The Japanese wrinkled frog (''Glandirana rugosa'') is a species of

true frog True frogs is the common name for the frog family Ranidae. They have the widest distribution of any frog family. They are abundant throughout most of the world, occurring on all continents except Antarctica. The true frogs are present in North A ...

native to

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

and introduced to

Hawaii Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...

in the late 19th century. It has sometimes been regarded as a single species with the

Imienpo Station frog The Imienpo Station frog (''Glandirana emeljanovi'') is a species of frog found in Northeast Asia. It has sometimes been regarded as a subspecies of the Japanese wrinkled frog, ''Glandirana rugosa'', with which it shares many characteristics. I ...

(''Glandirana emeljanovi'') which is found on the East Asian mainland. The two species are distinguished from others by their rough and uneven skin. It lives and breeds in various freshwater environments, including ponds, streams and wetlands. The IUCN does not consider this species to be faced by any significant threats.

References

Glandirana Endemic amphibians of Japan Amphibians described in 1838 {{Ranidae-stub