(from the article `Caudata`) ...to marginal teeth; no fossil record; northern Asia from the Ural Mountains to Japan and Taiwan; 8 genera (including Hynobius) and about 36 ... Salamanders are very ancient survivors of a Mesozoic (245 to 66.4 million years ago) radiation. The cryptobranchids, sirenids, proteids, and ... [2 related arti...
[n] - large aquatic salamanders: hellbenders
family Cryptobranchidae noun large aquatic salamanders: hellbenders; giant salamanders