Amblystoma tenebrosum Baird and Girard, 1852, Proc. Acad. Nat. Sci. Philadelphia, 6: 174. Holotype: Not stated; USNM 4710 according to Yarrow, 1882, Bull. U.S. Natl. Mus., 24: 152, and Cochran, 1961, Bull. U.S. Natl. Mus., 220: 6. Type locality: "Oregon", USA.
Xiphonura tenebrosa — Girard, 1858, U.S. Explor. Exped. 1838-1842, 20: 14.
Amblystoma tenebrosum — Cope, 1868 "1867", Proc. Acad. Nat. Sci. Philadelphia, 19: 202. Boulenger, 1882, Cat. Batr. Grad. Batr. Apoda Coll. Brit. Mus., Ed. 2: 49.
Chondrotus tenebrosus — Cope, 1887, Am. Nat., 21: 88.
Ambystoma tenebrosum — Stejneger and Barbour, 1917, Check List N. Am. Amph. Rept.: 11.
Dicamptodon tenebrosus — Good, 1989, Evolution, 43: 728.
Oregon Salamander (Yarrow, 1882, Bull. U.S. Natl. Mus., 24: 21).
Pacific Giant Salamander (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 28; Collins, 1997, Herpetol. Circ., 25: 6).
Coastal Giant Salamander (Crother, Boundy, Campbell, de Queiroz, Frost, Highton, Iverson, Meylan, Reeder, Seidel, Sites, Taggart, Tilley, and Wake, 2001 "2000", Herpetol. Circ., 29: 22; Tilley, Highton, and Wake, 2008, in Crother (ed.), Herpetol. Circ., 37: 17).
Pacific coast, coast ranges, and Cascade Mountains from southwestern British Columbia (Canada) to Mendocino County, California (USA).
This species was shown to be genetically distinct from Dicamptodon ensatus by Good, 1989, Evolution, 43: 728-744, who found a narrow hybrid zone between Dicamptodon ensatus and Dicamptodon tenebrosus in Mendocino County, California. Steele and Storfer, 2006, Mol. Ecol., 15: 2477-2487, reported on phylogeographic patterns. Raffaëlli, 2007, Les Urodèles du Monde: 73-74, provided a brief account.
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