Japanese Wrinkled Frog, Glandirana rugosa

The Japanese Wrinkled Frog (Glandirana rugosa) is a species of true frog endemic to Japan and introduced to Hawaii in the late 19th century. It has occasionally been regarded as a single species with the Imienpo Station Frog, Glandirana emeljanovi, which is located on the East Asian mainland. The two species are distinguished from other frogs by their rough and uneven skin. It resides and breeds in a variety of freshwater environments, including ponds, streams, and wetlands. The IUCN doesn’t consider this species to be facing any significant threats.

The length of this species is roughly 4 centimeters.

The eggs of the wrinkled frog are laid in slow-moving water among protruding sticks and vegetation. Breeding has been recorded in February-July on Oahu. In Japan, the larvae overwinter before metamorphosing.

The diet consists mainly of insects.

Image Caption: Rana rugosa (Temminck et Schlegel, 1838). Credit: Wikipedia  (CC BY-SA 2.5)