Physalaemus olfersii

The specific name olfersii honors Ignaz von Olfers, German naturalist, historian, and diplomat.[4]

Adult males measure 26–36 mm (1.0–1.4 in) and adult females 22–41 mm (0.9–1.6 in) in snout–vent length. The body is moderately robust. The head is longer than it is wide. The snout is pointed to sub-elliptical in dorsal view and acute in lateral view. The tympanum is in distinct as is the supra-tympanic fold. The fingers and the toes are thin and long and have slightly expanded tips; no webbing is present. Dorsal coloration varies from light brown to gray with small, irregular, and scattered brown blotches. A median line is present on the posterior 2/3 of the dorsum. The loreal region is dark brown with some dispersed white dots. A black stripe runs from the postorbital region to the anterior margin of the inguinal gland. A weak white line runs on the canthus rostralis, becoming well marked on the border of the upper eyelid and on the dorsolateral fold. The gular is dark gray with white dots that continue to the anterior part of the abdomen; the posterior of the abdomen is uniformly light brown. Males have a subgular vocal sac.[3]

Physalaemus olfersii occurs in primary and secondary forest at elevations below 1,200 m (3,900 ft). It lives in the leaf litter, on the ground, and in low vegetation. Breeding takes place in temporary and permanent ponds. It is a common species, although it probably can be threatened by habitat loss.[1]