Ascaphus truei Stejneger, 1899, Proc. U.S. Natl. Mus., 21: 900. Holotype: USNM 25979. Type locality: "Humptulips, [Gray's Harbor County,] Washington", USA.
Ascaphus truei truei — Mittleman and Myers, 1949, Proc. Biol. Soc. Washington, 62: 62.
Ascaphus truei californicus Mittleman and Myers, 1949, Proc. Biol. Soc. Washington, 62: 63. Holotype: MVZ 19142, by original designation. Type locality: "near Klamath, Del Norte County, Calif[ornia].", USA. See comment.
American Discoglossoid Toad (Dickerson, 1906, The Frog Book: 51).
American Bell Toad (Storer, 1925, Univ. California Publ. Zool., 27: 43; Wright and Wright, 1933, Handb. Frogs Toads U.S. Canada: ix; Stebbins, 1951, Amph. W. North Am.: 126).
American Ribbed Toad (Slevin, 1928, Occas. Pap. California Acad. Sci., 16: 79; Wright and Wright, 1933, Handb. Frogs Toads U.S. Canada: 36).
Bell's Toad (Vincent, 1947, Nature Notes from Crater Lake, 13: 20).
Tailed Frog (Schmidt, 1953, Check List N. Am. Amph. Rept., Ed. 6: 57; Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 5; Stebbins, 1966, Field Guide W. North Am. Rept. Amph.: 54; Collins, Huheey, Knight, and Smith, 1978, Herpetol. Circ., 7: 10; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 38; Collins, 1997, Herpetol. Circ., 25: 11; Crother, Boundy, Campbell, de Queiroz, Frost, Highton, Iverson, Meylan, Reeder, Seidel, Sites, Taggart, Tilley, and Wake, 2001 "2000", Herpetol. Circ., 29: 6).
California Tailed Frog (Ascaphus truei californicus [no longer recognized]: Schmidt, 1953, Check List N. Am. Amph. Rept., Ed. 6: 57; Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 5).
Olympic Tailed Frog (Ascaphus truei truei [no longer recognized]: Schmidt, 1953, Check List N. Am. Amph. Rept., Ed. 6: 57; Conant, Cagle, Goin, Lowe, Neill, Netting, Schmidt, Shaw, Stebbins, and Bogert, 1956, Copeia, 1956: 5).
Coastal Tailed Frog (Frost, McDiarmid, and Mendelson, 2008, in Crother (ed.), Herpetol. Circ., 37: 4; Frost, McDiarmid, Mendelson, and Green, 2012, in Crother (ed.), Herpetol. Circ., 39: 14).
Pacific Tailed Frog (Collins and Taggart, 2009, Standard Common Curr. Sci. Names N. Am. Amph. Turtles Rept. Crocodil., ed. 6: 8).
Southwestern British Columbia (Canada) south in high-gradient stream areas through western Washington, western Oregon, and into northwestern California (USA).
See account by Metter, 1968, Cat. Am. Amph. Rept., 69: 1-2 (including what is now Ascaphus montanus). Metter, 1964, Copeia, 1964: 181-195, rejected subspecies (including what is now Ascaphus montanus) but noted extensive morphological variation over relatively short geographic distances. Nielson, Lohman, and Sullivan, 2001, Evolution, 55: 147-160, noted strong phylogeographic loyalty to various mountain ranges of which the Oregon Coast Range forms the sister taxon of the Siskiyous, Olympics, and Northern Cascades. Nielson, Lohman, Daugherty, Allendorf, Knudsen, and Sullivan, 2006, Herpetologica, 62: 235-258, supported the previous distinction of Ascaphus montanus and Ascaphus truei, and noted that two "Evolutionarily Significant Units" (i.e., species under phylogenetic or evolutionary definitions—DRF): 1) populations from the Olympic Mountains, and 2) populations south of the Umpqua River in Washington.
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