Bufo perplexus Taylor, 1943, Univ. Kansas Sci. Bull., 29: 347. Holotype: EHT-HMS 707, by original designation; now FMNH 100053, according to Marx, 1976, Fieldiana, Zool., 69: 45. Type locality: "near the edge of the Balsas River, near the town of Mexcala, Guerrero, México".
Cranopsis perplexa — 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 perplexa — Frost, Grant, and Mendelson, 2006, Copeia, 2006: 558. by implication.
Incilius perplexus — Frost, Mendelson, and Pramuk, 2009, Copeia, 2009: 418-419. By implication.
Confusing Toad (Liner, 1994, Herpetol. Circ., 23: 17; Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 43; Liner and Casas-Andreu, 2008, Herpetol. Circ., 38: 18).
Balsas Basin of southern Mexico.
In the former Bufo marmoreus group of Martin, 1972, in Blair (ed.), Evol. Genus Bufo: 50. See map, description of geographic range and habitat, and conservation status (as Bufo perplexus) in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 190. Mendelson, Mulcahy, Williams, and Sites, 2011, Zootaxa, 3138: 1-34, suggested that Incilius canaliferus is a members in an a monophyletic group referred to as the Pacific Versant group (the name Incilius marmoreus group is available—DRF) that includes Incilius canaliferus, Incilius marmoreus, and Incilius perplexus.
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