, but also found along proximo-distal bordering of each finger in males. Webbing is hypertrophied between toes one and two in sexually mature males. Variation in snout shape is present, where large adult males have a pointed snout and immature males and females and more rounded.

The spine-fingered tree frog (Charadrahyla trux) is a species of frog in the family Hylidae endemic to Mexico. Its natural habitat is subtropical or tropical moist montane forests and rivers. It is found in the Sierra Madre del Sur of Guerrero state, on Cerro Teotepec between 1,450 and 2,415 meters elevation, and northwest of Asoleadero. Its extent of occurrence (EOO) is 478 km2.

As it is thought to be restricted to a limited area, and to be threatened by habitat loss and possibly chytridiomycosis, it is currently classified as endangered.