Sarcohyla cyclada (Campbell & Duellman 2000)

Member of the Hyla miotympanum group according to Duellman (1970) . Some specimens had previously been assigned to Hyla arborescandens (Duellman 1970; Caldwell 1974; Toal 1994; Toal and Mendelson 1995; Mendelson and Toal 1996) and Hyla celata (Toal and Mendelson 1995) . At night, the dorsum becomes pale tan, venter creamy white, and anterior and posterior surfaces dull yellowish tan. By day, dorsum tan with dark green reticulations and greenish wash posteriorly on body. Iris dark copper color. Fingers are webbed basally and the toes are about two thirds webbed. A distinct tympanum is present. Head as wide as body but slightly wider than long. Head width is 33.0 % SVL, head length is 32.5% SVL. Snouth moderately short and rounded in dorsal view, bluntly rounded in lateral view. Loreal region slightly concave. Lips moderately thin but not flared. Nostrils slightly protuberant, internarial region is slightly depressed. Tympanum oval, slightly higher than long; annulus is distinct and separated from eye by about 150% legnth of tympanum. Diameter of tympanum is 42.1% diameter of eye. Short ulnar tubercles form a row along the ventrolateral edge of the forearm, almost forming a low fold. Width of disc on third finger is greater than diameter of tympanum. Cloacal opening is directed posteroventrally at upper level of thighs. Vocal sac is single, median, subgular. Externally very similar to Hyla celata which is restricted to elevations above 2600 m in the Sierra Juarez. The tadpole for this species was originally illustrated in Duellman (1970) as Hyla arborescandens. Only tadpoles at Gosner (1960) Stage 25 are known. Similar to H. arborescandens in the presence of two rows of small marginal papillae, absence of submarginal papillae, presence of fine serrations on the beaks, and a denticle formula of 2/4.

Most specimens are from cloud forests at elevations between 1600 and 2180 m on the northern versant of the Sierra Juarez. At night, both sexes were found on low vegetation or boulders adjacent to small streams, but one male was found in a spray zone.

Sexual dimorphism is present in that males are significantly smaller than females, two males from higher elevations (Cerro Machin, 2370 m, and Cerro San Felipe, 2670 m) have SVLs of 37.5 and 38.0 mm while two females from the same areas have SVLs of 48.8 and 49.1 mm. Seems to be active year round.

Sarcohyla cyclada is a species of frog in the family Hylidae. It is endemic to the Sierra Madre de Oaxaca of Mexico.

Its natural habitats are temperate forests, subtropical or tropical moist montane forests, and intermittent rivers. It is threatened by habitat loss.