The body length is about 50-60 mm from snout to vent; throat is smooth; vocal sacs
are light brown; male has vocal slits under the lower jaw; dorsal side of the body is light grey, olive green or light brown, some times black with numerous scattered small smooth tubercles and irregular black spots; ventrum is white and smooth, immaculate or with dark speckling or reticulation (Khan and Tasnim, 1989).
Also, Feng says, video analysis suggests that a double set of vocal sacs
contributes to the animals' virtuosity.--S.M.
Phrynohyas is one of four genera in the family Hylidae having paired lateral vocal sacs
. Four species of this genus are currently recognized according to size, structural features, coloration and cranial osteology (Duellman 1971).
Only males have vocal sacs
. When one male begins calling, others often join in.