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Pristimantis ridens Cope 1866

Least Concern (IUCN 3.1)
Pristimantis ridens
Adult Pristimantis ridens



Species description based on Savage (2002). A small frog (males to 19 mm, females to 25 mm).

Pristimantis ridens Adult 1 Pristimantis ridens Adult 2 Pristimantis ridens Adult 3


Dorsal coloration is pale brown or yellow, with some pink undertones. A slightly darker W-shaped patch is often present just behind the head. Other individuals have a single middorsal stripe or parallel dorsolateral stripes. The thighs are barred. The dorsal skin is smooth.

Pristimantis ridens Dorsal 1 Pristimantis ridens Dorsal 2 Pristimantis ridens Dorsal 3 Pristimantis ridens Dorsal 4


The ventral surface is yellow with some dark specks.

Pristimantis ridens Ventral 1 Pristimantis ridens Ventral 2

Distinguishing characteristics

Pristimantis ridens has a characteristic dark bar just above the tympanum.


The upper half of the iris is beige and the lower half is coppery.

Pristimantis ridens Eye 1

Ecology behavior and evolution


The diet consists of a variety of small arthropods, predominantly spiders and ants (Lieberman 1986).


This species is fairly common in premontane habitat (Savage 2002). It may be found on low vegetation at night or hiding in the leaf litter during the day (Savage 2002, Lieberman 1986).


A short trill (Ibanez, Rand and Jaramillo 1999).

Taxonomy and systematics



Cope 1866


Eleutherodactylus lutosus molinoi, Eleutherodactylus ridens, Hypodictyon ridens, Phyllobates ridens, Syrrhopus molinoi, Syrraphus ridens, Syrrophus ridens, Syrrhopus ridens

Type locality

St. Juan River, Nicaragua

Habitat and distribution


Lowland, premontane and lower montane forest to 1600 m.


Costa Rica, Ecuador, Honduras, Nicaragua, Panama


Pristimantis ridens distribution
Distrubution map (IUCN)


Altig, R, M Whiles, and CL Taylor. 2007. What do tadpoles really eat? Assessing the trophic status of an understudied and imperiled group of consumers in freshwater habitats. Freshwater Biology 52(2): 386-395.

Barbour, T. 1928. New Central American frogs. Proceedings of the New England Zoological Club. Cambridge, Massachusetts 10: 25-31.

Bell, KE and MA Donnelly. 2006. Influence of forest fragmentation on community structure of frogs and lizards in northeastern Costa Rica. Influencia de la fragmentación del bosque sobre la estructura comunitaria de ranas y lagartijas en el noreste de Costa Rica. Conservation Biology 20(6): 1750-1760.

Bursey, CR and DR Brooks. 2010. Nematode Parasites of 41 Anuran Species from the Area de Conservación Guanacaste, Costa Rica. Comparative Parasitology 77(2):221-231.

Cope, ED. 1866. Fourth contribution to the herpetology of tropical America. Proceedings of the Academy of Natural Sciences of Philadelphia 18: 123-132.

Dunn, ER. 1931. The amphibians of Barro Colorado Island. Occasional Papers of the Boston Society of Natural History 5: 403-421.

Goldberg, SR & CR Bursey. 2008. Helminths from fifteen species of frogs (Anura, Hylidae) from Costa Rica. Phyllomedusa 7(1): 25-33

Guyer, C and MA Donnelly. 2005. Amphibians and Reptiles of La Selva, Costa Rica and the Caribbean Slope: A Comprehensive Guide. University of California Press, Berkeley.

Hedges, SB, WE Duellman and MP Heinicke. 2008. New World direct-developing frogs (Anura: Terrarana): molecular phylogeny, classification, biogeography, and conservation. Zootaxa 1737: 1-182.

Heyer, WR. 1967. A herpetofaunal study of an ecological transect through the Cordillera de Tilarán, Costa Rica. Copeia 1967(2): 259-271

Ibañez, R, AS Rand, and CA Jaramillo. 1999. Los anfibios del Monumento Natural Barro Colorado, Parque Nacional Soberanía y areas adyacentes. Mizrachi, E and SA Pujol. Santa Fe de Bogota.

Ibáñez, R, F Solís, C Jaramillo, and S Rand. 2000. An overwiew of the herpetology of Panama. In: Johnson, JD, RG Webb, and OA Flores-Villela. Eds. Mesoamerican Herpetology: Systematics, Zoogeography and Conservation. The University of Texas at El Paso, El Paso, Texas.

Köhler, G. 2001. Anfibios y Reptiles de Nicaragua. Herpeton, Offenbach, Germany.

Lieberman, SS. 1986. Ecology of the leaf litter herpetofauna of a Neotropical rain forest La Selva, Costa Rica. Acta Zoologica Mexicana Nueva Serie 15: 1-72.

Lynch, JD and WE Duellman. 1997. Frogs of the genus Eleutherodactylus in western Ecuador: Systematics, ecology, and biogeography. University of Kansas Museum of Natural History Special Publication 23: 1-236.

Lynch, JD. 1980. Systematic status and distribution of some poorly known frogs of the genus Eleutherodactylus from the Chocoan lowlands of South America. Herpetologica 36(2): 175-189.

McCranie, JR and LD Wilson. 2002. The Amphibians of Honduras. Society for the Study of Amphibians and Reptiles Contributions to Herpetology 19: 1-625.

Miyamoto, MM. 1984. Central American frogs allied to Eleutherodactylus cruentus: allozyme and morphological data. Journal of Herpetology 18(3): 256-263.

Noble, GK. 1918. The amphibians collected by the American Museum Expedition to Nicaragua in 1916. Bulletin of the American Museum of Natural History 38: 311-347.

Picco, AM and JP Collins. 2007. Fungal and viral pathogen occurrence in Costa Rican amphibians. Journal of Herpetology 41(4): 746–749.

Pounds, JA, MPL Fogden, JM Savage, and GC Gorman. 1997. Tests of null models for amphibian declines on a tropical mountain. Conservation Biology 11(6): 1307-1322.

Puschendorf, R, F Bolanos, and G Chaves. 2006. The amphibian chytrid fungus along an altitudinal transect before the first reported declines in Costa Rica. Biological Conservation 132(1): 136-142.

Ruiz-Carranza, PM, MC Ardila-Robayo, and JD Lynch. 1996. Lista actualizada de la fauna de Amphibia de Colombia. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales: 365-415.

Savage, JM. 1981. The systematic status of Central American frogs confused with Eleutherodactylus cruentus. Proceedings of the Biological Society of Washington 94: 413-420.

Savage, JM. 2002. The Amphibians and Reptiles of Costa Rica: A Herpetofauna between two Continents, between two Seas. University of Chicago Press, Chicago.

Schlaepfer, MA and TA Gavin. 2001. Edge effects on lizards and frogs in tropical forest fragments. Conservation Biology 15(4): 1079-1090.

Sunyer, J, G Paiz, DM Dehling, and G Kohler. 2009. A collection of amphibians from Río San Juan, southeastern Nicaragua. Herpetology Notes 2: 189-202.

Taylor, EH. 1952. A review of the frogs and toads of Costa Rica. Revisión de las ranas y sapos de Costa Rica. The University of Kansas Science Bulletin: 35(1): 577-941.

Wang, IJ, AJ Crawford, and E Bermingham. 2008. Phylogeography of the Pygmy Rain Frog (Pristimantis ridens) across the lowland wet forests of Isthmian Central America. Molecular Phylogenetics and Evolution 47: 992-1004.

Woodhams, DC, VL Kilburn , LK Reinert, J Voyles , D Medina, RIbáñez, AD Hyatt, DG Boyle, JD Pask, DM Green, and LA Rollins-Smith. 2008. Chytridiomycosis and amphibian population declines continue to spread eastward in Panama. EcoHealth 5(3): 268-274.

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