Bufo mazatlanensis Taylor, 1940 "1939", Univ. Kansas Sci. Bull., 26: 492. Holotype: EHT-HMS 374, by original designation; now FMNH 100027 according to Marx, 1976, Fieldiana, Zool., 69: 45. Type locality: "two miles east of Mazatlán, Sinaloa, Mexico".
Bufo nayaritensis Taylor, 1943, Univ. Kansas Sci. Bull., 29: 349. Holotype: EHT-HMS 397, by original designation; now FMNH 100043, according to Marx, 1976, Fieldiana, Zool., 69: 45. Type locality: "Tepic, Nayarit", Mexico. Synonymy by Langebartel and Smith, 1954, Herpetologica, 10: 126.
Bufo mazatlanensis mazatlanensis — Langebartel and Smith, 1954, Herpetologica, 10: 126.
Bufo mazatlanensis nayaritensis — Langebartel and Smith, 1954, Herpetologica, 10: 126.
Cranopsis mazatlanensis — 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 mazatlanensis — Frost, Grant, and Mendelson, 2006, Copeia, 2006: 558. by implication.
Incilius mazatlanensis — Frost, Mendelson, and Pramuk, 2009, Copeia, 2009: 418-419. By implication.
Sinaloa Toad (Liner, 1994, Herpetol. Circ., 23: 17; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 42; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 18).
Northern Sonora to Colima, along the Pacific coastal plain, Mexico.
In the former Bufo valliceps group of Martin, 1972, in Blair (ed.), Evol. Genus Bufo: 49. See accounts by Porter, 1964 "1963", Herpetologica, 19: 229-247, and Hardy and McDiarmid, 1969, Univ. Kansas Publ. Mus. Nat. Hist., 18: 82-84. See comment under Incilius gemmifer. Mendelson, Mulcahy, Williams, and Sites, 2011, Zootaxa, 3138: 1-34, suggested that this species is a member of a monophyletic Incilius valliceps group and in a subgroup they referred to as the Lowland group (the name Incilius valliceps subgroup is available—DRF) that includes Incilius gemmifer, Incilius luetkeni, Incilius mazatlanensis, Incilius nebulifer, and Incilius valliceps.
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