Engystoma Mülleri Boettger, 1885, Z. Naturwiss., Halle, 58: 241. Type(s): Not designated; SMF 4113 (formerly 1161.1a, according to Boettger, 1892, Kat. Batr. Samml. Mus. Senckenb. Naturforsch. Ges.: vi) registered as holotype, according to Mertens, 1967, Senckenb. Biol., 48(A): 50. Type locality: "Paraguay, Amer. merid. "
Hypopachus mülleri — Peracca, 1895, Boll. Mus. Zool. Anat. Comp. Univ. Torino, 10 (195): 23. Miranda-Ribeiro, 1926, Arq. Mus. Nac., Rio de Janeiro, 27: 189.
Hypopachus muelleri — Boulenger, 1895, Zool. Rec., 31: 40. Boulenger, 1898, Proc. Zool. Soc. London, 1898: 126.
Dermatonotus mülleri — Méhely, 1904, Ann. Hist. Nat. Mus. Natl. Hungarici, 2: 208.
Gastrophryne muelleri — Stejneger, 1910, Proc. Biol. Soc. Washington, 23: 166.
Dermatonotus muelleri — Nieden, 1926, Das Tierreich, 49: 72. Cei, 1980, Monit. Zool. Ital., N.S., Monogr., 2: 153.
Muller's Termite Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 89).
Central and southern Chaco, Rio Grande de Santiago, and Corrientes provinces (Argentina); eastern Bolivia; Paraguay; Brazil, from Maranhão to Goiás and São Paulo.
Synonymy and review in Cei, 1980, Monit. Zool. Ital., N.S., Monogr., 2: 153-155; also see Alonso de Arámburu, 1953, Not. Mus. La Plata, Zool., 16: 273-285. Silva, Silva, and França e Souza, 2002, Herpetol. Rev., 33: 144, provided records for Goiás, Brazil. Brusquetti and Lavilla, 2006, Cuad. Herpetol., 20: 21, briefly discussed the range in Paraguay. Jansen, Bloch, Schulze, and Pfenninger, 2011, Zool. Scripta, 40: 567-583, reported on genetic variation in Bolivia.
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