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Cryptobranchid Salamanders from the Paleocene and Miocene of Saskatchewan
Bruce G. Naylor
Vol. 1981, No. 1 (Feb. 10, 1981), pp. 76-86
Stable URL: http://www.jstor.org/stable/1444042
Page Count: 11
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A new species of Cryptobranchus from the upper Paleocene Ravenscrag Formation (Tiffanian) of Saskatchewan is represented by dentaries, fragmentary maxillae, parts of two vertebrae, and a partial exoccipital. This is the earliest known cryptobranchid and, although fragmentary, the material indicates an hypothesis of ancestry of the new species to later cryptobranchids. Two vertebrae from the upper Miocene Wood Mountain Formation of Saskatchewan are referable to Cryptobranchus ("Andrias") matthewi and are probably from an individual larger than any previously known salamander. Known fossil and Recent distributions are discussed in terms of centers of origin and patterns of dispersal. It is suggested that all known cryptobranchids are properly placed in the genus Cryptobranchus.