Ceratophrys appendiculata Günther, 1873, Ann. Mag. Nat. Hist., Ser. 4, 11: 418. Holotype: BMNH according to Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 223. Type locality: "Brazil".
Ceratophrys cafferi Camerano, 1879, Atti Accad. Sci. Torino, Cl. Sci. Fis. Mat. Nat., 14: 880. Holotype: MZUT An540, according to Gavetti and Andreone, 1993, Cat. Mus. Reg. Sci. Nat., Torino, 10: 51. Type locality: "Brasile . . . . nelle foreste vergini dell Serra degli Organi" (= Organ Mountains, Brazil). Given as "Serra dos Órgaos, Terezópolis, Rio de Janeiro", Brazil by Bokermann, 1966, Lista Anot. Local. Tipo Anf. Brasil.: 25. Synonymy by Boulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 222.
Stombus appendiculatus — Miranda-Ribeiro, 1920, Rev. Mus. Paulista, São Paulo, 12: 302.
Ceratophrys appendiculata — Nieden, 1923, Das Tierreich, 46: 382. Cochran, 1955 "1954", Bull. U.S. Natl. Mus., 206: 223.
Stombus appendiculatus appendiculatus — Miranda-Ribeiro, 1926, Arq. Mus. Nac., Rio de Janeiro, 27: 125.
Stombus appendiculatus var. unicolor Miranda-Ribeiro, 1926, Arq. Mus. Nac., Rio de Janeiro, 27: 125. Syntypes: MNRJ, by original designation. Recorded as MNRJ 0298 by Prado and Pombal, 2008, Arq. Zool., São Paulo, 39: 32. Type locality: "Alto da Serra—S[ão]. Paulo—Santos", Brazil. Given as "Japuíba, Cachoeiras de Macacu, Rio de Janeiro" by Prado and Pombal, 2008, Arq. Zool., São Paulo, 39: 32.
Stombus appendiculatus — Reig and Limeses, 1963, Physis, Buenos Aires, 24: 114.
Stombus appendiculatus incolor — Bokermann, 1966, Lista Anot. Local. Tipo Anf. Brasil.: 92. Incorrect subsequent spelling.
Proceratophrys appendiculata — Lynch, 1971, Misc. Publ. Mus. Nat. Hist. Univ. Kansas, 53: 134.
Guenther's Horned Frog (Cochran, 1961, Living Amph. World: 88).
Günther's Horned Frog (Ananjeva, Borkin, Darevsky, and Orlov, 1988, Dict. Amph. Rept. Five Languages: 91).
Gunther's Smooth Horned Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 84).
Forests in the central part of Rio de Janeiro (state) and eastern eastern São Paulo, Brazil.
See Izecksohn, Cruz, and Peixoto, 1999 "1998", Rev. Univ. Rural, Ser. Cienc. Vida, 20: 37-54, for discussion. See Prado and Pombal, 2008, Arq. Zool., São Paulo, 39: 1-85 [32-38], for account.
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