Crossodactylus dispar Lutz, 1925, C. R. Mém. Hebd. Séances Soc. Biol. Filial., Paris, 93 (1925, vol. 2): 138. Syntypes: Not stated; including USNM 96738-40, according to Cochran, 1961, Bull. U.S. Natl. Mus., 220: 40; others possibly in AL-MNRJ. Type locality: "les montagnes de l'Etat de Rio-de-Janeiro", Brazil; corrected to "[Fazenda do] Bonito in the Serra de Bocaina", São Paulo, Brazil, by Cochran, 1955 "1954", Bull. U.S. Natl. Mus., 206: 246-248. Rendered as "Fazenda do Bonito, Serra da Bocaina, São José do Berreiro, São Paulo", Brazil by Bokermann, 1966, Lista Anot. Local. Tipo Anf. Brasil.: 30.
Calamobates Boulengeri De Witte, 1930, in Massart (ed.), Miss. Biol. Belge Brésil, 2: 219. Holotype: IRSNB 1.022 according to Lang, 1990, Doc. Trav., Inst. R. Sci. Nat. Belg., 59: 9. Type locality: "Réserve d'Alto da Serra près de Cubatan", São Paulo, Brazil; given as "Paranapiacaba (= Alto da Serra), São Paulo", Brazil by Bokermann, 1966, Lista Anot. Local. Tipo Anf. Brasil.: 224. Synonymy (with Crossodactylus fuscigula) by Lutz, 1930, Mem. Oswaldo Cruz, Rio de Janeiro, 24: 216.
Crossodactylus fuscigula Lutz, 1930, Mem. Oswaldo Cruz, Rio de Janeiro, 24: 211. Types: Not stated, presumably originally in Lutz Collection or IOC. now in MNRJ. Type locality: "pequeno corrego na Serra da Bocaina numa altura de 1150 metros", Alto da Serra de Cubatão. Synonymy (with Crossodactylus boulengeri) by Lutz, 1930, Mem. Oswaldo Cruz, Rio de Janeiro, 24: 215; with Crossodactylus dispar by implication of Lutz, 1930, Mem. Oswaldo Cruz, Rio de Janeiro, 24: 211, and by Cei, 1980, Monit. Zool. Ital., N.S., Monogr., 2: 314.
Crossodactylus dispar dispar — Lutz, 1951, O Hospital, 39: 707.
Rio Spinythumb Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 71).
Argentina (Misiones) and southeastern Brazil.
In the Crossodactylus trachystomus group of Caramaschi and Sazima, 1985, Rev. Brasil. Zool., 3: 43-49. See Cei, 1980, Monit. Zool. Ital., N.S., Monogr., 2: 314-316; and Heyer, Rand, Cruz, Peixoto, and Nelson, 1990, Arq. Zool., São Paulo, 31: 289-290, for accounts.
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