Melanophryniscus sanmartini Klappenbach, 1968, Comun. Zool. Mus. Hist. Nat. Montevideo, 9: 3. Holotype: MHNM 1676, by original designation. Type locality: "Villa Serrana, próximo a la represa del arroyo Aiguá, departamento de Lavalleja, República del Uruguay".
San Martin Redbelly Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 44).
Known only from three localities: the type locality (Departamento Lavalleja), the Cerro de Animas (Departamento de Maldonado) and Departamento de Rivera, Uruguay; likely to be found in adjacent Rio Grande do Sul, Brazil.
In the Melanophryniscus moreirae group of Cruz and Caramaschi, 2003, Bol. Mus. Nac., Rio de Janeiro, N.S., Zool., 500: 1-11. For discussion see Klappenbach, 1968, Comun. Zool. Mus. Hist. Nat. Montevideo, 9: 1-12. See Naya and Maneyro, 2001, Cuad. Herpetol., 15: 89-90, for Uruguayan distribution. Langone, 1995 "1994", Mus. Damaso Antonio Larrañaga, Ser. Divulg. 5: 32-33, and Achaval and Olmos, 2003, Anf. Rept. Uruguay, ed. 2: 18, provided for the Uruguayan population a brief account. Maneyro and Kwet, 2008, Stuttgart. Beit. Naturkd., Ser. A, Neue Ser., 1: 95-121, noted that one of the paratypes is of Melanophryniscus orejasmirandai. See statement of geographic range, habitat, and conservation status in Stuart, Hoffmann, Chanson, Cox, Berridge, Ramani, and Young, 2008, Threatened Amph. World: 612.
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