Engystomops petersi Jiménez de la Espada, 1872

Class: Amphibia > Order: Anura > Family: Leptodactylidae > Subfamily: Leiuperinae > Genus: Engystomops > Species: Engystomops petersi

Engystomops Petersi Jiménez de la Espada, 1872, An. Soc. Esp. Hist. Nat., 1: 86. Type(s): Not traced, presumably originally in MNCN. Type locality: "Oriente en el Ecuador"; probably Napo-Pastaza [Ecuador], according to Peters, 1955, Rev. Ecuat. Entomol. Parsitol., 2: 349.

Engystomops petersiiBoulenger, 1882, Cat. Batr. Sal. Coll. Brit. Mus., Ed. 2: 276.

Eupemphix paraensis Müller, 1923, Zool. Anz., 57: 39. Holotype: ZSM 139/1911, lost, according to Glaw and Franzen, 2006, Spixiana, München, 29: 172. Type locality: "Peixeboi (an der Bragançabahn), Staat Parà, Nord-Brasilien". Synonymy by Lynch, 1970, Copeia, 1970: 488-496.

Eupemphix schereri Myers, 1942, Proc. Biol. Soc. Washington, 55: 151. Holotype: CAS-SU 6317, by original designation. Type locality: "Pevas, at mouth of the Ampiyaco River, [Departamento Loreto,] Amazonian Peru". Synonymy by Lynch, 1970, Copeia, 1970: 488-496; and Cannatella and Duellman, 1984, Copeia, 1984: 911.

Physalaemus petersiLynch, 1970, Copeia, 1970: 488-496.

Engystomops petersiNascimento, Caramaschi, and Cruz, 2005, Arq. Mus. Nac., Rio de Janeiro, 63: 312.

English Names

Peters’ Dwarf Frog (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 83).


North of the Río Marañon and Río Amazonas in eastern Ecuador, eastern Peru, and southeastern Colombia; localities from the mouth of the Amazon, Surinam, Bolivia, and French Guiana are problematically assigned to this species.

Geographic Occurrence

Natural Resident: Brazil, Colombia, Ecuador, Peru

Likely/Controversially Present: Bolivia, French Guiana, Suriname


Lescure and Marty, 2000, Collect. Patrimoines Nat., Paris, 45: 260-261, provided a photo and brief account for French Guiana. Rodríguez and Duellman, 1994, Univ. Kansas Mus. Nat. Hist. Spec. Publ., 22: 71–72, provided a brief account, as Physalaemus petersi, for the Iquitos region of northeastern Peru.  Márquez, De la Riva, and Bosch, 1995, J. Zool., London, 237: 313–336, reported on vocalization in a population assigned to this nominal species in Bolivia, although its current assignment is unclear. Boul and Ryan, 2004, Copeia, 2004: 624–631, discussed population variation in complex advertisement calls. See comment under Physalaemus freibergi. Funk, Caldwell, Peden, and Padial, 2007, Mol. Phylogenet. Evol., 44: 825-837, provided mtDNA sequence evidence of three well-delimited populations that might be species, one in the upper Napo drainage of Ecuador and adjacent Peru, another from the Juruá and Madre de Díos drainages of Peru and adjacent Brazil, and a third from Pará, Brazil. Fouquet, Gilles, Vences, Marty, Blanc, and Gemmell, 2007, PLoS One, 10 (e1109): 1–10, provided molecular evidence that this is a species complex. Funk, Angulo, Caldwell, Ryan, and Cannatella, 2008, Herpetologica, 64: 290-304, discussed the distinction between Engystomops petersi and Engystomops freibergi (both as Physalaemus), detailed their ranges and noted that populations from the Guianas had not yet been assigned to either species. Ernst, Rödel, and Arjoon, 2005, Salamandra, 41: 179-194, suggested that "Physalaemus" (in the sense of including Engystomops) had not been recorded for Guyana prior to their record of Physalaemus sp., so inclusion of that country in the range of this species may be in error. Metcalf, Marsh, Torres Pacaya, Graham, and Gunnels, 2020, Herpetol. Notes, 13: 753–767, reported the species from the Santa Cruz Forest Reserve, Loreto, northeastern Peru. Taucce, Costa-Campos, Carvalho, and Michalski, 2022, Eur. J. Taxon., 836: 96–130, reported on distribution, literature, and conservation status for Amapá, Brazil. Gagliardi-Urrutia, García Dávila, Jaramillo-Martinez, Rojas-Padilla, Rios-Alva, Aguilar-Manihuari, Pérez-Peña, Castroviejo-Fisher, Simões, Estivals, Guillen Huaman, Castro Ruiz, Angulo Chávez, Mariac, Duponchelle, and Renno, 2022, Anf. Loreto: 138–139, provided a brief account, photograph, dot map, and genetic barcode for Loreto, Peru. Nascimento, de Sá, and Garcia, 2022, J. Morphol., 283: 1299–1317, reported on larval external, oral and skeletal morphology. Crnobrna, Santa-Cruz Farfan, Gallegos, López-Rojas, Llanqui, Panduro Pisco, and Kelsen Arbaiza, 2023, Check List, 19: 445, provided a record from Ucayali Department, central-eastern Peru.

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