Description

E. unicolor is a small species, in average 15mm SVL. The color is grayish brown with a pair of light lines from the eyes to the dorsal side of the thighs. The digital disks are very small and the legs are very muscular compared with other Eleutherodactylus of Puerto Rico (Rivero 1998) .

It is not known if E. unicolor was originally restricted to the Sierra de Luquillo or if its distribution included other elfin forests in the Cordillera Central of Puerto Rico. The intense agriculture that destroyed most of the forested areas of the island up to the first half of the 20th century may have pushed this species to extinction in the rest of its habitat. The Sierra de Luquillo was protected since the Spanish crown took Puerto Rico as a colony in the 15th century.