Physalaemus riograndensis Milstead, 1960

Class: Amphibia > Order: Anura > Family: Leptodactylidae > Subfamily: Leiuperinae > Genus: Physalaemus > Species: Physalaemus riograndensis

Physalaemus riograndensis Milstead, 1960, Copeia, 1960: 87. Holotype: FMNH 82578, by original designation. Type locality: "small pond flooded by rains . . . . 4 kilometers southeast of Osório, Rio Grande do Sul, Brazil".

English Names

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


Corrientes, Formosa, Santa Fé, Misiones, and Entre Rios provinces (Argentina), Uruguay, southern Paraguay (itapúa, Presidente Hayes, and Caazapá departments), and Rio Grande do Sul (Brazil).

Geographic Occurrence

Natural Resident: Argentina, Brazil, Paraguay, Uruguay


In the Physalaemus henselii group of Nascimento, Caramaschi, and Cruz, 2005, Arq. Mus. Nac., Rio de Janeiro, 63: 310. Tomatis, Baldo, Kolenc, and Borteiro, 2009, J. Herpetol., 43: 555-560, rejected this group as nonmonophyletic. See account by Cei, 1980, Monit. Zool. Ital., N.S., Monogr., 2: 402-404. Achaval and Olmos, 2003, Anf. Rept. Uruguay, ed. 2: 32, provided a brief account and photograph for the Uruguay population. Brusquetti and Lavilla, 2006, Cuad. Herpetol., 20: 18, briefly discussed the range in Paraguay. Chebez, Krauczuk, and Bosso, 1995, Cuad. Herpetol., 9: 58-59, reported the species in Misiones Province, Argentina, and Céspedez, 1996, Cuad. Herpetol., 10: 75-77, reported the species in Formosa, Argentina. Borteiro and Kolenc, 2007, Zootaxa, 1638: 1–20, described larval morphology from the Uruguay population. Weiler, Núñez, Airaldi, Lavilla, Peris, and Baldo, 2013, Anf. Paraguay: 106, provided a brief account, image, and dot map for Paraguay.  In the Physalaemus cuvieri clade, Physalaemus biligonigerus species group, of Lourenço, Targueta, Baldo, Nascimento, Garcia, Andrade, Haddad, and Recco-Pimentel, 2015, Mol. Phylogenet. Evol., 92: 204–216. Hepp and Pombal, 2020, Zootaxa, 4725: 1–106, discussed this species as part of a genus-wide discussion of bioacoustical traits among the species. Bueno-Villafañe, Emhart Vuletich, Baez, and Feltes-González, 2023, Rev. Latinoam. Herpetol., 6: 209–214, provided a record from the Department of Caazapá, Paraguay, and discussed the likely range of the species in that country. 

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