Bufo diptychus Cope, 1862, Proc. Acad. Nat. Sci. Philadelphia, 14: 353. Holotype: USNM 5841, by original designation (apparently lost); not mentioned in USNM type list by Cochran, 1961, Bull. U.S. Natl. Mus., 220, or for ANSP by Malnate, 1971, Proc. Acad. Nat. Sci. Philadelphia, 123: 345-375. Type locality: Not mentioned specifically, but the Page Expedition visited many localities now in Brazil, northeastern Argentina, and southern Paraguay, along the drainages of the Paraná and Paraguai Rivers.
Chaunus diptychus — 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. Savage and Bolaños, 2009, Zootaxa, 2005: 4. By implication.
Rhinella diptycha — Chaparro, Pramuk, and Gluesenkamp, 2007, Herpetologica, 63: 211. by implication.
Cope's Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 41).
Northwestern Paraguay, presumably into adjacent Brazil.
Of uncertain relationships. Thought by Cope, 1863, Proc. Acad. Nat. Sci. Philadelphia, 15: 50, to be synonymous with Bufo poeppigii as did Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 292.
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