Atelopus balios Peters, 1973

Rio Pescado stubfoot toad



Taxonomy & Nomenclature



Conservation Status

Last record: April 1995

Rediscovered in October 2010

IUCN RedList status: Critically Endangered



Azuay, Cañar, and Guayas Provinces, Ecuador (south-western)


Biology & Ecology










Original scientific description:

Peters, J. A. (1973). The frog genus Atelopus in Ecuador (Anura: Bufonidae). Smithsonian Contributions to Zoology [1973]: 1-49.


Other references:

Coloma, L.A. and Almeida-Reinoso, D. 2012. Ex situ management of five extant species of Atelopus in Ecuador: assisted reproduction essays for A. balios, A. elegans, A. nanay, A. spumarius, and A. sp.. Centro Jambatu de Investigación y Conservación de Anfibios/Fundación Otonga.

Coloma, L. A. and Lötters, S. (1996). The tadpole of Atelopus balios (Anura: Bufonidae) from the Pacific lowlands of Ecuador. Herpetologica [1996]: 66-70.

Galarza, Jomira Katherine Yánez. (2022). Detection of the lethal fungus Batrachochytrium dendrobatidis (Chytridiomycota) and molecular characterization of cultivable skin bacteria associated with three critically endangered species of Atelopus (Anura: Bufonidae) in Ecuador.

IUCN SSC Amphibian Specialist Group. 2018. Atelopus balios. The IUCN Red List of Threatened Species 2018: e.T54491A98640710. Downloaded on 06 July 2018.

Jaynes, Kyle E. et al. (2022). Harlequin frog rediscoveries provide insights into species persistence in the face of drastic amphibian declines. Biological Conservation 276: 109784.

La Marca, E., Lips, K.R., Lötters, S., Puschendorf, R., Ibáñez, R., Rueda-Almonacid, J.V., Schulte, R., Marty, C., Castro, F., Manzanilla-Puppo, J., Garcia-Perez, J.E., Toral, E., Bolaños, F., Chaves, G., Pounds, J.A. and Young, B. (2005). Catastrophic population declines and extinctions in Neotropical harlequin frogs (Bufonidae: Atelopus). Biotropica: 190-201.

Lötters, S. (1996). The Neotropical Toad Genus Atelopus. Checklist - Biology - Distribution. Vences, M. and Glaw, F. Verlags GbR, Köln, Germany.

Manzano-Pasquel, A.L. 2014. Revisiting the enigmatic: Emergence of Bd coincide with amphibian decline in Los Andes of Ecuador. Department of Biology Ecology, Evolution and Conservation, San Francisco State University.

Moore, R.D. 2011. The Search for "Lost" Frogs. FrogLog 95: 13-16.

Parker III, T.A. and Carr, J.L. 1992. Status of forest remnants in the Cordillera de la Costa and adjacent areas of southwestern Ecuador. RAP Working Papers: 1-172.

Pounds, J.A., Bustamante, M.R., Coloma, L.A., Consuegra, J.A., Fogden, M.P.L., Foster, P.N., La Marca, E., Masters, K.L., Merino-Viteri, A., Puschendorf, R., Ron, S.R., Sánchez-Azofeifa, G.A., Still, C.J. and Young, B.E. 2006. Widespread amphibian extinctions from epidemic disease driven by global warming. Nature 439: 161-167.

Ron, S.R., Guayasamin, J.M and Menéndez-Guerrero, P. 2011. Biodiversity and Conservation Status of Amphibians of Ecuador. In: H. Heatwole, C.L. Barrio-Amoros and H.W. Wilkinson (eds), Amphibian Biology, pp. 129-170. Surrey Beatty & Soons PTY Limited, Baulkham Hills, Australia.


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