Ceratophrys cristiceps Müller, 1883, Kat. Herpetol. Samml. Basler Mus., 3: 8. Reprinted as Müller, 1885, Verh. Naturforsch. Ges. Basel, 7: 279). Holotype: NHMB 1503 according to Forcart, 1946, Verh. Naturforsch. Ges. Basel, 57: 122. Type locality: "Brasilien".
Stombus cristiceps — Miranda-Ribeiro, 1920, Rev. Mus. Paulista, São Paulo, 12: 302. Reig and Limeses, 1963, Physis, Buenos Aires, 24: 114.
Ceratophrys cristiceps — Nieden, 1923, Das Tierreich, 46: 385.
Proceratophrys cristiceps — Lynch, 1971, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 53: 134.
Muller's Smooth Horned Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 84).
eastern coastal region of northeastern Brazil, from the states of Rio Grande do Norte to Bahia, with a southern limit near Todos os Santos Bay.
Bokermann, 1966, Lista Anot. Local. Tipo Anf. Brasil.: 92, included Proceratophrys goyana as a synonym but provided no evidence to support this view. U. Caramaschi in Frost, 1985, Amph. Species World: 339, noted that this putative synonymy would be in error, as the species are quite distinctive. See account (as Ceratophrys cristiceps) by Cochran, 1955 "1954", Bull. U.S. Natl. Mus., 206: 228-230. Vieira, Vieira, and Santana, 2007, Zootaxa, 1397: 17-24, discussed comparative tadpole morphology. Cruz, Nunes, and Juncá, 2012, S. Am. J. Herpetol., 7: 110-122, reviewed the species and redelimited the range.
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