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Ambystomatidae
Amphiumidae
Cryptobranchidae
Hynobiidae
Plethodontidae
Proteidae
Rhyacotritonidae
Salamandridae
Sirenidae
Hynobius retardatus
Ezo Salamander
Range
Japan: Hokkaido
IUCN Red Book
Least Concern
CITES
No listing
First described
Dunn, 1923