Salamanders with relatively flat head, small eyes and lacking parotoid glands. The skin is coarse and granular. Digits black and hardened distally. Can be distinguished from other (allopatric) species of Euproctus by the presence of a gular fold and the absence of spurs on the hind legs of males. Euproctus asper has a variable coloration, depending on geographic region, altitude and coloration of the substrate. The dorsum varies from gray and green to brown and black. Occasionally black spots are present. A yellow dorsal line, present in newly metamorphosed individuals, may fade with age or persist into adulthood. The venter is yellow to orange-red, and this coloration can extend to the ventral surfaces of the head and tail. Males are smaller (105-120 mm total length) than females (110-140 mm). Males usually have a relatively broader and longer head than females. The cloaca of the females is pear-shaped, bell-shaped or extended to a short tube. The cloacal opening is small and round and directed downward or backward. In males, the cloaca is hemispherical, and the opening is a longitudinal slit. The tail is shorter and higher in males than in females (Boehme et al 1999).