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Pacific giant salamander
The family includes only a single genus, Dicamptodon. The genus was formerly thought to contain two species, Cope's giant salamander (D. copei) on the Olympic Peninsula, Washington, and the Pacific giant salamander (D. ensatus) which consisted of three geographic populations, an Idaho isolate, a group in northern California, and a group in Oregon and Washington. In 1989, genetic studies showed D. copei to be a distinct subspecies, and the D. ensatus populations to consist of three subspecies: the Idaho giant salamander (D. aterrimus) in Idaho, and two highly divergent species with a narrow hybrid zone in California, the coastal giant salamander (D. tenebrosus) (ranging from northern California to Washington), and the California giant salamander (D. ensatus) (limited only from Santa Cruz County to Mendocino County in California).
Specimens are up to 30 cm (12 in) long, and are found in the western USA and south western British Columbia. Except for their size, they are similar to the mole salamander family (Ambystomatidae), in which they were originally included.
While most salamanders are silent, the Pacific giant salamander is one of several salamanders that have vocal abilities. When startled, these salamanders may respond with a croaky-sounding cry similar to that of a barking dog. Members of this family can either be terrestrial or aquatic as adults.
- Ronald A. Nussbaum (1976-04-23). "Geographic variation and systematics of salamanders of the genus Dicamptodon Strauch (Ambystomatidae)". Miscellaneous Publications Museum of Zoology, University of Michigan, No. 149. Retrieved 2011-09-29.
- David A. Goode (July 1989). "Hybridization and Cryptic Species in Dicamptodon (Caudata: dicamptodontidae)". Evolution: 728–744. Retrieved 2011-09-29.
- Frost, Darrel R., Grant, Taran, Faivovich, Julián, Bain, Raoul H, Haas, Alexander, Haddad, Celio F. B, De Sa, Rafael O, Channing, A, Wilkinson, Mark, Donnellan, Stephen C, Raxworthy, Christopher J., Campbell, Jonathan A., Blotto, Boris L., Moler, Paul., Drewes, Robert C., Nussbaum, Ronald A., Lynch, John D., Green, David M., Wheeler, Ward C. 2006. The amphibian tree of life. Bulletin of the AMNH ; no. 297 (http://digitallibrary.amnh.org/dspace/bitstream/2246/5781/1/B297.pdf)