cryptobranchus การใช้

A single species, the hellbender ( " Cryptobranchus alleganiensis " ) occurs in the eastern United States, while Asian species occur in both China and Japan.
A number of fossil cryptobranchids have been found, but there are only three living species, the Chinese giant salamander ( " Andrias davidianus " ), the Japanese giant salamander ( " Andrias japonicus " ) and the hellbender ( " Cryptobranchus alleganiensis " ) from North America.
A member of the family Cryptobranchidae, hellbenders are the only members of the genus " Cryptobranchus ", and are joined only by one other genus of salamanders ( " Andrias ", which contains the niche both as a predator and prey in their ecosystems, which either they or their ancestors have occupied for around 65 million years.