Bufo canaliferus Cope, 1877, Proc. Am. Philos. Soc., 17: 85. Syntypes: USNM 30315-24according to Kellogg, 1932, Bull. U.S. Natl. Mus., 160: 40, and Cochran, 1961, Bull. U.S. Natl. Mus., 220: 32 (although only one specimen noted in original description—DRF). Type locality: "West Tehuantepec", Oaxaca, Mexico; restricted by Smith and Taylor, 1950, Univ. Kansas Sci. Bull., 33: 339, to "Tapanatepec", Oaxaca, Mexico.
Cranopsis canalifera — Frost, Grant, Faivovich, Bain, Haas, Haddad, de Sá, Channing, Wilkinson, Donnellan, Raxworthy, Campbell, Blotto, Moler, Drewes, Nussbaum, Lynch, Green, and Wheeler, 2006, Bull. Am. Mus. Nat. Hist., 297: 364.
Ollotis canalifera — Frost, Grant, and Mendelson, 2006, Copeia, 2006: 558. by implication.
Incilius canaliferus — Frost, Mendelson, and Pramuk, 2009, Copeia, 2009: 418-419. By implication.
Dwarf Toad (Liner, 1994, Herpetol. Circ., 23: 16; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 41; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 18).
Isolated populations along the Pacific slopes of Oaxaca and Chiapas, Mexico, through Guatemala to El Salvador.
In the former Bufo canaliferus group of Martin, 1972, in Blair (ed.), Evol. Genus Bufo: 49. See account by Porter, 1964 "1963", Herpetologica, 19: 229-247. Köhler, Vesely, and Greenbaum, 2005 "2006", Amph. Rept. El Salvador: 25-27, provided an account (as Bufo canaliferus, and for El Salvador) and a color photograph. Mendelson, Mulcahy, Williams, and Sites, 2011, Zootaxa, 3138: 1-34, suggested that Incilius canaliferus is a members in an unnamed monophyletic group (the name Incilius marmoreus group is availabe-DRF) that includes Incilius canaliferus, Incilius marmoreus, and Incilius perplexus.
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